chore: bump version

* names changed: pin => gpio
* ability to change OpenTherm GPIO without rebooting

README.md

@@ -2,7 +2,7 @@
    
    ![logo](/assets/logo.svg)
    <br>
-   [![GitHub version](https://img.shields.io/github/release/Laxilef/OTGateway.svg)](https://github.com/Laxilef/OTGateway/releases)
+   [![GitHub version](https://img.shields.io/github/release/Laxilef/OTGateway.svg?include_prereleases)](https://github.com/Laxilef/OTGateway/releases)
    [![GitHub download](https://img.shields.io/github/downloads/Laxilef/OTGateway/total.svg)](https://github.com/Laxilef/OTGateway/releases/latest)
    [![License](https://img.shields.io/github/license/Laxilef/OTGateway.svg)](LICENSE.txt)
    [![Telegram](https://img.shields.io/badge/Telegram-Channel-33A8E3)](https://t.me/otgateway)

data/index.html

@@ -168,11 +168,11 @@
               </tr>
               <tr>
                 <th scope="row">Pressure:</th>
-                <td><b class="ot-pressure"></b> bar</td>
+                <td><b class="ot-pressure"></b> <span class="pressure-unit"></span></td>
               </tr>
               <tr>
                 <th scope="row">DHW flow rate:</th>
-                <td><b class="ot-dhw-flow-rate"></b> l/min</td>
+                <td><b class="ot-dhw-flow-rate"></b> <span class="volume-unit"></span>/min</td>
               </tr>
               <tr>
                 <th scope="row">Fault code:</th>
@@ -180,23 +180,31 @@
               </tr>
               <tr>
                 <th scope="row">Indoor temp:</th>
-                <td><b class="indoor-temp"></b> C</td>
+                <td><b class="indoor-temp"></b> <span class="temp-unit"></span></td>
               </tr>
               <tr>
                 <th scope="row">Outdoor temp:</th>
-                <td><b class="outdoor-temp"></b> C</td>
+                <td><b class="outdoor-temp"></b> <span class="temp-unit"></span></td>
               </tr>
               <tr>
                 <th scope="row">Heating temp:</th>
-                <td><b class="heating-temp"></b> C</td>
+                <td><b class="heating-temp"></b> <span class="temp-unit"></span></td>
               </tr>
               <tr>
                 <th scope="row">Heating setpoint temp:</th>
-                <td><b class="heating-setpoint-temp"></b> C</td>
+                <td><b class="heating-setpoint-temp"></b> <span class="temp-unit"></span></td>
+              </tr>
+              <tr>
+                <th scope="row">Heating return temp:</th>
+                <td><b class="heating-return-temp"></b> <span class="temp-unit"></span></td>
               </tr>
               <tr>
                 <th scope="row">DHW temp:</th>
-                <td><b class="dhw-temp"></b> C</td>
+                <td><b class="dhw-temp"></b> <span class="temp-unit"></span></td>
+              </tr>
+              <tr>
+                <th scope="row">Exhaust temp:</th>
+                <td><b class="exhaust-temp"></b> <span class="temp-unit"></span></td>
               </tr>
             </tbody>
           </table>

data/settings.html

@@ -62,14 +62,26 @@
 
         <div id="opentherm-settings-busy" aria-busy="true"></div>
         <form action="/api/settings" id="opentherm-settings" class="hidden">
-          <div class="grid">
+          <fieldset>
-            <label for="opentherm-in-pin">
+            <legend>Unit system</legend>
-              In GPIO
+            <label>
-              <input type="number" inputmode="numeric" class="opentherm-in-pin" name="opentherm[inPin]" min="0" max="99" step="1" required>
+              <input type="radio" class="opentherm-unit-system" name="opentherm[unitSystem]" value="0" />
+              Metric (celsius)
             </label>
-            <label for="opentherm-in-pin">
+            <label>
+              <input type="radio" class="opentherm-unit-system" name="opentherm[unitSystem]" value="1" />
+              Imperial (fahrenheit)
+            </label>
+          </fieldset>
+
+          <div class="grid">
+            <label for="opentherm-in-gpio">
+              In GPIO
+              <input type="number" inputmode="numeric" class="opentherm-in-gpio" name="opentherm[inGpio]" min="0" max="254" step="1">
+            </label>
+            <label for="opentherm-in-gpio">
               Out GPIO
-              <input type="number" inputmode="numeric" class="opentherm-out-pin" name="opentherm[outPin]" min="0" max="99" step="1" required>
+              <input type="number" inputmode="numeric" class="opentherm-out-gpio" name="opentherm[outGpio]" min="0" max="254" step="1">
             </label>
             <label for="opentherm-member-id-code">
               Master MemberID code
@@ -77,10 +89,6 @@
             </label>
           </div>
 
-          <fieldset>
-            <mark>After changing GPIO, the ESP must be restarted for the changes to take effect.</mark>
-          </fieldset>
-
           <fieldset>
             <legend>Options</legend>
             <label for="opentherm-dhw-present">
@@ -111,6 +119,10 @@
               <input type="checkbox" class="opentherm-sync-modulation-with-heating" name="opentherm[modulationSyncWithHeating]" value="true">
               Sync modulation with heating
             </label>
+            <label for="opentherm-get-min-max-temp">
+              <input type="checkbox" class="opentherm-get-min-max-temp" name="opentherm[getMinMaxTemp]" value="true">
+              Get min/max temp from boiler
+            </label>
           </fieldset>
 
           <button type="submit">Save</button>
@@ -190,9 +202,9 @@
             </label>
           </fieldset>
 
-          <label for="outdoor-sensor-pin">
+          <label for="outdoor-sensor-gpio">
             GPIO
-            <input type="number" inputmode="numeric" class="outdoor-sensor-pin" name="sensors[outdoor][pin]" min="0" max="99" step="1" required>
+            <input type="number" inputmode="numeric" class="outdoor-sensor-gpio" name="sensors[outdoor][gpio]" min="0" max="254" step="1">
           </label>
           <label for="outdoor-sensor-offset">
             Temp offset (calibration)
@@ -229,9 +241,9 @@
             </label>
           </fieldset>
 
-          <label for="indoor-sensor-pin">
+          <label for="indoor-sensor-gpio">
             GPIO
-            <input type="number" inputmode="numeric" class="indoor-sensor-pin" name="sensors[indoor][pin]" min="0" max="99" step="1" required>
+            <input type="number" inputmode="numeric" class="indoor-sensor-gpio" name="sensors[indoor][gpio]" min="0" max="254" step="1">
           </label>
 
           <div class="grid">
@@ -267,9 +279,9 @@
           <br>
 
           <div class="grid">
-            <label for="extpump-pin">
+            <label for="extpump-gpio">
               Relay GPIO
-              <input type="number" inputmode="numeric" class="extpump-pin" name="externalPump[pin]" min="0" max="99" step="1" required>
+              <input type="number" inputmode="numeric" class="extpump-gpio" name="externalPump[gpio]" min="0" max="254" step="1">
             </label>
             <label for="extpump-pc-time">
               Post circulation time <small>(min)</small>
@@ -302,6 +314,18 @@
 
         <div id="system-settings-busy" aria-busy="true"></div>
         <form action="/api/settings" id="system-settings" class="hidden">
+          <fieldset>
+            <legend>Unit system</legend>
+            <label>
+              <input type="radio" class="system-unit-system" name="system[unitSystem]" value="0" />
+              Metric (celsius)
+            </label>
+            <label>
+              <input type="radio" class="system-unit-system" name="system[unitSystem]" value="1" />
+              Imperial (fahrenheit)
+            </label>
+          </fieldset>
+
           <fieldset>
             <label for="system-debug">
               <input type="checkbox" class="system-debug" name="system[debug]" value="true">

lib/CustomOpenTherm/CustomOpenTherm.h

@@ -8,6 +8,7 @@ public:
   typedef std::function<void(unsigned long, unsigned long, OpenThermResponseStatus, byte)> AfterSendRequestCallback;
 
   CustomOpenTherm(int inPin = 4, int outPin = 5, bool isSlave = false) : OpenTherm(inPin, outPin, isSlave) {}
+  ~CustomOpenTherm() {}
 
   CustomOpenTherm* setYieldCallback(YieldCallback callback = nullptr) {
     this->yieldCallback = callback;
@@ -46,7 +47,7 @@ public:
 
     unsigned long _response;
     OpenThermResponseStatus _responseStatus = OpenThermResponseStatus::NONE;
-    if (!this->sendRequestAync(request)) {
+    if (!this->sendRequestAsync(request)) {
       _response = 0;
 
     } else {
@@ -88,7 +89,7 @@ public:
       | (dhwBlocking << 6);
     data <<= 8;
 
-    return this->sendRequest(this->buildRequest(
+    return this->sendRequest(buildRequest(
       OpenThermMessageType::READ_DATA,
       OpenThermMessageID::Status,
       data
@@ -96,30 +97,30 @@ public:
   }
 
   bool setHeatingCh1Temp(float temperature) {
-    unsigned long response = this->sendRequest(this->buildRequest(
+    unsigned long response = this->sendRequest(buildRequest(
       OpenThermMessageType::WRITE_DATA,
       OpenThermMessageID::TSet,
-      this->temperatureToData(temperature)
+      temperatureToData(temperature)
     ));
 
     return isValidResponse(response);
   }
 
   bool setHeatingCh2Temp(float temperature) {
-    unsigned long response = this->sendRequest(this->buildRequest(
+    unsigned long response = this->sendRequest(buildRequest(
       OpenThermMessageType::WRITE_DATA,
       OpenThermMessageID::TsetCH2,
-      this->temperatureToData(temperature)
+      temperatureToData(temperature)
     ));
 
     return isValidResponse(response);
   }
 
   bool setDhwTemp(float temperature) {
-    unsigned long response = this->sendRequest(this->buildRequest(
+    unsigned long response = this->sendRequest(buildRequest(
       OpenThermMessageType::WRITE_DATA,
       OpenThermMessageID::TdhwSet,
-      this->temperatureToData(temperature)
+      temperatureToData(temperature)
     ));
 
     return isValidResponse(response);
@@ -128,9 +129,9 @@ public:
   bool sendBoilerReset() {
     unsigned int data = 1;
     data <<= 8;
-    unsigned long response = this->sendRequest(this->buildRequest(
+    unsigned long response = this->sendRequest(buildRequest(
       OpenThermMessageType::WRITE_DATA,
-      OpenThermMessageID::Command,
+      OpenThermMessageID::RemoteRequest,
       data
     ));
 
@@ -140,9 +141,9 @@ public:
   bool sendServiceReset() {
     unsigned int data = 10;
     data <<= 8;
-    unsigned long response = this->sendRequest(this->buildRequest(
+    unsigned long response = this->sendRequest(buildRequest(
       OpenThermMessageType::WRITE_DATA,
-      OpenThermMessageID::Command,
+      OpenThermMessageID::RemoteRequest,
       data
     ));
 
@@ -152,9 +153,9 @@ public:
   bool sendWaterFilling() {
     unsigned int data = 2;
     data <<= 8;
-    unsigned long response = this->sendRequest(this->buildRequest(
+    unsigned long response = this->sendRequest(buildRequest(
       OpenThermMessageType::WRITE_DATA,
-      OpenThermMessageID::Command,
+      OpenThermMessageID::RemoteRequest,
       data
     ));
 
@@ -162,24 +163,13 @@ public:
   }
 
   // converters
-  float fromF88(unsigned long response) {
+  template <class T>
-    const byte valueLB = response & 0xFF;
+  static unsigned int toFloat(const T val) {
-    const byte valueHB = (response >> 8) & 0xFF;
-
-    float value = (int8_t)valueHB;
-    return value + (float)valueLB / 256.0;
-  }
-
-  template <class T> unsigned int toF88(T val) {
     return (unsigned int)(val * 256);
   }
 
-  int16_t fromS16(unsigned long response) {
+  static short getInt(const unsigned long response) {
-    const byte valueLB = response & 0xFF;
+    return response & 0xffff;
-    const byte valueHB = (response >> 8) & 0xFF;
-
-    int16_t value = valueHB;
-    return ((value << 8) + valueLB);
   }
 
 protected:

lib/HomeAssistantHelper/strings.h

@@ -33,6 +33,8 @@ const char HA_AVAILABILITY_MODE[]               PROGMEM = "availability_mode";
 const char HA_TOPIC[]                           PROGMEM = "topic";
 const char HA_DEVICE_CLASS[]                    PROGMEM = "device_class";
 const char HA_UNIT_OF_MEASUREMENT[]             PROGMEM = "unit_of_measurement";
+const char HA_UNIT_OF_MEASUREMENT_C[]           PROGMEM = "°C";
+const char HA_UNIT_OF_MEASUREMENT_F[]           PROGMEM = "°F";
 const char HA_ICON[]                            PROGMEM = "icon";
 const char HA_MIN[]                             PROGMEM = "min";
 const char HA_MAX[]                             PROGMEM = "max";
@@ -50,6 +52,7 @@ const char HA_TEMPERATURE_COMMAND_TOPIC[]       PROGMEM = "temperature_command_t
 const char HA_TEMPERATURE_COMMAND_TEMPLATE[]    PROGMEM = "temperature_command_template";
 const char HA_TEMPERATURE_STATE_TOPIC[]         PROGMEM = "temperature_state_topic";
 const char HA_TEMPERATURE_STATE_TEMPLATE[]      PROGMEM = "temperature_state_template";
+const char HA_TEMPERATURE_UNIT[]                PROGMEM = "temperature_unit";
 const char HA_MODE_COMMAND_TOPIC[]              PROGMEM = "mode_command_topic";
 const char HA_MODE_COMMAND_TEMPLATE[]           PROGMEM = "mode_command_template";
 const char HA_MODE_STATE_TOPIC[]                PROGMEM = "mode_state_topic";

lib/Network/NetworkManager.h

@@ -67,7 +67,7 @@ namespace Network {
       return this;
     }
 
-    Manager* setStaticConfig(IPAddress &ip, IPAddress &gateway, IPAddress &subnet, IPAddress &dns) {
+    Manager* setStaticConfig(IPAddress& ip, IPAddress& gateway, IPAddress& subnet, IPAddress& dns) {
       this->staticIp = ip;
       this->staticGateway = gateway;
       this->staticSubnet = subnet;
@@ -181,7 +181,12 @@ namespace Network {
       wifi_station_dhcpc_set_maxtry(5);
       #endif
 
+      #ifdef ARDUINO_ARCH_ESP32
+      // Nothing. Because memory leaks when turn off WiFi on ESP32, bug?
+      return true;
+      #else
       return WiFi.mode(WIFI_OFF);
+      #endif
     }
 
     void reconnect() {

lib/WebServerHandlers/UpgradeHandler.h

@@ -174,7 +174,7 @@ public:
         Log.serrorln(
           FPSTR(L_PORTAL_OTA),
           F("File '%s', on writing %d bytes: %s"),
-          upload.filename.c_str(), upload.totalSize, result->error
+          upload.filename.c_str(), upload.totalSize, result->error.c_str()
         );
 
       } else {

platformio.ini

@@ -15,9 +15,9 @@ extra_configs = secrets.default.ini
 [env]
 framework = arduino
 lib_deps = 
-	bblanchon/ArduinoJson@^7.0.3
+	bblanchon/ArduinoJson@^7.0.4
-	;ihormelnyk/OpenTherm Library@^1.1.4
+	;ihormelnyk/OpenTherm Library@^1.1.5
-	https://github.com/Laxilef/opentherm_library/archive/refs/heads/fix_start_bit.zip
+	https://github.com/Laxilef/opentherm_library/archive/refs/heads/fix_lambda.zip
 	arduino-libraries/ArduinoMqttClient@^0.1.8
 	lennarthennigs/ESP Telnet@^2.2
 	gyverlibs/FileData@^1.0.2
@@ -30,44 +30,43 @@ build_flags =
 	-D PIO_FRAMEWORK_ARDUINO_ESPRESSIF_SDK305
 	-mtext-section-literals
 	-D MQTT_CLIENT_STD_FUNCTION_CALLBACK=1
-	;-D DEBUG_ESP_CORE -D DEBUG_ESP_WIFI -D DEBUG_ESP_PORT=Serial
+	;-D DEBUG_ESP_CORE -D DEBUG_ESP_WIFI -D DEBUG_ESP_HTTP_SERVER -D DEBUG_ESP_PORT=Serial
 	-D USE_SERIAL=${secrets.use_serial}
 	-D USE_TELNET=${secrets.use_telnet}
 	-D DEBUG_BY_DEFAULT=${secrets.debug}
-	-D HOSTNAME_DEFAULT='"${secrets.hostname}"'
+	-D DEFAULT_HOSTNAME='"${secrets.hostname}"'
-	-D AP_SSID_DEFAULT='"${secrets.ap_ssid}"'
+	-D DEFAULT_AP_SSID='"${secrets.ap_ssid}"'
-	-D AP_PASSWORD_DEFAULT='"${secrets.ap_password}"'
+	-D DEFAULT_AP_PASSWORD='"${secrets.ap_password}"'
-	-D STA_SSID_DEFAULT='"${secrets.sta_ssid}"'
+	-D DEFAULT_STA_SSID='"${secrets.sta_ssid}"'
-	-D STA_PASSWORD_DEFAULT='"${secrets.sta_password}"'
+	-D DEFAULT_STA_PASSWORD='"${secrets.sta_password}"'
-	-D PORTAL_LOGIN_DEFAULT='"${secrets.portal_login}"'
+	-D DEFAULT_PORTAL_LOGIN='"${secrets.portal_login}"'
-	-D PORTAL_PASSWORD_DEFAULT='"${secrets.portal_password}"'
+	-D DEFAULT_PORTAL_PASSWORD='"${secrets.portal_password}"'
-	-D MQTT_SERVER_DEFAULT='"${secrets.mqtt_server}"'
+	-D DEFAULT_MQTT_SERVER='"${secrets.mqtt_server}"'
-	-D MQTT_PORT_DEFAULT=${secrets.mqtt_port}
+	-D DEFAULT_MQTT_PORT=${secrets.mqtt_port}
-	-D MQTT_USER_DEFAULT='"${secrets.mqtt_user}"'
+	-D DEFAULT_MQTT_USER='"${secrets.mqtt_user}"'
-	-D MQTT_PASSWORD_DEFAULT='"${secrets.mqtt_password}"'
+	-D DEFAULT_MQTT_PASSWORD='"${secrets.mqtt_password}"'
-	-D MQTT_PREFIX_DEFAULT='"${secrets.mqtt_prefix}"'
+	-D DEFAULT_MQTT_PREFIX='"${secrets.mqtt_prefix}"'
 upload_speed = 921600
 monitor_speed = 115200
 monitor_filters = direct
 board_build.flash_mode = dio
 board_build.filesystem = littlefs
-version = 1.4.0-rc.16
+version = 1.4.0-rc.20
 
 ; Defaults
 [esp8266_defaults]
 platform = espressif8266
 lib_deps = 
 	${env.lib_deps}
-	nrwiersma/ESP8266Scheduler@^1.1
+	nrwiersma/ESP8266Scheduler@^1.2
 lib_ignore = 
 extra_scripts = 
 	post:tools/build.py
 build_flags = ${env.build_flags}
-board_build.ldscript = eagle.flash.1m256.ld
+board_build.ldscript = eagle.flash.4m1m.ld
-;board_build.ldscript = eagle.flash.4m1m.ld
 
 [esp32_defaults]
-platform = espressif32
+platform = espressif32@^6.6
 board_build.partitions = esp32_partitions.csv
 lib_deps =
 	${env.lib_deps}
@@ -91,12 +90,12 @@ extra_scripts = ${esp8266_defaults.extra_scripts}
 board_build.ldscript = ${esp8266_defaults.board_build.ldscript}
 build_flags = 
 	${esp8266_defaults.build_flags}
-	-D OT_IN_PIN_DEFAULT=4
+	-D DEFAULT_OT_IN_GPIO=4
-	-D OT_OUT_PIN_DEFAULT=5
+	-D DEFAULT_OT_OUT_GPIO=5
-	-D SENSOR_OUTDOOR_PIN_DEFAULT=12
+	-D DEFAULT_SENSOR_OUTDOOR_GPIO=12
-	-D SENSOR_INDOOR_PIN_DEFAULT=14
+	-D DEFAULT_SENSOR_INDOOR_GPIO=14
-	-D LED_STATUS_PIN=13
+	-D LED_STATUS_GPIO=13
-	-D LED_OT_RX_PIN=15
+	-D LED_OT_RX_GPIO=15
 
 [env:d1_mini_lite]
 platform = ${esp8266_defaults.platform}
@@ -107,12 +106,12 @@ extra_scripts = ${esp8266_defaults.extra_scripts}
 board_build.ldscript = ${esp8266_defaults.board_build.ldscript}
 build_flags = 
 	${esp8266_defaults.build_flags}
-	-D OT_IN_PIN_DEFAULT=4
+	-D DEFAULT_OT_IN_GPIO=4
-	-D OT_OUT_PIN_DEFAULT=5
+	-D DEFAULT_OT_OUT_GPIO=5
-	-D SENSOR_OUTDOOR_PIN_DEFAULT=12
+	-D DEFAULT_SENSOR_OUTDOOR_GPIO=12
-	-D SENSOR_INDOOR_PIN_DEFAULT=14
+	-D DEFAULT_SENSOR_INDOOR_GPIO=14
-	-D LED_STATUS_PIN=13
+	-D LED_STATUS_GPIO=13
-	-D LED_OT_RX_PIN=15
+	-D LED_OT_RX_GPIO=15
 
 [env:d1_mini_pro]
 platform = ${esp8266_defaults.platform}
@@ -123,12 +122,12 @@ extra_scripts = ${esp8266_defaults.extra_scripts}
 board_build.ldscript = ${esp8266_defaults.board_build.ldscript}
 build_flags = 
 	${esp8266_defaults.build_flags}
-	-D OT_IN_PIN_DEFAULT=4
+	-D DEFAULT_OT_IN_GPIO=4
-	-D OT_OUT_PIN_DEFAULT=5
+	-D DEFAULT_OT_OUT_GPIO=5
-	-D SENSOR_OUTDOOR_PIN_DEFAULT=12
+	-D DEFAULT_SENSOR_OUTDOOR_GPIO=12
-	-D SENSOR_INDOOR_PIN_DEFAULT=14
+	-D DEFAULT_SENSOR_INDOOR_GPIO=14
-	-D LED_STATUS_PIN=13
+	-D LED_STATUS_GPIO=13
-	-D LED_OT_RX_PIN=15
+	-D LED_OT_RX_GPIO=15
 
 [env:s2_mini]
 platform = ${esp32_defaults.platform}
@@ -139,12 +138,12 @@ lib_ignore = ${esp32_defaults.lib_ignore}
 extra_scripts = ${esp32_defaults.extra_scripts}
 build_flags = 
 	${esp32_defaults.build_flags}
-	-D OT_IN_PIN_DEFAULT=33
+	-D DEFAULT_OT_IN_GPIO=33
-	-D OT_OUT_PIN_DEFAULT=35
+	-D DEFAULT_OT_OUT_GPIO=35
-	-D SENSOR_OUTDOOR_PIN_DEFAULT=9
+	-D DEFAULT_SENSOR_OUTDOOR_GPIO=9
-	-D SENSOR_INDOOR_PIN_DEFAULT=7
+	-D DEFAULT_SENSOR_INDOOR_GPIO=7
-	-D LED_STATUS_PIN=11
+	-D LED_STATUS_GPIO=11
-	-D LED_OT_RX_PIN=12
+	-D LED_OT_RX_GPIO=12
 
 [env:s3_mini] 
 platform = ${esp32_defaults.platform}
@@ -158,12 +157,12 @@ extra_scripts = ${esp32_defaults.extra_scripts}
 build_flags = 
 	${esp32_defaults.build_flags}
 	-D USE_BLE=1
-	-D OT_IN_PIN_DEFAULT=35
+	-D DEFAULT_OT_IN_GPIO=35
-	-D OT_OUT_PIN_DEFAULT=36
+	-D DEFAULT_OT_OUT_GPIO=36
-	-D SENSOR_OUTDOOR_PIN_DEFAULT=13
+	-D DEFAULT_SENSOR_OUTDOOR_GPIO=13
-	-D SENSOR_INDOOR_PIN_DEFAULT=12
+	-D DEFAULT_SENSOR_INDOOR_GPIO=12
-	-D LED_STATUS_PIN=11
+	-D LED_STATUS_GPIO=11
-	-D LED_OT_RX_PIN=10
+	-D LED_OT_RX_GPIO=10
 
 [env:c3_mini] 
 platform = ${esp32_defaults.platform}
@@ -179,12 +178,12 @@ build_unflags =
 build_flags = 
 	${esp32_defaults.build_flags}
 	-D USE_BLE=1
-	-D OT_IN_PIN_DEFAULT=8
+	-D DEFAULT_OT_IN_GPIO=8
-	-D OT_OUT_PIN_DEFAULT=10
+	-D DEFAULT_OT_OUT_GPIO=10
-	-D SENSOR_OUTDOOR_PIN_DEFAULT=0
+	-D DEFAULT_SENSOR_OUTDOOR_GPIO=0
-	-D SENSOR_INDOOR_PIN_DEFAULT=1
+	-D DEFAULT_SENSOR_INDOOR_GPIO=1
-	-D LED_STATUS_PIN=4
+	-D LED_STATUS_GPIO=4
-	-D LED_OT_RX_PIN=5
+	-D LED_OT_RX_GPIO=5
 
 [env:nodemcu_32s]
 platform = ${esp32_defaults.platform}
@@ -198,12 +197,12 @@ extra_scripts = ${esp32_defaults.extra_scripts}
 build_flags = 
 	${esp32_defaults.build_flags}
 	-D USE_BLE=1
-	-D OT_IN_PIN_DEFAULT=21
+	-D DEFAULT_OT_IN_GPIO=21
-	-D OT_OUT_PIN_DEFAULT=22
+	-D DEFAULT_OT_OUT_GPIO=22
-	-D SENSOR_OUTDOOR_PIN_DEFAULT=12
+	-D DEFAULT_SENSOR_OUTDOOR_GPIO=12
-	-D SENSOR_INDOOR_PIN_DEFAULT=13
+	-D DEFAULT_SENSOR_INDOOR_GPIO=13
-	-D LED_STATUS_PIN=2 ; 18
+	-D LED_STATUS_GPIO=2 ; 18
-	-D LED_OT_RX_PIN=19
+	-D LED_OT_RX_GPIO=19
 	;-D WOKWI=1
 
 [env:d1_mini32]
@@ -218,9 +217,9 @@ extra_scripts = ${esp32_defaults.extra_scripts}
 build_flags = 
 	${esp32_defaults.build_flags}
 	-D USE_BLE=1
-	-D OT_IN_PIN_DEFAULT=21
+	-D DEFAULT_OT_IN_GPIO=21
-	-D OT_OUT_PIN_DEFAULT=22
+	-D DEFAULT_OT_OUT_GPIO=22
-	-D SENSOR_OUTDOOR_PIN_DEFAULT=12
+	-D DEFAULT_SENSOR_OUTDOOR_GPIO=12
-	-D SENSOR_INDOOR_PIN_DEFAULT=18
+	-D DEFAULT_SENSOR_INDOOR_GPIO=18
-	-D LED_STATUS_PIN=2
+	-D LED_STATUS_GPIO=2
-	-D LED_OT_RX_PIN=19
+	-D LED_OT_RX_GPIO=19

src/HaHelper.h

@@ -27,22 +27,31 @@ public:
     return this->publish(this->getTopic(FPSTR(HA_ENTITY_SWITCH), F("emergency")).c_str(), doc);
   }
 
-  bool publishNumberEmergencyTarget(bool enabledByDefault = true) {
+  bool publishNumberEmergencyTarget(UnitSystem unit = UnitSystem::METRIC, bool enabledByDefault = true) {
     JsonDocument doc;
     doc[FPSTR(HA_ENABLED_BY_DEFAULT)] = enabledByDefault;
     doc[FPSTR(HA_UNIQUE_ID)] = this->getObjectId(F("emergency_target"));
     doc[FPSTR(HA_OBJECT_ID)] = this->getObjectId(F("emergency_target"));
     doc[FPSTR(HA_ENTITY_CATEGORY)] = F("config");
     doc[FPSTR(HA_DEVICE_CLASS)] = F("temperature");
-    doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = F("°C");
+
+    if (unit == UnitSystem::METRIC) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_C);
+      doc[FPSTR(HA_MIN)] = 5;
+      doc[FPSTR(HA_MAX)] = 50;
+
+    } else if (unit == UnitSystem::IMPERIAL) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_F);
+      doc[FPSTR(HA_MIN)] = 41;
+      doc[FPSTR(HA_MAX)] = 122;
+    }
+    
     doc[FPSTR(HA_NAME)] = F("Emergency target temp");
     doc[FPSTR(HA_ICON)] = F("mdi:thermometer-alert");
     doc[FPSTR(HA_STATE_TOPIC)] = this->getDeviceTopic(F("settings"));
     doc[FPSTR(HA_VALUE_TEMPLATE)] = F("{{ value_json.emergency.target|float(0)|round(1) }}");
     doc[FPSTR(HA_COMMAND_TOPIC)] = this->getDeviceTopic(F("settings/set"));
     doc[FPSTR(HA_COMMAND_TEMPLATE)] = F("{\"emergency\": {\"target\" : {{ value }}}}");
-    doc[FPSTR(HA_MIN)] = 5;
-    doc[FPSTR(HA_MAX)] = 50;
     doc[FPSTR(HA_STEP)] = 0.5;
     doc[FPSTR(HA_MODE)] = "box";
     doc[FPSTR(HA_EXPIRE_AFTER)] = 120;
@@ -142,7 +151,7 @@ public:
     return this->publish(this->getTopic(FPSTR(HA_ENTITY_SWITCH), F("heating_turbo")).c_str(), doc);
   }
 
-  bool publishNumberHeatingTarget(byte minTemp = 20, byte maxTemp = 90, bool enabledByDefault = true) {
+  bool publishNumberHeatingTarget(UnitSystem unit = UnitSystem::METRIC, byte minTemp = 20, byte maxTemp = 90, bool enabledByDefault = true) {
     JsonDocument doc;
     doc[FPSTR(HA_AVAILABILITY)][FPSTR(HA_TOPIC)] = this->getDeviceTopic(F("status"));
     doc[FPSTR(HA_ENABLED_BY_DEFAULT)] = enabledByDefault;
@@ -150,7 +159,14 @@ public:
     doc[FPSTR(HA_OBJECT_ID)] = this->getObjectId(F("heating_target"));
     doc[FPSTR(HA_ENTITY_CATEGORY)] = F("config");
     doc[FPSTR(HA_DEVICE_CLASS)] = F("temperature");
-    doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = F("°C");
+
+    if (unit == UnitSystem::METRIC) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_C);
+      
+    } else if (unit == UnitSystem::IMPERIAL) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_F);
+    }
+
     doc[FPSTR(HA_NAME)] = F("Heating target");
     doc[FPSTR(HA_ICON)] = F("mdi:radiator");
     doc[FPSTR(HA_STATE_TOPIC)] = this->getDeviceTopic(F("settings"));
@@ -167,14 +183,21 @@ public:
     return this->publish(this->getTopic(FPSTR(HA_ENTITY_NUMBER), F("heating_target")).c_str(), doc);
   }
 
-  bool publishNumberHeatingHysteresis(bool enabledByDefault = true) {
+  bool publishNumberHeatingHysteresis(UnitSystem unit = UnitSystem::METRIC, bool enabledByDefault = true) {
     JsonDocument doc;
     doc[FPSTR(HA_ENABLED_BY_DEFAULT)] = enabledByDefault;
     doc[FPSTR(HA_UNIQUE_ID)] = this->getObjectId(F("heating_hysteresis"));
     doc[FPSTR(HA_OBJECT_ID)] = this->getObjectId(F("heating_hysteresis"));
     doc[FPSTR(HA_ENTITY_CATEGORY)] = F("config");
     doc[FPSTR(HA_DEVICE_CLASS)] = F("temperature");
-    doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = F("°C");
+
+    if (unit == UnitSystem::METRIC) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_C);
+      
+    } else if (unit == UnitSystem::IMPERIAL) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_F);
+    }
+
     doc[FPSTR(HA_NAME)] = F("Heating hysteresis");
     doc[FPSTR(HA_ICON)] = F("mdi:altimeter");
     doc[FPSTR(HA_STATE_TOPIC)] = this->getDeviceTopic(F("settings"));
@@ -191,7 +214,7 @@ public:
     return this->publish(this->getTopic(FPSTR(HA_ENTITY_NUMBER), F("heating_hysteresis")).c_str(), doc);
   }
 
-  bool publishSensorHeatingSetpoint(bool enabledByDefault = true) {
+  bool publishSensorHeatingSetpoint(UnitSystem unit = UnitSystem::METRIC, bool enabledByDefault = true) {
     JsonDocument doc;
     doc[FPSTR(HA_AVAILABILITY)][FPSTR(HA_TOPIC)] = this->getDeviceTopic(F("status"));
     doc[FPSTR(HA_ENABLED_BY_DEFAULT)] = enabledByDefault;
@@ -200,7 +223,14 @@ public:
     doc[FPSTR(HA_ENTITY_CATEGORY)] = F("diagnostic");
     doc[FPSTR(HA_DEVICE_CLASS)] = F("temperature");
     doc[FPSTR(HA_STATE_CLASS)] = F("measurement");
-    doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = F("°C");
+
+    if (unit == UnitSystem::METRIC) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_C);
+      
+    } else if (unit == UnitSystem::IMPERIAL) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_F);
+    }
+
     doc[FPSTR(HA_NAME)] = F("Heating setpoint");
     doc[FPSTR(HA_ICON)] = F("mdi:coolant-temperature");
     doc[FPSTR(HA_STATE_TOPIC)] = this->getDeviceTopic(F("state"));
@@ -211,7 +241,7 @@ public:
     return this->publish(this->getTopic(FPSTR(HA_ENTITY_SENSOR), F("heating_setpoint")).c_str(), doc);
   }
 
-  bool publishSensorBoilerHeatingMinTemp(bool enabledByDefault = true) {
+  bool publishSensorBoilerHeatingMinTemp(UnitSystem unit = UnitSystem::METRIC, bool enabledByDefault = true) {
     JsonDocument doc;
     doc[FPSTR(HA_AVAILABILITY)][0][FPSTR(HA_TOPIC)] = this->getDeviceTopic(F("status"));
     doc[FPSTR(HA_AVAILABILITY)][1][FPSTR(HA_TOPIC)] = this->getDeviceTopic(F("state"));
@@ -223,7 +253,14 @@ public:
     doc[FPSTR(HA_ENTITY_CATEGORY)] = F("diagnostic");
     doc[FPSTR(HA_DEVICE_CLASS)] = F("temperature");
     doc[FPSTR(HA_STATE_CLASS)] = F("measurement");
-    doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = F("°C");
+
+    if (unit == UnitSystem::METRIC) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_C);
+      
+    } else if (unit == UnitSystem::IMPERIAL) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_F);
+    }
+
     doc[FPSTR(HA_NAME)] = F("Boiler heating min temp");
     doc[FPSTR(HA_ICON)] = F("mdi:thermometer-chevron-down");
     doc[FPSTR(HA_STATE_TOPIC)] = this->getDeviceTopic(F("state"));
@@ -234,7 +271,7 @@ public:
     return this->publish(this->getTopic(FPSTR(HA_ENTITY_SENSOR), F("boiler_heating_min_temp")).c_str(), doc);
   }
 
-  bool publishSensorBoilerHeatingMaxTemp(bool enabledByDefault = true) {
+  bool publishSensorBoilerHeatingMaxTemp(UnitSystem unit = UnitSystem::METRIC, bool enabledByDefault = true) {
     JsonDocument doc;
     doc[FPSTR(HA_AVAILABILITY)][0][FPSTR(HA_TOPIC)] = this->getDeviceTopic(F("status"));
     doc[FPSTR(HA_AVAILABILITY)][1][FPSTR(HA_TOPIC)] = this->getDeviceTopic(F("state"));
@@ -246,7 +283,14 @@ public:
     doc[FPSTR(HA_ENTITY_CATEGORY)] = F("diagnostic");
     doc[FPSTR(HA_DEVICE_CLASS)] = F("temperature");
     doc[FPSTR(HA_STATE_CLASS)] = F("measurement");
-    doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = F("°C");
+
+    if (unit == UnitSystem::METRIC) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_C);
+      
+    } else if (unit == UnitSystem::IMPERIAL) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_F);
+    }
+
     doc[FPSTR(HA_NAME)] = F("Boiler heating max temp");
     doc[FPSTR(HA_ICON)] = F("mdi:thermometer-chevron-up");
     doc[FPSTR(HA_STATE_TOPIC)] = this->getDeviceTopic(F("state"));
@@ -257,22 +301,31 @@ public:
     return this->publish(this->getTopic(FPSTR(HA_ENTITY_SENSOR), F("boiler_heating_max_temp")).c_str(), doc);
   }
 
-  bool publishNumberHeatingMinTemp(bool enabledByDefault = true) {
+  bool publishNumberHeatingMinTemp(UnitSystem unit = UnitSystem::METRIC, bool enabledByDefault = true) {
     JsonDocument doc;
     doc[FPSTR(HA_ENABLED_BY_DEFAULT)] = enabledByDefault;
     doc[FPSTR(HA_UNIQUE_ID)] = this->getObjectId(F("heating_min_temp"));
     doc[FPSTR(HA_OBJECT_ID)] = this->getObjectId(F("heating_min_temp"));
     doc[FPSTR(HA_ENTITY_CATEGORY)] = F("config");
     doc[FPSTR(HA_DEVICE_CLASS)] = F("temperature");
-    doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = F("°C");
+
+    if (unit == UnitSystem::METRIC) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_C);
+      doc[FPSTR(HA_MIN)] = 0;
+      doc[FPSTR(HA_MAX)] = 99;
+      
+    } else if (unit == UnitSystem::IMPERIAL) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_F);
+      doc[FPSTR(HA_MIN)] = 32;
+      doc[FPSTR(HA_MAX)] = 211;
+    }
+
     doc[FPSTR(HA_NAME)] = F("Heating min temp");
     doc[FPSTR(HA_ICON)] = F("mdi:thermometer-chevron-down");
     doc[FPSTR(HA_STATE_TOPIC)] = this->getDeviceTopic(F("settings"));
     doc[FPSTR(HA_VALUE_TEMPLATE)] = F("{{ value_json.heating.minTemp|float(0)|round(1) }}");
     doc[FPSTR(HA_COMMAND_TOPIC)] = this->getDeviceTopic(F("settings/set"));
     doc[FPSTR(HA_COMMAND_TEMPLATE)] = F("{\"heating\": {\"minTemp\" : {{ value }}}}");
-    doc[FPSTR(HA_MIN)] = 0;
-    doc[FPSTR(HA_MAX)] = 99;
     doc[FPSTR(HA_STEP)] = 1;
     doc[FPSTR(HA_MODE)] = "box";
     doc[FPSTR(HA_EXPIRE_AFTER)] = 120;
@@ -281,22 +334,31 @@ public:
     return this->publish(this->getTopic(FPSTR(HA_ENTITY_NUMBER), F("heating_min_temp")).c_str(), doc);
   }
 
-  bool publishNumberHeatingMaxTemp(bool enabledByDefault = true) {
+  bool publishNumberHeatingMaxTemp(UnitSystem unit = UnitSystem::METRIC, bool enabledByDefault = true) {
     JsonDocument doc;
     doc[FPSTR(HA_ENABLED_BY_DEFAULT)] = enabledByDefault;
     doc[FPSTR(HA_UNIQUE_ID)] = this->getObjectId(F("heating_max_temp"));
     doc[FPSTR(HA_OBJECT_ID)] = this->getObjectId(F("heating_max_temp"));
     doc[FPSTR(HA_ENTITY_CATEGORY)] = F("config");
     doc[FPSTR(HA_DEVICE_CLASS)] = F("temperature");
-    doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = F("°C");
+
+    if (unit == UnitSystem::METRIC) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_C);
+      doc[FPSTR(HA_MIN)] = 1;
+      doc[FPSTR(HA_MAX)] = 100;
+      
+    } else if (unit == UnitSystem::IMPERIAL) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_F);
+      doc[FPSTR(HA_MIN)] = 33;
+      doc[FPSTR(HA_MAX)] = 212;
+    }
+
     doc[FPSTR(HA_NAME)] = F("Heating max temp");
     doc[FPSTR(HA_ICON)] = F("mdi:thermometer-chevron-up");
     doc[FPSTR(HA_STATE_TOPIC)] = this->getDeviceTopic(F("settings"));
     doc[FPSTR(HA_VALUE_TEMPLATE)] = F("{{ value_json.heating.maxTemp|float(0)|round(1) }}");
     doc[FPSTR(HA_COMMAND_TOPIC)] = this->getDeviceTopic(F("settings/set"));
     doc[FPSTR(HA_COMMAND_TEMPLATE)] = F("{\"heating\": {\"maxTemp\" : {{ value }}}}");
-    doc[FPSTR(HA_MIN)] = 1;
-    doc[FPSTR(HA_MAX)] = 100;
     doc[FPSTR(HA_STEP)] = 1;
     doc[FPSTR(HA_MODE)] = "box";
     doc[FPSTR(HA_EXPIRE_AFTER)] = 120;
@@ -352,7 +414,7 @@ public:
     return this->publish(this->getTopic(FPSTR(HA_ENTITY_SWITCH), F("dhw")).c_str(), doc);
   }
 
-  bool publishNumberDhwTarget(byte minTemp = 40, byte maxTemp = 60, bool enabledByDefault = true) {
+  bool publishNumberDhwTarget(UnitSystem unit = UnitSystem::METRIC, byte minTemp = 40, byte maxTemp = 60, bool enabledByDefault = true) {
     JsonDocument doc;
     doc[FPSTR(HA_AVAILABILITY)][FPSTR(HA_TOPIC)] = this->getDeviceTopic(F("status"));
     doc[FPSTR(HA_ENABLED_BY_DEFAULT)] = enabledByDefault;
@@ -360,7 +422,14 @@ public:
     doc[FPSTR(HA_OBJECT_ID)] = this->getObjectId(F("dhw_target"));
     doc[FPSTR(HA_ENTITY_CATEGORY)] = F("config");
     doc[FPSTR(HA_DEVICE_CLASS)] = F("temperature");
-    doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = F("°C");
+
+    if (unit == UnitSystem::METRIC) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_C);
+      
+    } else if (unit == UnitSystem::IMPERIAL) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_F);
+    }
+
     doc[FPSTR(HA_NAME)] = F("DHW target");
     doc[FPSTR(HA_ICON)] = F("mdi:water-pump");
     doc[FPSTR(HA_STATE_TOPIC)] = this->getDeviceTopic(F("settings"));
@@ -377,7 +446,7 @@ public:
     return this->publish(this->getTopic(FPSTR(HA_ENTITY_NUMBER), F("dhw_target")).c_str(), doc);
   }
 
-  bool publishSensorBoilerDhwMinTemp(bool enabledByDefault = true) {
+  bool publishSensorBoilerDhwMinTemp(UnitSystem unit = UnitSystem::METRIC, bool enabledByDefault = true) {
     JsonDocument doc;
     doc[FPSTR(HA_AVAILABILITY)][0][FPSTR(HA_TOPIC)] = this->getDeviceTopic(F("status"));
     doc[FPSTR(HA_AVAILABILITY)][1][FPSTR(HA_TOPIC)] = this->getDeviceTopic(F("state"));
@@ -389,7 +458,14 @@ public:
     doc[FPSTR(HA_ENTITY_CATEGORY)] = F("diagnostic");
     doc[FPSTR(HA_DEVICE_CLASS)] = F("temperature");
     doc[FPSTR(HA_STATE_CLASS)] = F("measurement");
-    doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = F("°C");
+
+    if (unit == UnitSystem::METRIC) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_C);
+      
+    } else if (unit == UnitSystem::IMPERIAL) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_F);
+    }
+
     doc[FPSTR(HA_NAME)] = F("Boiler DHW min temp");
     doc[FPSTR(HA_ICON)] = F("mdi:thermometer-chevron-down");
     doc[FPSTR(HA_STATE_TOPIC)] = this->getDeviceTopic(F("state"));
@@ -400,7 +476,7 @@ public:
     return this->publish(this->getTopic(FPSTR(HA_ENTITY_SENSOR), F("boiler_dhw_min_temp")).c_str(), doc);
   }
 
-  bool publishSensorBoilerDhwMaxTemp(bool enabledByDefault = true) {
+  bool publishSensorBoilerDhwMaxTemp(UnitSystem unit = UnitSystem::METRIC, bool enabledByDefault = true) {
     JsonDocument doc;
     doc[FPSTR(HA_AVAILABILITY)][0][FPSTR(HA_TOPIC)] = this->getDeviceTopic(F("status"));
     doc[FPSTR(HA_AVAILABILITY)][1][FPSTR(HA_TOPIC)] = this->getDeviceTopic(F("state"));
@@ -412,7 +488,14 @@ public:
     doc[FPSTR(HA_ENTITY_CATEGORY)] = F("diagnostic");
     doc[FPSTR(HA_DEVICE_CLASS)] = F("temperature");
     doc[FPSTR(HA_STATE_CLASS)] = F("measurement");
-    doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = F("°C");
+
+    if (unit == UnitSystem::METRIC) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_C);
+      
+    } else if (unit == UnitSystem::IMPERIAL) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_F);
+    }
+
     doc[FPSTR(HA_NAME)] = F("Boiler DHW max temp");
     doc[FPSTR(HA_ICON)] = F("mdi:thermometer-chevron-up");
     doc[FPSTR(HA_STATE_TOPIC)] = this->getDeviceTopic(F("state"));
@@ -423,22 +506,31 @@ public:
     return this->publish(this->getTopic(FPSTR(HA_ENTITY_SENSOR), F("boiler_dhw_max_temp")).c_str(), doc);
   }
 
-  bool publishNumberDhwMinTemp(bool enabledByDefault = true) {
+  bool publishNumberDhwMinTemp(UnitSystem unit = UnitSystem::METRIC, bool enabledByDefault = true) {
     JsonDocument doc;
     doc[FPSTR(HA_ENABLED_BY_DEFAULT)] = enabledByDefault;
     doc[FPSTR(HA_UNIQUE_ID)] = this->getObjectId(F("dhw_min_temp"));
     doc[FPSTR(HA_OBJECT_ID)] = this->getObjectId(F("dhw_min_temp"));
     doc[FPSTR(HA_ENTITY_CATEGORY)] = F("config");
     doc[FPSTR(HA_DEVICE_CLASS)] = F("temperature");
-    doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = F("°C");
+
+    if (unit == UnitSystem::METRIC) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_C);
+      doc[FPSTR(HA_MIN)] = 0;
+      doc[FPSTR(HA_MAX)] = 99;
+      
+    } else if (unit == UnitSystem::IMPERIAL) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_F);
+      doc[FPSTR(HA_MIN)] = 32;
+      doc[FPSTR(HA_MAX)] = 211;
+    }
+
     doc[FPSTR(HA_NAME)] = F("DHW min temp");
     doc[FPSTR(HA_ICON)] = F("mdi:thermometer-chevron-down");
     doc[FPSTR(HA_STATE_TOPIC)] = this->getDeviceTopic(F("settings"));
     doc[FPSTR(HA_VALUE_TEMPLATE)] = F("{{ value_json.dhw.minTemp|float(0)|round(1) }}");
     doc[FPSTR(HA_COMMAND_TOPIC)] = this->getDeviceTopic(F("settings/set"));
     doc[FPSTR(HA_COMMAND_TEMPLATE)] = F("{\"dhw\": {\"minTemp\" : {{ value }}}}");
-    doc[FPSTR(HA_MIN)] = 0;
-    doc[FPSTR(HA_MAX)] = 99;
     doc[FPSTR(HA_STEP)] = 1;
     doc[FPSTR(HA_MODE)] = "box";
     doc[FPSTR(HA_EXPIRE_AFTER)] = 120;
@@ -447,22 +539,31 @@ public:
     return this->publish(this->getTopic(FPSTR(HA_ENTITY_NUMBER), F("dhw_min_temp")).c_str(), doc);
   }
 
-  bool publishNumberDhwMaxTemp(bool enabledByDefault = true) {
+  bool publishNumberDhwMaxTemp(UnitSystem unit = UnitSystem::METRIC, bool enabledByDefault = true) {
     JsonDocument doc;
     doc[FPSTR(HA_ENABLED_BY_DEFAULT)] = enabledByDefault;
     doc[FPSTR(HA_UNIQUE_ID)] = this->getObjectId(F("dhw_max_temp"));
     doc[FPSTR(HA_OBJECT_ID)] = this->getObjectId(F("dhw_max_temp"));
     doc[FPSTR(HA_ENTITY_CATEGORY)] = F("config");
     doc[FPSTR(HA_DEVICE_CLASS)] = F("temperature");
-    doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = F("°C");
+
+    if (unit == UnitSystem::METRIC) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_C);
+      doc[FPSTR(HA_MIN)] = 1;
+      doc[FPSTR(HA_MAX)] = 100;
+      
+    } else if (unit == UnitSystem::IMPERIAL) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_F);
+      doc[FPSTR(HA_MIN)] = 33;
+      doc[FPSTR(HA_MAX)] = 212;
+    }
+
     doc[FPSTR(HA_NAME)] = F("DHW max temp");
     doc[FPSTR(HA_ICON)] = F("mdi:thermometer-chevron-up");
     doc[FPSTR(HA_STATE_TOPIC)] = this->getDeviceTopic(F("settings"));
     doc[FPSTR(HA_VALUE_TEMPLATE)] = F("{{ value_json.dhw.maxTemp|float(0)|round(1) }}");
     doc[FPSTR(HA_COMMAND_TOPIC)] = this->getDeviceTopic(F("settings/set"));
     doc[FPSTR(HA_COMMAND_TEMPLATE)] = F("{\"dhw\": {\"maxTemp\" : {{ value }}}}");
-    doc[FPSTR(HA_MIN)] = 1;
-    doc[FPSTR(HA_MAX)] = 100;
     doc[FPSTR(HA_STEP)] = 1;
     doc[FPSTR(HA_MODE)] = "box";
     doc[FPSTR(HA_EXPIRE_AFTER)] = 120;
@@ -579,22 +680,31 @@ public:
     return this->publish(this->getTopic(FPSTR(HA_ENTITY_NUMBER), F("pid_dt")).c_str(), doc);
   }
 
-  bool publishNumberPidMinTemp(bool enabledByDefault = true) {
+  bool publishNumberPidMinTemp(UnitSystem unit = UnitSystem::METRIC, bool enabledByDefault = true) {
     JsonDocument doc;
     doc[FPSTR(HA_ENABLED_BY_DEFAULT)] = enabledByDefault;
     doc[FPSTR(HA_UNIQUE_ID)] = this->getObjectId(F("pid_min_temp"));
     doc[FPSTR(HA_OBJECT_ID)] = this->getObjectId(F("pid_min_temp"));
     doc[FPSTR(HA_ENTITY_CATEGORY)] = F("config");
     doc[FPSTR(HA_DEVICE_CLASS)] = F("temperature");
-    doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = F("°C");
+
+    if (unit == UnitSystem::METRIC) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_C);
+      doc[FPSTR(HA_MIN)] = 0;
+      doc[FPSTR(HA_MAX)] = 99;
+      
+    } else if (unit == UnitSystem::IMPERIAL) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_F);
+      doc[FPSTR(HA_MIN)] = 0;
+      doc[FPSTR(HA_MAX)] = 211;
+    }
+
     doc[FPSTR(HA_NAME)] = F("PID min temp");
     doc[FPSTR(HA_ICON)] = F("mdi:thermometer-chevron-down");
     doc[FPSTR(HA_STATE_TOPIC)] = this->getDeviceTopic(F("settings"));
     doc[FPSTR(HA_VALUE_TEMPLATE)] = F("{{ value_json.pid.minTemp|float(0)|round(1) }}");
     doc[FPSTR(HA_COMMAND_TOPIC)] = this->getDeviceTopic(F("settings/set"));
     doc[FPSTR(HA_COMMAND_TEMPLATE)] = F("{\"pid\": {\"minTemp\" : {{ value }}}}");
-    doc[FPSTR(HA_MIN)] = 0;
-    doc[FPSTR(HA_MAX)] = 99;
     doc[FPSTR(HA_STEP)] = 1;
     doc[FPSTR(HA_MODE)] = "box";
     doc[FPSTR(HA_EXPIRE_AFTER)] = 120;
@@ -603,22 +713,31 @@ public:
     return this->publish(this->getTopic(FPSTR(HA_ENTITY_NUMBER), F("pid_min_temp")).c_str(), doc);
   }
 
-  bool publishNumberPidMaxTemp(bool enabledByDefault = true) {
+  bool publishNumberPidMaxTemp(UnitSystem unit = UnitSystem::METRIC, bool enabledByDefault = true) {
     JsonDocument doc;
     doc[FPSTR(HA_ENABLED_BY_DEFAULT)] = enabledByDefault;
     doc[FPSTR(HA_UNIQUE_ID)] = this->getObjectId(F("pid_max_temp"));
     doc[FPSTR(HA_OBJECT_ID)] = this->getObjectId(F("pid_max_temp"));
     doc[FPSTR(HA_ENTITY_CATEGORY)] = F("config");
     doc[FPSTR(HA_DEVICE_CLASS)] = F("temperature");
-    doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = F("°C");
+
+    if (unit == UnitSystem::METRIC) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_C);
+    doc[FPSTR(HA_MIN)] = 1;
+    doc[FPSTR(HA_MAX)] = 100;
+      
+    } else if (unit == UnitSystem::IMPERIAL) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_F);
+      doc[FPSTR(HA_MIN)] = 1;
+      doc[FPSTR(HA_MAX)] = 212;
+    }
+
     doc[FPSTR(HA_NAME)] = F("PID max temp");
     doc[FPSTR(HA_ICON)] = F("mdi:thermometer-chevron-up");
     doc[FPSTR(HA_STATE_TOPIC)] = this->getDeviceTopic(F("settings"));
     doc[FPSTR(HA_VALUE_TEMPLATE)] = F("{{ value_json.pid.maxTemp|float(0)|round(1) }}");
     doc[FPSTR(HA_COMMAND_TOPIC)] = this->getDeviceTopic(F("settings/set"));
     doc[FPSTR(HA_COMMAND_TEMPLATE)] = F("{\"pid\": {\"maxTemp\" : {{ value }}}}");
-    doc[FPSTR(HA_MIN)] = 1;
-    doc[FPSTR(HA_MAX)] = 100;
     doc[FPSTR(HA_STEP)] = 1;
     doc[FPSTR(HA_MODE)] = "box";
     doc[FPSTR(HA_EXPIRE_AFTER)] = 120;
@@ -980,7 +1099,7 @@ public:
     return this->publish(this->getTopic(FPSTR(HA_ENTITY_SENSOR), F("modulation")).c_str(), doc);
   }
 
-  bool publishSensorPressure(bool enabledByDefault = true) {
+  bool publishSensorPressure(UnitSystem unit = UnitSystem::METRIC, bool enabledByDefault = true) {
     JsonDocument doc;
     doc[FPSTR(HA_AVAILABILITY)][0][FPSTR(HA_TOPIC)] = this->getDeviceTopic(F("status"));
     doc[FPSTR(HA_AVAILABILITY)][1][FPSTR(HA_TOPIC)] = this->getDeviceTopic(F("state"));
@@ -992,7 +1111,14 @@ public:
     doc[FPSTR(HA_ENTITY_CATEGORY)] = F("diagnostic");
     doc[FPSTR(HA_DEVICE_CLASS)] = F("pressure");
     doc[FPSTR(HA_STATE_CLASS)] = F("measurement");
-    doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = F("bar");
+
+    if (unit == UnitSystem::METRIC) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = F("bar");
+
+    } else if (unit == UnitSystem::IMPERIAL) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = F("psi");
+    }
+
     doc[FPSTR(HA_NAME)] = F("Pressure");
     doc[FPSTR(HA_ICON)] = F("mdi:gauge");
     doc[FPSTR(HA_STATE_TOPIC)] = this->getDeviceTopic(F("state"));
@@ -1003,7 +1129,7 @@ public:
     return this->publish(this->getTopic(FPSTR(HA_ENTITY_SENSOR), F("pressure")).c_str(), doc);
   }
 
-  bool publishSensorDhwFlowRate(bool enabledByDefault = true) {
+  bool publishSensorDhwFlowRate(UnitSystem unit = UnitSystem::METRIC, bool enabledByDefault = true) {
     JsonDocument doc;
     doc[FPSTR(HA_AVAILABILITY)][0][FPSTR(HA_TOPIC)] = this->getDeviceTopic(F("status"));
     doc[FPSTR(HA_AVAILABILITY)][1][FPSTR(HA_TOPIC)] = this->getDeviceTopic(F("state"));
@@ -1015,7 +1141,14 @@ public:
     doc[FPSTR(HA_ENTITY_CATEGORY)] = F("diagnostic");
     doc[FPSTR(HA_DEVICE_CLASS)] = F("volume_flow_rate");
     doc[FPSTR(HA_STATE_CLASS)] = F("measurement");
-    doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = F("L/min");
+
+    if (unit == UnitSystem::METRIC) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = F("L/min");
+
+    } else if (unit == UnitSystem::IMPERIAL) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = F("gal/min");
+    }
+
     doc[FPSTR(HA_NAME)] = F("DHW flow rate");
     doc[FPSTR(HA_ICON)] = F("mdi:water-pump");
     doc[FPSTR(HA_STATE_TOPIC)] = this->getDeviceTopic(F("state"));
@@ -1027,21 +1160,30 @@ public:
   }
 
 
-  bool publishNumberIndoorTemp(bool enabledByDefault = true) {
+  bool publishNumberIndoorTemp(UnitSystem unit = UnitSystem::METRIC, bool enabledByDefault = true) {
     JsonDocument doc;
     doc[FPSTR(HA_ENABLED_BY_DEFAULT)] = enabledByDefault;
     doc[FPSTR(HA_UNIQUE_ID)] = this->getObjectId(F("indoor_temp"));
     doc[FPSTR(HA_OBJECT_ID)] = this->getObjectId(F("indoor_temp"));
     doc[FPSTR(HA_ENTITY_CATEGORY)] = F("config");
-    doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = F("°C");
+
+    if (unit == UnitSystem::METRIC) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_C);
+      doc[FPSTR(HA_MIN)] = -99;
+      doc[FPSTR(HA_MAX)] = 99;
+      
+    } else if (unit == UnitSystem::IMPERIAL) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_F);
+      doc[FPSTR(HA_MIN)] = -147;
+      doc[FPSTR(HA_MAX)] = 211;
+    }
+
     doc[FPSTR(HA_NAME)] = F("Indoor temperature");
     doc[FPSTR(HA_ICON)] = F("mdi:home-thermometer");
     doc[FPSTR(HA_STATE_TOPIC)] = this->getDeviceTopic(F("state"));
     doc[FPSTR(HA_VALUE_TEMPLATE)] = F("{{ value_json.temperatures.indoor|float(0)|round(1) }}");
     doc[FPSTR(HA_COMMAND_TOPIC)] = this->getDeviceTopic(F("state/set"));
     doc[FPSTR(HA_COMMAND_TEMPLATE)] = F("{\"temperatures\": {\"indoor\":{{ value }}}}");
-    doc[FPSTR(HA_MIN)] = -99;
-    doc[FPSTR(HA_MAX)] = 99;
     doc[FPSTR(HA_STEP)] = 0.01;
     doc[FPSTR(HA_MODE)] = "box";
     doc[FPSTR(HA_EXPIRE_AFTER)] = 120;
@@ -1050,7 +1192,7 @@ public:
     return this->publish(this->getTopic(FPSTR(HA_ENTITY_NUMBER), F("indoor_temp")).c_str(), doc);
   }
 
-  bool publishSensorIndoorTemp(bool enabledByDefault = true) {
+  bool publishSensorIndoorTemp(UnitSystem unit = UnitSystem::METRIC, bool enabledByDefault = true) {
     JsonDocument doc;
     doc[FPSTR(HA_AVAILABILITY)][FPSTR(HA_TOPIC)] = this->getDeviceTopic(F("status"));
     doc[FPSTR(HA_ENABLED_BY_DEFAULT)] = enabledByDefault;
@@ -1059,7 +1201,14 @@ public:
     doc[FPSTR(HA_ENTITY_CATEGORY)] = F("diagnostic");
     doc[FPSTR(HA_DEVICE_CLASS)] = F("temperature");
     doc[FPSTR(HA_STATE_CLASS)] = F("measurement");
-    doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = F("°C");
+
+    if (unit == UnitSystem::METRIC) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_C);
+      
+    } else if (unit == UnitSystem::IMPERIAL) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_F);
+    }
+
     doc[FPSTR(HA_NAME)] = F("Indoor temperature");
     doc[FPSTR(HA_ICON)] = F("mdi:home-thermometer");
     doc[FPSTR(HA_STATE_TOPIC)] = this->getDeviceTopic(F("state"));
@@ -1070,21 +1219,30 @@ public:
     return this->publish(this->getTopic(FPSTR(HA_ENTITY_SENSOR), F("indoor_temp")).c_str(), doc);
   }
 
-  bool publishNumberOutdoorTemp(bool enabledByDefault = true) {
+  bool publishNumberOutdoorTemp(UnitSystem unit = UnitSystem::METRIC, bool enabledByDefault = true) {
     JsonDocument doc;
     doc[FPSTR(HA_ENABLED_BY_DEFAULT)] = enabledByDefault;
     doc[FPSTR(HA_UNIQUE_ID)] = this->getObjectId(F("outdoor_temp"));
     doc[FPSTR(HA_OBJECT_ID)] = this->getObjectId(F("outdoor_temp"));
     doc[FPSTR(HA_ENTITY_CATEGORY)] = F("config");
-    doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = F("°C");
+
+    if (unit == UnitSystem::METRIC) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_C);
+      doc[FPSTR(HA_MIN)] = -99;
+      doc[FPSTR(HA_MAX)] = 99;
+      
+    } else if (unit == UnitSystem::IMPERIAL) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_F);
+      doc[FPSTR(HA_MIN)] = -147;
+      doc[FPSTR(HA_MAX)] = 211;
+    }
+
     doc[FPSTR(HA_NAME)] = F("Outdoor temperature");
     doc[FPSTR(HA_ICON)] = F("mdi:home-thermometer-outline");
     doc[FPSTR(HA_STATE_TOPIC)] = this->getDeviceTopic(F("state"));
     doc[FPSTR(HA_VALUE_TEMPLATE)] = F("{{ value_json.temperatures.outdoor|float(0)|round(1) }}");
     doc[FPSTR(HA_COMMAND_TOPIC)] = this->getDeviceTopic(F("state/set"));
     doc[FPSTR(HA_COMMAND_TEMPLATE)] = F("{\"temperatures\": {\"outdoor\":{{ value }}}}");
-    doc[FPSTR(HA_MIN)] = -99;
-    doc[FPSTR(HA_MAX)] = 99;
     doc[FPSTR(HA_STEP)] = 0.01;
     doc[FPSTR(HA_MODE)] = "box";
     doc[FPSTR(HA_EXPIRE_AFTER)] = 120;
@@ -1093,7 +1251,7 @@ public:
     return this->publish(this->getTopic(FPSTR(HA_ENTITY_NUMBER), F("outdoor_temp")).c_str(), doc);
   }
 
-  bool publishSensorOutdoorTemp(bool enabledByDefault = true) {
+  bool publishSensorOutdoorTemp(UnitSystem unit = UnitSystem::METRIC, bool enabledByDefault = true) {
     JsonDocument doc;
     doc[FPSTR(HA_AVAILABILITY)][FPSTR(HA_TOPIC)] = this->getDeviceTopic(F("status"));
     doc[FPSTR(HA_ENABLED_BY_DEFAULT)] = enabledByDefault;
@@ -1102,7 +1260,14 @@ public:
     doc[FPSTR(HA_ENTITY_CATEGORY)] = F("diagnostic");
     doc[FPSTR(HA_DEVICE_CLASS)] = F("temperature");
     doc[FPSTR(HA_STATE_CLASS)] = F("measurement");
-    doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = F("°C");
+
+    if (unit == UnitSystem::METRIC) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_C);
+      
+    } else if (unit == UnitSystem::IMPERIAL) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_F);
+    }
+
     doc[FPSTR(HA_NAME)] = F("Outdoor temperature");
     doc[FPSTR(HA_ICON)] = F("mdi:home-thermometer-outline");
     doc[FPSTR(HA_STATE_TOPIC)] = this->getDeviceTopic(F("state"));
@@ -1113,7 +1278,7 @@ public:
     return this->publish(this->getTopic(FPSTR(HA_ENTITY_SENSOR), F("outdoor_temp")).c_str(), doc);
   }
 
-  bool publishSensorHeatingTemp(bool enabledByDefault = true) {
+  bool publishSensorHeatingTemp(UnitSystem unit = UnitSystem::METRIC, bool enabledByDefault = true) {
     JsonDocument doc;
     doc[FPSTR(HA_AVAILABILITY)][0][FPSTR(HA_TOPIC)] = this->getDeviceTopic(F("status"));
     doc[FPSTR(HA_AVAILABILITY)][1][FPSTR(HA_TOPIC)] = this->getDeviceTopic(F("state"));
@@ -1125,7 +1290,14 @@ public:
     doc[FPSTR(HA_ENTITY_CATEGORY)] = F("diagnostic");
     doc[FPSTR(HA_DEVICE_CLASS)] = F("temperature");
     doc[FPSTR(HA_STATE_CLASS)] = F("measurement");
-    doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = F("°C");
+
+    if (unit == UnitSystem::METRIC) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_C);
+      
+    } else if (unit == UnitSystem::IMPERIAL) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_F);
+    }
+
     doc[FPSTR(HA_NAME)] = F("Heating temperature");
     doc[FPSTR(HA_ICON)] = F("mdi:radiator");
     doc[FPSTR(HA_STATE_TOPIC)] = this->getDeviceTopic(F("state"));
@@ -1136,7 +1308,37 @@ public:
     return this->publish(this->getTopic(FPSTR(HA_ENTITY_SENSOR), F("heating_temp")).c_str(), doc);
   }
 
-  bool publishSensorDhwTemp(bool enabledByDefault = true) {
+  bool publishSensorHeatingReturnTemp(UnitSystem unit = UnitSystem::METRIC, bool enabledByDefault = true) {
+    JsonDocument doc;
+    doc[FPSTR(HA_AVAILABILITY)][0][FPSTR(HA_TOPIC)] = this->getDeviceTopic(F("status"));
+    doc[FPSTR(HA_AVAILABILITY)][1][FPSTR(HA_TOPIC)] = this->getDeviceTopic(F("state"));
+    doc[FPSTR(HA_AVAILABILITY)][1][FPSTR(HA_VALUE_TEMPLATE)] = F("{{ iif(value_json.states.otStatus, 'online', 'offline') }}");
+    doc[FPSTR(HA_AVAILABILITY_MODE)] = F("all");
+    doc[FPSTR(HA_ENABLED_BY_DEFAULT)] = enabledByDefault;
+    doc[FPSTR(HA_UNIQUE_ID)] = this->getObjectId(F("heating_return_temp"));
+    doc[FPSTR(HA_OBJECT_ID)] = this->getObjectId(F("heating_return_temp"));
+    doc[FPSTR(HA_ENTITY_CATEGORY)] = F("diagnostic");
+    doc[FPSTR(HA_DEVICE_CLASS)] = F("temperature");
+    doc[FPSTR(HA_STATE_CLASS)] = F("measurement");
+
+    if (unit == UnitSystem::METRIC) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_C);
+      
+    } else if (unit == UnitSystem::IMPERIAL) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_F);
+    }
+
+    doc[FPSTR(HA_NAME)] = F("Heating return temperature");
+    doc[FPSTR(HA_ICON)] = F("mdi:radiator");
+    doc[FPSTR(HA_STATE_TOPIC)] = this->getDeviceTopic(F("state"));
+    doc[FPSTR(HA_VALUE_TEMPLATE)] = F("{{ value_json.temperatures.heatingReturn|float(0)|round(2) }}");
+    doc[FPSTR(HA_EXPIRE_AFTER)] = 120;
+    doc.shrinkToFit();
+
+    return this->publish(this->getTopic(FPSTR(HA_ENTITY_SENSOR), F("heating_return_temp")).c_str(), doc);
+  }
+
+  bool publishSensorDhwTemp(UnitSystem unit = UnitSystem::METRIC, bool enabledByDefault = true) {
     JsonDocument doc;
     doc[FPSTR(HA_AVAILABILITY)][0][FPSTR(HA_TOPIC)] = this->getDeviceTopic(F("status"));
     doc[FPSTR(HA_AVAILABILITY)][1][FPSTR(HA_TOPIC)] = this->getDeviceTopic(F("state"));
@@ -1148,7 +1350,14 @@ public:
     doc[FPSTR(HA_ENTITY_CATEGORY)] = F("diagnostic");
     doc[FPSTR(HA_DEVICE_CLASS)] = F("temperature");
     doc[FPSTR(HA_STATE_CLASS)] = F("measurement");
-    doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = F("°C");
+
+    if (unit == UnitSystem::METRIC) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_C);
+      
+    } else if (unit == UnitSystem::IMPERIAL) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_F);
+    }
+
     doc[FPSTR(HA_NAME)] = F("DHW temperature");
     doc[FPSTR(HA_ICON)] = F("mdi:water-pump");
     doc[FPSTR(HA_STATE_TOPIC)] = this->getDeviceTopic(F("state"));
@@ -1159,8 +1368,38 @@ public:
     return this->publish(this->getTopic(FPSTR(HA_ENTITY_SENSOR), F("dhw_temp")).c_str(), doc);
   }
 
+  bool publishSensorExhaustTemp(UnitSystem unit = UnitSystem::METRIC, bool enabledByDefault = true) {
+    JsonDocument doc;
+    doc[FPSTR(HA_AVAILABILITY)][0][FPSTR(HA_TOPIC)] = this->getDeviceTopic(F("status"));
+    doc[FPSTR(HA_AVAILABILITY)][1][FPSTR(HA_TOPIC)] = this->getDeviceTopic(F("state"));
+    doc[FPSTR(HA_AVAILABILITY)][1][FPSTR(HA_VALUE_TEMPLATE)] = F("{{ iif(value_json.states.otStatus, 'online', 'offline') }}");
+    doc[FPSTR(HA_AVAILABILITY_MODE)] = F("all");
+    doc[FPSTR(HA_ENABLED_BY_DEFAULT)] = enabledByDefault;
+    doc[FPSTR(HA_UNIQUE_ID)] = this->getObjectId(F("exhaust_temp"));
+    doc[FPSTR(HA_OBJECT_ID)] = this->getObjectId(F("exhaust_temp"));
+    doc[FPSTR(HA_ENTITY_CATEGORY)] = F("diagnostic");
+    doc[FPSTR(HA_DEVICE_CLASS)] = F("temperature");
+    doc[FPSTR(HA_STATE_CLASS)] = F("measurement");
 
-  bool publishClimateHeating(byte minTemp = 20, byte maxTemp = 90, byte currentTempSource = HaHelper::TEMP_SOURCE_HEATING, bool enabledByDefault = true) {
+    if (unit == UnitSystem::METRIC) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_C);
+      
+    } else if (unit == UnitSystem::IMPERIAL) {
+      doc[FPSTR(HA_UNIT_OF_MEASUREMENT)] = FPSTR(HA_UNIT_OF_MEASUREMENT_F);
+    }
+
+    doc[FPSTR(HA_NAME)] = F("Exhaust temperature");
+    doc[FPSTR(HA_ICON)] = F("mdi:smoke");
+    doc[FPSTR(HA_STATE_TOPIC)] = this->getDeviceTopic(F("state"));
+    doc[FPSTR(HA_VALUE_TEMPLATE)] = F("{{ value_json.temperatures.exhaust|float(0)|round(2) }}");
+    doc[FPSTR(HA_EXPIRE_AFTER)] = 120;
+    doc.shrinkToFit();
+
+    return this->publish(this->getTopic(FPSTR(HA_ENTITY_SENSOR), F("exhaust_temp")).c_str(), doc);
+  }
+
+
+  bool publishClimateHeating(UnitSystem unit = UnitSystem::METRIC, byte minTemp = 20, byte maxTemp = 90, byte currentTempSource = HaHelper::TEMP_SOURCE_HEATING, bool enabledByDefault = true) {
     JsonDocument doc;
     doc[FPSTR(HA_AVAILABILITY)][FPSTR(HA_TOPIC)] = this->getDeviceTopic(F("status"));
     doc[FPSTR(HA_ENABLED_BY_DEFAULT)] = enabledByDefault;
@@ -1186,6 +1425,13 @@ public:
     doc[FPSTR(HA_TEMPERATURE_STATE_TOPIC)] = this->getDeviceTopic(F("settings"));
     doc[FPSTR(HA_TEMPERATURE_STATE_TEMPLATE)] = F("{{ value_json.heating.target|float(0)|round(1) }}");
 
+    if (unit == UnitSystem::METRIC) {
+      doc[FPSTR(HA_TEMPERATURE_UNIT)] = "C";
+      
+    } else if (unit == UnitSystem::IMPERIAL) {
+      doc[FPSTR(HA_TEMPERATURE_UNIT)] = "F";
+    }
+
     doc[FPSTR(HA_MODE_COMMAND_TOPIC)] = this->getDeviceTopic(F("settings/set"));
     doc[FPSTR(HA_MODE_COMMAND_TEMPLATE)] = F("{% if value == 'heat' %}{\"heating\": {\"enable\" : true}}"
       "{% elif value == 'off' %}{\"heating\": {\"enable\" : false}}{% endif %}");
@@ -1213,7 +1459,7 @@ public:
     return this->publish(this->getTopic(FPSTR(HA_ENTITY_CLIMATE), F("heating"), '_').c_str(), doc);
   }
 
-  bool publishClimateDhw(byte minTemp = 40, byte maxTemp = 60, bool enabledByDefault = true) {
+  bool publishClimateDhw(UnitSystem unit = UnitSystem::METRIC, byte minTemp = 40, byte maxTemp = 60, bool enabledByDefault = true) {
     JsonDocument doc;
     doc[FPSTR(HA_AVAILABILITY)][FPSTR(HA_TOPIC)] = this->getDeviceTopic(F("status"));
     doc[FPSTR(HA_ENABLED_BY_DEFAULT)] = enabledByDefault;
@@ -1231,6 +1477,13 @@ public:
     doc[FPSTR(HA_TEMPERATURE_STATE_TOPIC)] = this->getDeviceTopic(F("settings"));
     doc[FPSTR(HA_TEMPERATURE_STATE_TEMPLATE)] = F("{{ value_json.dhw.target|int(0) }}");
 
+    if (unit == UnitSystem::METRIC) {
+      doc[FPSTR(HA_TEMPERATURE_UNIT)] = "C";
+      
+    } else if (unit == UnitSystem::IMPERIAL) {
+      doc[FPSTR(HA_TEMPERATURE_UNIT)] = "F";
+    }
+
     doc[FPSTR(HA_MODE_COMMAND_TOPIC)] = this->getDeviceTopic(F("settings/set"));
     doc[FPSTR(HA_MODE_COMMAND_TEMPLATE)] = F("{% if value == 'heat' %}{\"dhw\": {\"enable\" : true}}"
       "{% elif value == 'off' %}{\"dhw\": {\"enable\" : false}}{% endif %}");

src/MainTask.h

@@ -52,14 +52,14 @@ protected:
   }
 
   void setup() {
-    #ifdef LED_STATUS_PIN
+    #ifdef LED_STATUS_GPIO
-      pinMode(LED_STATUS_PIN, OUTPUT);
+      pinMode(LED_STATUS_GPIO, OUTPUT);
-      digitalWrite(LED_STATUS_PIN, LOW);
+      digitalWrite(LED_STATUS_GPIO, LOW);
     #endif
 
-    if (settings.externalPump.pin != 0) {
+    if (GPIO_IS_VALID(settings.externalPump.gpio)) {
-      pinMode(settings.externalPump.pin, OUTPUT);
+      pinMode(settings.externalPump.gpio, OUTPUT);
-      digitalWrite(settings.externalPump.pin, LOW);
+      digitalWrite(settings.externalPump.gpio, LOW);
     }
   }
 
@@ -89,10 +89,6 @@ protected:
       Log.sinfoln(FPSTR(L_MAIN), F("Restart signal received. Restart after 10 sec."));
     }
 
-    if (!tOt->isEnabled() && settings.opentherm.inPin > 0 && settings.opentherm.outPin > 0 && settings.opentherm.inPin != settings.opentherm.outPin) {
-      tOt->enable();
-    }
-
     if (network->isConnected()) {
       vars.sensors.rssi = WiFi.RSSI();
 
@@ -140,8 +136,8 @@ protected:
     this->yield();
 
 
-    #ifdef LED_STATUS_PIN
+    #ifdef LED_STATUS_GPIO
-      this->ledStatus(LED_STATUS_PIN);
+      this->ledStatus(LED_STATUS_GPIO);
     #endif
     this->externalPump();
     this->yield();
@@ -211,7 +207,7 @@ protected:
     }
   }
 
-  void ledStatus(uint8_t ledPin) {
+  void ledStatus(uint8_t gpio) {
     uint8_t errors[4];
     uint8_t errCount = 0;
     static uint8_t errPos = 0;
@@ -219,7 +215,7 @@ protected:
     static bool ledOn = false;
 
     if (!this->blinkerInitialized) {
-      this->blinker->init(ledPin);
+      this->blinker->init(gpio);
       this->blinkerInitialized = true;
     }
 
@@ -247,14 +243,14 @@ protected:
     if (!this->blinker->running() && millis() - endBlinkTime >= 5000) {
       if (errCount == 0) {
         if (!ledOn) {
-          digitalWrite(ledPin, HIGH);
+          digitalWrite(gpio, HIGH);
           ledOn = true;
         }
 
         return;
 
       } else if (ledOn) {
-        digitalWrite(ledPin, LOW);
+        digitalWrite(gpio, LOW);
         ledOn = false;
         endBlinkTime = millis();
         return;
@@ -283,10 +279,10 @@ protected:
       this->heatingEnabled = true;
     }
     
-    if (!settings.externalPump.use || settings.externalPump.pin == 0) {
+    if (!settings.externalPump.use || !GPIO_IS_VALID(settings.externalPump.gpio)) {
       if (vars.states.externalPump) {
-        if (settings.externalPump.pin != 0) {
+        if (GPIO_IS_VALID(settings.externalPump.gpio)) {
-          digitalWrite(settings.externalPump.pin, LOW);
+          digitalWrite(settings.externalPump.gpio, LOW);
         }
 
         vars.states.externalPump = false;
@@ -300,7 +296,7 @@ protected:
 
     if (vars.states.externalPump && !this->heatingEnabled) {
       if (this->extPumpStartReason == MainTask::PumpStartReason::HEATING && millis() - this->heatingDisabledTime > (settings.externalPump.postCirculationTime * 1000u)) {
-        digitalWrite(settings.externalPump.pin, LOW);
+        digitalWrite(settings.externalPump.gpio, LOW);
 
         vars.states.externalPump = false;
         vars.parameters.extPumpLastEnableTime = millis();
@@ -308,7 +304,7 @@ protected:
         Log.sinfoln("EXTPUMP", F("Disabled: expired post circulation time"));
 
       } else if (this->extPumpStartReason == MainTask::PumpStartReason::ANTISTUCK && millis() - this->externalPumpStartTime >= (settings.externalPump.antiStuckTime * 1000u)) {
-        digitalWrite(settings.externalPump.pin, LOW);
+        digitalWrite(settings.externalPump.gpio, LOW);
 
         vars.states.externalPump = false;
         vars.parameters.extPumpLastEnableTime = millis();
@@ -324,7 +320,7 @@ protected:
       this->externalPumpStartTime = millis();
       this->extPumpStartReason = MainTask::PumpStartReason::HEATING;
 
-      digitalWrite(settings.externalPump.pin, HIGH);
+      digitalWrite(settings.externalPump.gpio, HIGH);
 
       Log.sinfoln("EXTPUMP", F("Enabled: heating on"));
 
@@ -333,7 +329,7 @@ protected:
       this->externalPumpStartTime = millis();
       this->extPumpStartReason = MainTask::PumpStartReason::ANTISTUCK;
 
-      digitalWrite(settings.externalPump.pin, HIGH);
+      digitalWrite(settings.externalPump.gpio, HIGH);
 
       Log.sinfoln("EXTPUMP", F("Enabled: anti stuck"));
     }

src/MqttTask.h

@@ -51,6 +51,7 @@ protected:
   MqttClient* client = nullptr;
   HaHelper* haHelper = nullptr;
   MqttWriter* writer = nullptr;
+  UnitSystem currentUnitSystem = UnitSystem::METRIC;
   unsigned short readyForSendTime = 15000;
   unsigned long lastReconnectTime = 0;
   unsigned long connectedTime = 0;
@@ -69,7 +70,7 @@ protected:
   }*/
 
   int getTaskPriority() {
-    return 1;
+    return 2;
   }
 
   bool isReadyForSend() {
@@ -213,10 +214,11 @@ protected:
     }
 
     // publish ha entities if not published
-    if (this->newConnection) {
+    if (this->newConnection || this->currentUnitSystem != settings.system.unitSystem) {
       this->publishHaEntities();
       this->publishNonStaticHaEntities(true);
       this->newConnection = false;
+      this->currentUnitSystem = settings.system.unitSystem;
 
     } else {
       // publish non static ha entities
@@ -318,19 +320,19 @@ protected:
   void publishHaEntities() {
     // emergency
     this->haHelper->publishSwitchEmergency();
-    this->haHelper->publishNumberEmergencyTarget();
+    this->haHelper->publishNumberEmergencyTarget(settings.system.unitSystem);
     this->haHelper->publishSwitchEmergencyUseEquitherm();
     this->haHelper->publishSwitchEmergencyUsePid();
 
     // heating
     this->haHelper->publishSwitchHeating(false);
     this->haHelper->publishSwitchHeatingTurbo();
-    this->haHelper->publishNumberHeatingHysteresis();
+    this->haHelper->publishNumberHeatingHysteresis(settings.system.unitSystem);
-    this->haHelper->publishSensorHeatingSetpoint(false);
+    this->haHelper->publishSensorHeatingSetpoint(settings.system.unitSystem, false);
-    this->haHelper->publishSensorBoilerHeatingMinTemp(false);
+    this->haHelper->publishSensorBoilerHeatingMinTemp(settings.system.unitSystem, false);
-    this->haHelper->publishSensorBoilerHeatingMaxTemp(false);
+    this->haHelper->publishSensorBoilerHeatingMaxTemp(settings.system.unitSystem, false);
-    this->haHelper->publishNumberHeatingMinTemp(false);
+    this->haHelper->publishNumberHeatingMinTemp(settings.system.unitSystem, false);
-    this->haHelper->publishNumberHeatingMaxTemp(false);
+    this->haHelper->publishNumberHeatingMaxTemp(settings.system.unitSystem, false);
     this->haHelper->publishNumberHeatingMaxModulation(false);
 
     // pid
@@ -339,8 +341,8 @@ protected:
     this->haHelper->publishNumberPidFactorI();
     this->haHelper->publishNumberPidFactorD();
     this->haHelper->publishNumberPidDt(false);
-    this->haHelper->publishNumberPidMinTemp(false);
+    this->haHelper->publishNumberPidMinTemp(settings.system.unitSystem, false);
-    this->haHelper->publishNumberPidMaxTemp(false);
+    this->haHelper->publishNumberPidMaxTemp(settings.system.unitSystem, false);
 
     // equitherm
     this->haHelper->publishSwitchEquitherm();
@@ -362,14 +364,16 @@ protected:
 
     // sensors
     this->haHelper->publishSensorModulation(false);
-    this->haHelper->publishSensorPressure(false);
+    this->haHelper->publishSensorPressure(settings.system.unitSystem, false);
     this->haHelper->publishSensorFaultCode();
     this->haHelper->publishSensorRssi(false);
     this->haHelper->publishSensorUptime(false);
 
     // temperatures
-    this->haHelper->publishNumberIndoorTemp();
+    this->haHelper->publishNumberIndoorTemp(settings.system.unitSystem);
-    this->haHelper->publishSensorHeatingTemp();
+    this->haHelper->publishSensorHeatingTemp(settings.system.unitSystem);
+    this->haHelper->publishSensorHeatingReturnTemp(settings.system.unitSystem, false);
+    this->haHelper->publishSensorExhaustTemp(settings.system.unitSystem, false);
 
     // buttons
     this->haHelper->publishButtonRestart(false);
@@ -383,23 +387,36 @@ protected:
 
     bool published = false;
     bool isStupidMode = !settings.pid.enable && !settings.equitherm.enable;
-    byte heatingMinTemp = isStupidMode ? settings.heating.minTemp : 10;
+    byte heatingMinTemp = 0;
-    byte heatingMaxTemp = isStupidMode ? settings.heating.maxTemp : 30;
+    byte heatingMaxTemp = 0;
-    bool editableOutdoorTemp = settings.sensors.outdoor.type == 1;
+    bool editableOutdoorTemp = settings.sensors.outdoor.type == SensorType::MANUAL;
-    bool editableIndoorTemp = settings.sensors.indoor.type == 1;
+    bool editableIndoorTemp = settings.sensors.indoor.type == SensorType::MANUAL;
+
+    if (isStupidMode) {
+      heatingMinTemp = settings.heating.minTemp;
+      heatingMaxTemp = settings.heating.maxTemp;
+
+    } else if (settings.system.unitSystem == UnitSystem::METRIC) {
+      heatingMinTemp = 5;
+      heatingMaxTemp = 30;
+
+    } else if (settings.system.unitSystem == UnitSystem::IMPERIAL) {
+      heatingMinTemp = 41;
+      heatingMaxTemp = 86;
+    }
 
     if (force || _dhwPresent != settings.opentherm.dhwPresent) {
       _dhwPresent = settings.opentherm.dhwPresent;
 
       if (_dhwPresent) {
         this->haHelper->publishSwitchDhw(false);
-        this->haHelper->publishSensorBoilerDhwMinTemp(false);
+        this->haHelper->publishSensorBoilerDhwMinTemp(settings.system.unitSystem, false);
-        this->haHelper->publishSensorBoilerDhwMaxTemp(false);
+        this->haHelper->publishSensorBoilerDhwMaxTemp(settings.system.unitSystem, false);
-        this->haHelper->publishNumberDhwMinTemp(false);
+        this->haHelper->publishNumberDhwMinTemp(settings.system.unitSystem, false);
-        this->haHelper->publishNumberDhwMaxTemp(false);
+        this->haHelper->publishNumberDhwMaxTemp(settings.system.unitSystem, false);
         this->haHelper->publishBinSensorDhw();
-        this->haHelper->publishSensorDhwTemp();
+        this->haHelper->publishSensorDhwTemp(settings.system.unitSystem);
-        this->haHelper->publishSensorDhwFlowRate(false);
+        this->haHelper->publishSensorDhwFlowRate(settings.system.unitSystem, false);
 
       } else {
         this->haHelper->deleteSwitchDhw();
@@ -426,8 +443,9 @@ protected:
       _heatingMaxTemp = heatingMaxTemp;
       _isStupidMode = isStupidMode;
 
-      this->haHelper->publishNumberHeatingTarget(heatingMinTemp, heatingMaxTemp, false);
+      this->haHelper->publishNumberHeatingTarget(settings.system.unitSystem, heatingMinTemp, heatingMaxTemp, false);
       this->haHelper->publishClimateHeating(
+        settings.system.unitSystem,
         heatingMinTemp,
         heatingMaxTemp,
         isStupidMode ? HaHelper::TEMP_SOURCE_HEATING : HaHelper::TEMP_SOURCE_INDOOR
@@ -438,6 +456,7 @@ protected:
     } else if (_isStupidMode != isStupidMode) {
       _isStupidMode = isStupidMode;
       this->haHelper->publishClimateHeating(
+        settings.system.unitSystem,
         heatingMinTemp,
         heatingMaxTemp,
         isStupidMode ? HaHelper::TEMP_SOURCE_HEATING : HaHelper::TEMP_SOURCE_INDOOR
@@ -450,8 +469,8 @@ protected:
       _dhwMinTemp = settings.dhw.minTemp;
       _dhwMaxTemp = settings.dhw.maxTemp;
 
-      this->haHelper->publishNumberDhwTarget(settings.dhw.minTemp, settings.dhw.maxTemp, false);
+      this->haHelper->publishNumberDhwTarget(settings.system.unitSystem, settings.dhw.minTemp, settings.dhw.maxTemp, false);
-      this->haHelper->publishClimateDhw(settings.dhw.minTemp, settings.dhw.maxTemp);
+      this->haHelper->publishClimateDhw(settings.system.unitSystem, settings.dhw.minTemp, settings.dhw.maxTemp);
 
       published = true;
     }
@@ -461,10 +480,10 @@ protected:
 
       if (editableOutdoorTemp) {
         this->haHelper->deleteSensorOutdoorTemp();
-        this->haHelper->publishNumberOutdoorTemp();
+        this->haHelper->publishNumberOutdoorTemp(settings.system.unitSystem);
       } else {
         this->haHelper->deleteNumberOutdoorTemp();
-        this->haHelper->publishSensorOutdoorTemp();
+        this->haHelper->publishSensorOutdoorTemp(settings.system.unitSystem);
       }
 
       published = true;
@@ -475,10 +494,10 @@ protected:
 
       if (editableIndoorTemp) {
         this->haHelper->deleteSensorIndoorTemp();
-        this->haHelper->publishNumberIndoorTemp();
+        this->haHelper->publishNumberIndoorTemp(settings.system.unitSystem);
       } else {
         this->haHelper->deleteNumberIndoorTemp();
-        this->haHelper->publishSensorIndoorTemp();
+        this->haHelper->publishSensorIndoorTemp(settings.system.unitSystem);
       }
 
       published = true;

src/OpenThermTask.h

@@ -1,31 +1,35 @@
 #include <CustomOpenTherm.h>
-
-CustomOpenTherm* ot;
 extern FileData fsSettings;
 
 class OpenThermTask : public Task {
 public:
-  OpenThermTask(bool _enabled = false, unsigned long _interval = 0) : Task(_enabled, _interval) {
+  OpenThermTask(bool _enabled = false, unsigned long _interval = 0) : Task(_enabled, _interval) {}
-    ot = new CustomOpenTherm(settings.opentherm.inPin, settings.opentherm.outPin);
-  }
 
-  static void IRAM_ATTR handleInterrupt() {
+  ~OpenThermTask() {
-    ot->handleInterrupt();
+    delete this->instance;
   }
 
 protected:
-  unsigned short readyTime = 60000;
+  const unsigned short readyTime = 60000;
-  unsigned short dhwSetTempInterval = 60000;
+  const unsigned short dhwSetTempInterval = 60000;
-  unsigned short heatingSetTempInterval = 60000;
+  const unsigned short heatingSetTempInterval = 60000;
+  const unsigned int initializingInterval = 3600000;
 
+  CustomOpenTherm* instance = nullptr;
+  unsigned long instanceCreatedTime = 0;
+  byte instanceInGpio = 0;
+  byte instanceOutGpio = 0;
+  bool isInitialized = false;
+  unsigned long initializedTime = 0;
+  unsigned int initializedMemberIdCode = 0;
+  byte dhwFlowRateMultiplier = 1;
+  byte pressureMultiplier = 1;
   bool pump = true;
   unsigned long lastSuccessResponse = 0;
   unsigned long prevUpdateNonEssentialVars = 0;
-  unsigned long startupTime = millis();
   unsigned long dhwSetTempTime = 0;
   unsigned long heatingSetTempTime = 0;
-  byte dhwFlowRateMultiplier = 1;
+
-  byte pressureMultiplier = 1;
 
   const char* getTaskName() {
     return "OpenTherm";
@@ -36,85 +40,88 @@ protected:
   }
 
   int getTaskPriority() {
-    return 2;
+    return 5;
   }
 
   void setup() {
-    Log.sinfoln(FPSTR(L_OT), F("Started. GPIO IN: %hhu, GPIO OUT: %hhu"), settings.opentherm.inPin, settings.opentherm.outPin);
+    if (settings.system.unitSystem != UnitSystem::METRIC) {
+      vars.parameters.heatingMinTemp = convertTemp(vars.parameters.heatingMinTemp, UnitSystem::METRIC, settings.system.unitSystem);
+      vars.parameters.heatingMaxTemp = convertTemp(vars.parameters.heatingMaxTemp, UnitSystem::METRIC, settings.system.unitSystem);
+      vars.parameters.dhwMinTemp = convertTemp(vars.parameters.dhwMinTemp, UnitSystem::METRIC, settings.system.unitSystem);
+      vars.parameters.dhwMaxTemp = convertTemp(vars.parameters.dhwMaxTemp, UnitSystem::METRIC, settings.system.unitSystem);
+    }
     
-    ot->setAfterSendRequestCallback([this](unsigned long request, unsigned long response, OpenThermResponseStatus status, byte attempt) {
+    #ifdef LED_OT_RX_GPIO
+      pinMode(LED_OT_RX_GPIO, OUTPUT);
+      digitalWrite(LED_OT_RX_GPIO, LOW);
+    #endif
+
+    // delete instance
+    if (this->instance != nullptr) {
+      delete this->instance;
+      this->instance = nullptr;
+      Log.sinfoln(FPSTR(L_OT), F("Stopped"));
+    }
+
+    if (!GPIO_IS_VALID(settings.opentherm.inGpio) || !GPIO_IS_VALID(settings.opentherm.outGpio)) {
+      Log.swarningln(FPSTR(L_OT), F("Not started. GPIO IN: %hhu or GPIO OUT: %hhu is not valid"), settings.opentherm.inGpio, settings.opentherm.outGpio);
+      return;
+    }
+
+    // create instance
+    this->instance = new CustomOpenTherm(settings.opentherm.inGpio, settings.opentherm.outGpio);
+
+    // flags
+    this->instanceCreatedTime = millis();
+    this->instanceInGpio = settings.opentherm.inGpio;
+    this->instanceOutGpio = settings.opentherm.outGpio;
+    this->isInitialized = false;
+
+    Log.sinfoln(FPSTR(L_OT), F("Started. GPIO IN: %hhu, GPIO OUT: %hhu"), settings.opentherm.inGpio, settings.opentherm.outGpio);
+
+    this->instance->setAfterSendRequestCallback([this](unsigned long request, unsigned long response, OpenThermResponseStatus status, byte attempt) {
       Log.straceln(
         FPSTR(L_OT),
         F("ID: %4d   Request: %8lx   Response: %8lx   Attempt: %2d   Status: %s"),
-        ot->getDataID(request), request, response, attempt, ot->statusToString(status)
+        CustomOpenTherm::getDataID(request), request, response, attempt, CustomOpenTherm::statusToString(status)
       );
 
       if (status == OpenThermResponseStatus::SUCCESS) {
         this->lastSuccessResponse = millis();
 
-        #ifdef LED_OT_RX_PIN
+        #ifdef LED_OT_RX_GPIO
         {
-          digitalWrite(LED_OT_RX_PIN, HIGH);
+          digitalWrite(LED_OT_RX_GPIO, HIGH);
           delayMicroseconds(2000);
-          digitalWrite(LED_OT_RX_PIN, LOW);
+          digitalWrite(LED_OT_RX_GPIO, LOW);
         }
         #endif
       }
     });
 
-    ot->setYieldCallback([this]() {
+    this->instance->setYieldCallback([this]() {
       this->delay(25);
     });
 
-    ot->setMinWaitTimeForStartBit(20000);
+    this->instance->begin();
-    ot->begin(OpenThermTask::handleInterrupt);
-
-    #ifdef LED_OT_RX_PIN
-      pinMode(LED_OT_RX_PIN, OUTPUT);
-      digitalWrite(LED_OT_RX_PIN, LOW);
-    #endif
-  }
-
-  void initBoiler() {
-    this->dhwFlowRateMultiplier = 1;
-    this->pressureMultiplier = 1;
-
-    // Not all boilers support these, only try once when the boiler becomes connected
-    if (updateSlaveVersion()) {
-      Log.straceln(FPSTR(L_OT), F("Slave version: %u, type: %u"), vars.parameters.slaveVersion, vars.parameters.slaveType);
-
-    } else {
-      Log.swarningln(FPSTR(L_OT), F("Get slave version failed"));
-    }
-
-    // 0x013F
-    if (setMasterVersion(0x3F, 0x01)) {
-      Log.straceln(FPSTR(L_OT), F("Master version: %u, type: %u"), vars.parameters.masterVersion, vars.parameters.masterType);
-      
-    } else {
-      Log.swarningln(FPSTR(L_OT), F("Set master version failed"));
-    }
-
-    if (updateSlaveConfig()) {
-      Log.straceln(FPSTR(L_OT), F("Slave member id: %u, flags: %u"), vars.parameters.slaveMemberId, vars.parameters.slaveFlags);
-
-    } else {
-      Log.swarningln(FPSTR(L_OT), F("Get slave config failed"));
-    }
-
-    if (setMasterConfig(settings.opentherm.memberIdCode & 0xFF, (settings.opentherm.memberIdCode & 0xFFFF) >> 8)) {
-      Log.straceln(FPSTR(L_OT), F("Master member id: %u, flags: %u"), vars.parameters.masterMemberId, vars.parameters.masterFlags);
-      
-    } else {
-      Log.swarningln(FPSTR(L_OT), F("Set master config failed"));
-    }
   }
 
   void loop() {
     static byte currentHeatingTemp, currentDhwTemp = 0;
-    unsigned long localResponse;
 
-    bool heatingEnabled = (vars.states.emergency || settings.heating.enable) && this->pump && isReady();
+    if (this->instanceInGpio != settings.opentherm.inGpio || this->instanceOutGpio != settings.opentherm.outGpio) {
+      this->setup();
+
+    } else if (this->initializedMemberIdCode != settings.opentherm.memberIdCode || millis() - this->initializedTime > this->initializingInterval) {
+      this->isInitialized = false; 
+    }
+
+    if (this->instance == nullptr) {
+      this->delay(5000);
+      return;
+    }
+
+    bool heatingEnabled = (vars.states.emergency || settings.heating.enable) && this->pump && this->isReady();
     bool heatingCh2Enabled = settings.opentherm.heatingCh2Enabled;
     if (settings.opentherm.heatingCh1ToCh2) {
       heatingCh2Enabled = heatingEnabled;
@@ -123,7 +130,7 @@ protected:
       heatingCh2Enabled = settings.opentherm.dhwPresent && settings.dhw.enable;
     }
 
-    localResponse = ot->setBoilerStatus(
+    unsigned long response = this->instance->setBoilerStatus(
       heatingEnabled,
       settings.opentherm.dhwPresent && settings.dhw.enable,
       false,
@@ -133,20 +140,20 @@ protected:
       settings.opentherm.dhwBlocking
     );
 
-    if (!ot->isValidResponse(localResponse)) {
+    if (!CustomOpenTherm::isValidResponse(response)) {
-      Log.swarningln(FPSTR(L_OT), F("Invalid response after setBoilerStatus: %s"), ot->statusToString(ot->getLastResponseStatus()));
+      Log.swarningln(FPSTR(L_OT), F("Invalid response after setBoilerStatus: %s"), CustomOpenTherm::statusToString(this->instance->getLastResponseStatus()));
     }
 
     if (!vars.states.otStatus && millis() - this->lastSuccessResponse < 1150) {
-      Log.sinfoln(FPSTR(L_OT), F("Connected. Initializing"));
+      Log.sinfoln(FPSTR(L_OT), F("Connected"));
       
       vars.states.otStatus = true;
-      this->initBoiler();
       
     } else if (vars.states.otStatus && millis() - this->lastSuccessResponse > 1150) {
       Log.swarningln(FPSTR(L_OT), F("Disconnected"));
 
       vars.states.otStatus = false;
+      this->isInitialized = false;
     }
 
     // If boiler is disconnected, no need try setting other OT stuff
@@ -160,17 +167,27 @@ protected:
       return;
     }
 
+    if (!this->isInitialized) {
+      Log.sinfoln(FPSTR(L_OT), F("Initializing..."));
+      this->isInitialized = true;
+      this->initializedTime = millis();
+      this->initializedMemberIdCode = settings.opentherm.memberIdCode;
+      this->dhwFlowRateMultiplier = 1;
+      this->pressureMultiplier = 1;
+      this->initialize();
+    }
+
     if (vars.parameters.heatingEnabled != heatingEnabled) {
       this->prevUpdateNonEssentialVars = 0;
       vars.parameters.heatingEnabled = heatingEnabled;
       Log.sinfoln(FPSTR(L_OT_HEATING), "%s", heatingEnabled ? F("Enabled") : F("Disabled"));
     }
 
-    vars.states.heating = ot->isCentralHeatingActive(localResponse);
+    vars.states.heating = CustomOpenTherm::isCentralHeatingActive(response);
-    vars.states.dhw = settings.opentherm.dhwPresent ? ot->isHotWaterActive(localResponse) : false;
+    vars.states.dhw = settings.opentherm.dhwPresent ? CustomOpenTherm::isHotWaterActive(response) : false;
-    vars.states.flame = ot->isFlameOn(localResponse);
+    vars.states.flame = CustomOpenTherm::isFlameOn(response);
-    vars.states.fault = ot->isFault(localResponse);
+    vars.states.fault = CustomOpenTherm::isFault(response);
-    vars.states.diagnostic = ot->isDiagnostic(localResponse);
+    vars.states.diagnostic = CustomOpenTherm::isDiagnostic(response);
 
     // These parameters will be updated every minute
     if (millis() - this->prevUpdateNonEssentialVars > 60000) {
@@ -193,7 +210,7 @@ protected:
 
 
       // Get DHW min/max temp (if necessary)
-      if (settings.opentherm.dhwPresent) {
+      if (settings.opentherm.dhwPresent && settings.opentherm.getMinMaxTemp) {
         if (updateMinMaxDhwTemp()) {
           if (settings.dhw.minTemp < vars.parameters.dhwMinTemp) {
             settings.dhw.minTemp = vars.parameters.dhwMinTemp;
@@ -208,46 +225,51 @@ protected:
           }
 
         } else {
+          vars.parameters.dhwMinTemp = convertTemp(DEFAULT_DHW_MIN_TEMP, UnitSystem::METRIC, settings.system.unitSystem);
+          vars.parameters.dhwMaxTemp = convertTemp(DEFAULT_DHW_MAX_TEMP, UnitSystem::METRIC, settings.system.unitSystem);
+
           Log.swarningln(FPSTR(L_OT_DHW), F("Failed get min/max temp"));
         }
 
         if (settings.dhw.minTemp >= settings.dhw.maxTemp) {
-          settings.dhw.minTemp = 30;
+          settings.dhw.minTemp = vars.parameters.dhwMinTemp;
-          settings.dhw.maxTemp = 60;
+          settings.dhw.maxTemp = vars.parameters.dhwMaxTemp;
           fsSettings.update();
         }
       }
 
 
       // Get heating min/max temp
-      if (updateMinMaxHeatingTemp()) {
+      if (settings.opentherm.getMinMaxTemp) {
-        if (settings.heating.minTemp < vars.parameters.heatingMinTemp) {
+        if (updateMinMaxHeatingTemp()) {
-          settings.heating.minTemp = vars.parameters.heatingMinTemp;
+          if (settings.heating.minTemp < vars.parameters.heatingMinTemp) {
-          fsSettings.update();
+            settings.heating.minTemp = vars.parameters.heatingMinTemp;
-          Log.snoticeln(FPSTR(L_OT_HEATING), F("Updated min temp: %hhu"), settings.heating.minTemp);
+            fsSettings.update();
-        }
+            Log.snoticeln(FPSTR(L_OT_HEATING), F("Updated min temp: %hhu"), settings.heating.minTemp);
+          }
 
-        if (settings.heating.maxTemp > vars.parameters.heatingMaxTemp) {
+          if (settings.heating.maxTemp > vars.parameters.heatingMaxTemp) {
-          settings.heating.maxTemp = vars.parameters.heatingMaxTemp;
+            settings.heating.maxTemp = vars.parameters.heatingMaxTemp;
-          fsSettings.update();
+            fsSettings.update();
-          Log.snoticeln(FPSTR(L_OT_HEATING), F("Updated max temp: %hhu"), settings.heating.maxTemp);
+            Log.snoticeln(FPSTR(L_OT_HEATING), F("Updated max temp: %hhu"), settings.heating.maxTemp);
-        }
+          }
           
-      } else {
+        } else {
-        Log.swarningln(FPSTR(L_OT_HEATING), F("Failed get min/max temp"));
+          vars.parameters.heatingMinTemp = convertTemp(DEFAULT_HEATING_MIN_TEMP, UnitSystem::METRIC, settings.system.unitSystem);
+          vars.parameters.heatingMaxTemp = convertTemp(DEFAULT_HEATING_MAX_TEMP, UnitSystem::METRIC, settings.system.unitSystem);
+
+          Log.swarningln(FPSTR(L_OT_HEATING), F("Failed get min/max temp"));
+        }
       }
 
       if (settings.heating.minTemp >= settings.heating.maxTemp) {
-        settings.heating.minTemp = 20;
+        settings.heating.minTemp = vars.parameters.heatingMinTemp;
-        settings.heating.maxTemp = 90;
+        settings.heating.maxTemp = vars.parameters.heatingMaxTemp;
         fsSettings.update();
       }
 
-      // Force set max heating temp
-      setMaxHeatingTemp(settings.heating.maxTemp);
-
       // Get outdoor temp (if necessary)
-      if (settings.sensors.outdoor.type == 0) {
+      if (settings.sensors.outdoor.type == SensorType::BOILER) {
         updateOutsideTemp();
       }
 
@@ -263,7 +285,7 @@ protected:
 
 
     // Get current modulation level (if necessary)
-    if ((settings.opentherm.dhwPresent && settings.dhw.enable) || settings.heating.enable || heatingEnabled) {
+    if (vars.states.flame) {
       updateModulationLevel();
 
     } else {
@@ -283,11 +305,17 @@ protected:
     // Get current heating temp
     updateHeatingTemp();
 
+    // Get heating return temp
+    updateHeatingReturnTemp();
+
+    // Get exhaust temp
+    updateExhaustTemp();
+
 
     // Fault reset action
     if (vars.actions.resetFault) {
       if (vars.states.fault) {
-        if (ot->sendBoilerReset()) {
+        if (this->instance->sendBoilerReset()) {
           Log.sinfoln(FPSTR(L_OT), F("Boiler fault reset successfully"));
 
         } else {
@@ -301,7 +329,7 @@ protected:
     // Diag reset action
     if (vars.actions.resetDiagnostic) {
       if (vars.states.diagnostic) {
-        if (ot->sendServiceReset()) {
+        if (this->instance->sendServiceReset()) {
           Log.sinfoln(FPSTR(L_OT), F("Boiler diagnostic reset successfully"));
           
         } else {
@@ -315,15 +343,16 @@ protected:
 
     // Update DHW temp
     byte newDhwTemp = settings.dhw.target;
-    if (settings.opentherm.dhwPresent && settings.dhw.enable && (needSetDhwTemp() || newDhwTemp != currentDhwTemp)) {
+    if (settings.opentherm.dhwPresent && settings.dhw.enable && (this->needSetDhwTemp() || newDhwTemp != currentDhwTemp)) {
       if (newDhwTemp < settings.dhw.minTemp || newDhwTemp > settings.dhw.maxTemp) {
         newDhwTemp = constrain(newDhwTemp, settings.dhw.minTemp, settings.dhw.maxTemp);
       }
 
-      Log.sinfoln(FPSTR(L_OT_DHW), F("Set temp = %u"), newDhwTemp);
+      float convertedTemp = convertTemp(newDhwTemp, settings.system.unitSystem, settings.opentherm.unitSystem);
+      Log.sinfoln(FPSTR(L_OT_DHW), F("Set temp: %u (converted: %.2f)"), newDhwTemp, convertedTemp);
 
       // Set DHW temp
-      if (ot->setDhwTemp(newDhwTemp)) {
+      if (this->instance->setDhwTemp(convertedTemp)) {
         currentDhwTemp = newDhwTemp;
         this->dhwSetTempTime = millis();
 
@@ -333,7 +362,7 @@ protected:
 
       // Set DHW temp to CH2
       if (settings.opentherm.dhwToCh2) {
-        if (!ot->setHeatingCh2Temp(newDhwTemp)) {
+        if (!this->instance->setHeatingCh2Temp(convertedTemp)) {
           Log.swarningln(FPSTR(L_OT_DHW), F("Failed set ch2 temp"));
         }
       }
@@ -341,11 +370,12 @@ protected:
 
 
     // Update heating temp
-    if (heatingEnabled && (needSetHeatingTemp() || fabs(vars.parameters.heatingSetpoint - currentHeatingTemp) > 0.0001)) {
+    if (heatingEnabled && (this->needSetHeatingTemp() || fabs(vars.parameters.heatingSetpoint - currentHeatingTemp) > 0.0001)) {
-      Log.sinfoln(FPSTR(L_OT_HEATING), F("Set temp = %u"), vars.parameters.heatingSetpoint);
+      float convertedTemp = convertTemp(vars.parameters.heatingSetpoint, settings.system.unitSystem, settings.opentherm.unitSystem);
+      Log.sinfoln(FPSTR(L_OT_HEATING), F("Set temp: %u (converted: %.2f)"), vars.parameters.heatingSetpoint, convertedTemp);
 
       // Set heating temp
-      if (ot->setHeatingCh1Temp(vars.parameters.heatingSetpoint)) {
+      if (this->instance->setHeatingCh1Temp(convertedTemp) || this->setMaxHeatingTemp(convertedTemp)) {
         currentHeatingTemp = vars.parameters.heatingSetpoint;
         this->heatingSetTempTime = millis();
 
@@ -355,7 +385,7 @@ protected:
 
       // Set heating temp to CH2
       if (settings.opentherm.heatingCh1ToCh2) {
-        if (!ot->setHeatingCh2Temp(vars.parameters.heatingSetpoint)) {
+        if (!this->instance->setHeatingCh2Temp(convertedTemp)) {
           Log.swarningln(FPSTR(L_OT_HEATING), F("Failed set ch2 temp"));
         }
       }
@@ -378,8 +408,40 @@ protected:
     }
   }
 
+  void initialize() {
+    // Not all boilers support these, only try once when the boiler becomes connected
+    if (this->updateSlaveVersion()) {
+      Log.straceln(FPSTR(L_OT), F("Slave version: %u, type: %u"), vars.parameters.slaveVersion, vars.parameters.slaveType);
+
+    } else {
+      Log.swarningln(FPSTR(L_OT), F("Get slave version failed"));
+    }
+
+    // 0x013F
+    if (this->setMasterVersion(0x3F, 0x01)) {
+      Log.straceln(FPSTR(L_OT), F("Master version: %u, type: %u"), vars.parameters.masterVersion, vars.parameters.masterType);
+      
+    } else {
+      Log.swarningln(FPSTR(L_OT), F("Set master version failed"));
+    }
+
+    if (this->updateSlaveConfig()) {
+      Log.straceln(FPSTR(L_OT), F("Slave member id: %u, flags: %u"), vars.parameters.slaveMemberId, vars.parameters.slaveFlags);
+
+    } else {
+      Log.swarningln(FPSTR(L_OT), F("Get slave config failed"));
+    }
+
+    if (this->setMasterConfig(settings.opentherm.memberIdCode & 0xFF, (settings.opentherm.memberIdCode & 0xFFFF) >> 8)) {
+      Log.straceln(FPSTR(L_OT), F("Master member id: %u, flags: %u"), vars.parameters.masterMemberId, vars.parameters.masterFlags);
+      
+    } else {
+      Log.swarningln(FPSTR(L_OT), F("Set master config failed"));
+    }
+  }
+
   bool isReady() {
-    return millis() - this->startupTime > this->readyTime;
+    return millis() - this->instanceCreatedTime > this->readyTime;
   }
 
   bool needSetDhwTemp() {
@@ -391,13 +453,13 @@ protected:
   }
 
   bool updateSlaveConfig() {
-    unsigned long response = ot->sendRequest(ot->buildRequest(
+    unsigned long response = this->instance->sendRequest(CustomOpenTherm::buildRequest(
       OpenThermRequestType::READ_DATA,
       OpenThermMessageID::SConfigSMemberIDcode,
       0
     ));
     
-    if (!ot->isValidResponse(response)) {
+    if (!CustomOpenTherm::isValidResponse(response)) {
       return false;
     }
 
@@ -452,69 +514,69 @@ protected:
       return true;
     }
 
-    unsigned long response = ot->sendRequest(ot->buildRequest(
+    unsigned long response = this->instance->sendRequest(CustomOpenTherm::buildRequest(
       OpenThermRequestType::WRITE_DATA,
       OpenThermMessageID::MConfigMMemberIDcode,
       request
     ));
 
-    return ot->isValidResponse(response);
+    return CustomOpenTherm::isValidResponse(response);
   }
 
   bool setMaxModulationLevel(byte value) {
-    unsigned long response = ot->sendRequest(ot->buildRequest(
+    unsigned long response = this->instance->sendRequest(CustomOpenTherm::buildRequest(
       OpenThermRequestType::WRITE_DATA,
       OpenThermMessageID::MaxRelModLevelSetting,
-      ot->toF88(value)
+      CustomOpenTherm::toFloat(value)
     ));
 
-    if (!ot->isValidResponse(response)) {
+    if (!CustomOpenTherm::isValidResponse(response)) {
       return false;
     }
 
-    vars.parameters.maxModulation = ot->fromF88(response);
+    vars.parameters.maxModulation = CustomOpenTherm::getFloat(response);
     return true;
   }
 
   bool updateSlaveOtVersion() {
-    unsigned long response = ot->sendRequest(ot->buildRequest(
+    unsigned long response = this->instance->sendRequest(CustomOpenTherm::buildRequest(
       OpenThermRequestType::READ_DATA,
       OpenThermMessageID::OpenThermVersionSlave,
       0
     ));
 
-    if (!ot->isValidResponse(response)) {
+    if (!CustomOpenTherm::isValidResponse(response)) {
       return false;
     }
 
-    vars.parameters.slaveOtVersion = ot->getFloat(response);
+    vars.parameters.slaveOtVersion = CustomOpenTherm::getFloat(response);
     return true;
   }
 
   bool setMasterOtVersion(float version) {
-    unsigned long response = ot->sendRequest(ot->buildRequest(
+    unsigned long response = this->instance->sendRequest(CustomOpenTherm::buildRequest(
       OpenThermRequestType::WRITE_DATA,
       OpenThermMessageID::OpenThermVersionMaster,
-      ot->toF88(version)
+      CustomOpenTherm::toFloat(version)
     ));
 
-    if (!ot->isValidResponse(response)) {
+    if (!CustomOpenTherm::isValidResponse(response)) {
       return false;
     }
 
-    vars.parameters.masterOtVersion = ot->fromF88(response);
+    vars.parameters.masterOtVersion = CustomOpenTherm::getFloat(response);
 
     return true;
   }
 
   bool updateSlaveVersion() {
-    unsigned long response = ot->sendRequest(ot->buildRequest(
+    unsigned long response = this->instance->sendRequest(CustomOpenTherm::buildRequest(
       OpenThermRequestType::READ_DATA,
       OpenThermMessageID::SlaveVersion,
       0
     ));
 
-    if (!ot->isValidResponse(response)) {
+    if (!CustomOpenTherm::isValidResponse(response)) {
       return false;
     }
 
@@ -525,13 +587,13 @@ protected:
   }
 
   bool setMasterVersion(uint8_t version, uint8_t type) {
-    unsigned long response = ot->sendRequest(ot->buildRequest(
+    unsigned long response = this->instance->sendRequest(CustomOpenTherm::buildRequest(
       OpenThermRequestType::WRITE_DATA,
       OpenThermMessageID::MasterVersion,
       (unsigned int) version | (unsigned int) type << 8
     ));
 
-    if (!ot->isValidResponse(response)) {
+    if (!CustomOpenTherm::isValidResponse(response)) {
       return false;
     }
 
@@ -542,13 +604,13 @@ protected:
   }
 
   bool updateMinMaxDhwTemp() {
-    unsigned long response = ot->sendRequest(ot->buildRequest(
+    unsigned long response = this->instance->sendRequest(CustomOpenTherm::buildRequest(
       OpenThermRequestType::READ_DATA,
       OpenThermMessageID::TdhwSetUBTdhwSetLB,
       0
     ));
 
-    if (!ot->isValidResponse(response)) {
+    if (!CustomOpenTherm::isValidResponse(response)) {
       return false;
     }
 
@@ -556,8 +618,8 @@ protected:
     byte maxTemp = (response & 0xFFFF) >> 8;
 
     if (minTemp >= 0 && maxTemp > 0 && maxTemp > minTemp) {
-      vars.parameters.dhwMinTemp = minTemp;
+      vars.parameters.dhwMinTemp = convertTemp(minTemp, settings.opentherm.unitSystem, settings.system.unitSystem);
-      vars.parameters.dhwMaxTemp = maxTemp;
+      vars.parameters.dhwMaxTemp = convertTemp(maxTemp, settings.opentherm.unitSystem, settings.system.unitSystem);
 
       return true;
     }
@@ -566,13 +628,13 @@ protected:
   }
 
   bool updateMinMaxHeatingTemp() {
-    unsigned long response = ot->sendRequest(ot->buildRequest(
+    unsigned long response = this->instance->sendRequest(CustomOpenTherm::buildRequest(
       OpenThermRequestType::READ_DATA,
       OpenThermMessageID::MaxTSetUBMaxTSetLB,
       0
     ));
 
-    if (!ot->isValidResponse(response)) {
+    if (!CustomOpenTherm::isValidResponse(response)) {
       return false;
     }
 
@@ -580,8 +642,8 @@ protected:
     byte maxTemp = (response & 0xFFFF) >> 8;
 
     if (minTemp >= 0 && maxTemp > 0 && maxTemp > minTemp) {
-      vars.parameters.heatingMinTemp = minTemp;
+      vars.parameters.heatingMinTemp = convertTemp(minTemp, settings.opentherm.unitSystem, settings.system.unitSystem);
-      vars.parameters.heatingMaxTemp = maxTemp;
+      vars.parameters.heatingMaxTemp = convertTemp(maxTemp, settings.opentherm.unitSystem, settings.system.unitSystem);
       return true;
     }
 
@@ -589,99 +651,164 @@ protected:
   }
 
   bool setMaxHeatingTemp(byte value) {
-    unsigned long response = ot->sendRequest(ot->buildRequest(
+    unsigned long response = this->instance->sendRequest(CustomOpenTherm::buildRequest(
       OpenThermMessageType::WRITE_DATA,
       OpenThermMessageID::MaxTSet,
-      ot->temperatureToData(value)
+      CustomOpenTherm::temperatureToData(value)
     ));
 
-    return ot->isValidResponse(response);
+    return CustomOpenTherm::isValidResponse(response);
   }
 
   bool updateOutsideTemp() {
-    unsigned long response = ot->sendRequest(ot->buildRequest(
+    unsigned long response = this->instance->sendRequest(CustomOpenTherm::buildRequest(
       OpenThermRequestType::READ_DATA,
       OpenThermMessageID::Toutside,
       0
     ));
 
-    if (!ot->isValidResponse(response)) {
+    if (!CustomOpenTherm::isValidResponse(response)) {
       return false;
     }
     
-    vars.temperatures.outdoor = ot->getFloat(response) + settings.sensors.outdoor.offset;
+    vars.temperatures.outdoor = settings.sensors.outdoor.offset + convertTemp(
+      CustomOpenTherm::getFloat(response),
+      settings.opentherm.unitSystem,
+      settings.system.unitSystem
+    );
+
+    return true;
+  }
+
+  bool updateExhaustTemp() {
+    unsigned long response = this->instance->sendRequest(CustomOpenTherm::buildRequest(
+      OpenThermRequestType::READ_DATA,
+      OpenThermMessageID::Texhaust,
+      0
+    ));
+
+    if (!CustomOpenTherm::isValidResponse(response)) {
+      return false;
+    }
+
+    float value = (float) CustomOpenTherm::getInt(response);
+    if (!isValidTemp(value, settings.opentherm.unitSystem, -40, 500)) {
+      return false;
+    }
+
+    vars.temperatures.exhaust = convertTemp(
+      value,
+      settings.opentherm.unitSystem,
+      settings.system.unitSystem
+    );
+
     return true;
   }
 
   bool updateHeatingTemp() {
-    unsigned long response = ot->sendRequest(ot->buildRequest(
+    unsigned long response = this->instance->sendRequest(CustomOpenTherm::buildRequest(
       OpenThermMessageType::READ_DATA,
       OpenThermMessageID::Tboiler,
       0
     ));
 
-    if (!ot->isValidResponse(response)) {
+    if (!CustomOpenTherm::isValidResponse(response)) {
       return false;
     }
 
-    float value = ot->getFloat(response);
+    float value = CustomOpenTherm::getFloat(response);
     if (value <= 0) {
       return false;
     }
 
-    vars.temperatures.heating = value;
+    vars.temperatures.heating = convertTemp(
+      value,
+      settings.opentherm.unitSystem,
+      settings.system.unitSystem
+    );
+
+    return true;
+  }
+
+  bool updateHeatingReturnTemp() {
+    unsigned long response = this->instance->sendRequest(CustomOpenTherm::buildRequest(
+      OpenThermMessageType::READ_DATA,
+      OpenThermMessageID::Tret,
+      0
+    ));
+
+    if (!CustomOpenTherm::isValidResponse(response)) {
+      return false;
+    }
+
+    vars.temperatures.heatingReturn = convertTemp(
+      CustomOpenTherm::getFloat(response),
+      settings.opentherm.unitSystem,
+      settings.system.unitSystem
+    );
+
     return true;
   }
 
 
   bool updateDhwTemp() {
-    unsigned long response = ot->sendRequest(ot->buildRequest(
+    unsigned long response = this->instance->sendRequest(CustomOpenTherm::buildRequest(
       OpenThermMessageType::READ_DATA,
       OpenThermMessageID::Tdhw,
       0
     ));
 
-    if (!ot->isValidResponse(response)) {
+    if (!CustomOpenTherm::isValidResponse(response)) {
       return false;
     }
 
-    float value = ot->getFloat(response);
+    float value = CustomOpenTherm::getFloat(response);
     if (value <= 0) {
       return false;
     }
 
-    vars.temperatures.dhw = value;
+    vars.temperatures.dhw = convertTemp(
+      value,
+      settings.opentherm.unitSystem,
+      settings.system.unitSystem
+    );
+
     return true;
   }
 
   bool updateDhwFlowRate() {
-    unsigned long response = ot->sendRequest(ot->buildRequest(
+    unsigned long response = this->instance->sendRequest(CustomOpenTherm::buildRequest(
       OpenThermMessageType::READ_DATA,
       OpenThermMessageID::DHWFlowRate,
       0
     ));
 
-    if (!ot->isValidResponse(response)) {
+    if (!CustomOpenTherm::isValidResponse(response)) {
       return false;
     }
 
-    float value = ot->getFloat(response);
+    float value = CustomOpenTherm::getFloat(response);
-    if (value > 16 && this->dhwFlowRateMultiplier != 10) {
+    if (this->dhwFlowRateMultiplier != 10 && value > convertVolume(16, UnitSystem::METRIC, settings.opentherm.unitSystem)) {
       this->dhwFlowRateMultiplier = 10;
     }
-    vars.sensors.dhwFlowRate = this->dhwFlowRateMultiplier == 1 ? value : value / this->dhwFlowRateMultiplier;
+
+    vars.sensors.dhwFlowRate = convertVolume(
+      value / this->dhwFlowRateMultiplier,
+      settings.opentherm.unitSystem,
+      settings.system.unitSystem
+    );
     
     return true;
   }
 
   bool updateFaultCode() {
-    unsigned long response = ot->sendRequest(ot->buildRequest(
+    unsigned long response = this->instance->sendRequest(CustomOpenTherm::buildRequest(
       OpenThermRequestType::READ_DATA,
       OpenThermMessageID::ASFflags,
       0
     ));
 
-    if (!ot->isValidResponse(response)) {
+    if (!CustomOpenTherm::isValidResponse(response)) {
       return false;
     }
 
@@ -690,42 +817,42 @@ protected:
   }
 
   bool updateModulationLevel() {
-    unsigned long response = ot->sendRequest(ot->buildRequest(
+    unsigned long response = this->instance->sendRequest(CustomOpenTherm::buildRequest(
       OpenThermRequestType::READ_DATA,
       OpenThermMessageID::RelModLevel,
       0
     ));
 
-    if (!ot->isValidResponse(response)) {
+    if (!CustomOpenTherm::isValidResponse(response)) {
       return false;
     }
 
-    float modulation = ot->fromF88(response);
+    vars.sensors.modulation = CustomOpenTherm::getFloat(response);
-    if (!vars.states.flame) {
-      vars.sensors.modulation = 0;
-    } else {
-      vars.sensors.modulation = modulation;
-    }
 
     return true;
   }
 
   bool updatePressure() {
-    unsigned long response = ot->sendRequest(ot->buildRequest(
+    unsigned long response = this->instance->sendRequest(CustomOpenTherm::buildRequest(
       OpenThermRequestType::READ_DATA,
       OpenThermMessageID::CHPressure,
       0
     ));
 
-    if (!ot->isValidResponse(response)) {
+    if (!CustomOpenTherm::isValidResponse(response)) {
       return false;
     }
 
-    float value = ot->getFloat(response);
+    float value = CustomOpenTherm::getFloat(response);
-    if (value > 5 && this->pressureMultiplier != 10) {
+    if (this->pressureMultiplier != 10 && value > convertPressure(5, UnitSystem::METRIC, settings.opentherm.unitSystem)) {
       this->pressureMultiplier = 10;
     }
-    vars.sensors.pressure = this->pressureMultiplier == 1 ? value : value / this->pressureMultiplier;
+
+    vars.sensors.pressure = convertPressure(
+      value / this->pressureMultiplier,
+      settings.opentherm.unitSystem,
+      settings.system.unitSystem
+    );
 
     return true;
   }

src/PortalTask.h

@@ -62,7 +62,7 @@ protected:
   }*/
 
   int getTaskPriority() {
-    return 0;
+    return 1;
   }
 
   void setup() {
@@ -434,6 +434,7 @@ protected:
       JsonDocument doc;
       varsToJson(vars, doc);
 
+      doc["system"]["unitSystem"] = static_cast<byte>(settings.system.unitSystem);
       doc["system"]["version"] = PROJECT_VERSION;
       doc["system"]["buildDate"] = __DATE__ " " __TIME__;
       doc["system"]["uptime"] = millis() / 1000ul;

src/RegulatorTask.h

@@ -69,7 +69,7 @@ protected:
       }
     }
 
-    // Ограничиваем, если до этого не ограничило
+    // Limits
     if (newTemp < settings.heating.minTemp || newTemp > settings.heating.maxTemp) {
       newTemp = constrain(newTemp, settings.heating.minTemp, settings.heating.maxTemp);
     }
@@ -84,7 +84,7 @@ protected:
     float newTemp = 0;
 
     // if use equitherm
-    if (settings.emergency.useEquitherm && settings.sensors.outdoor.type != 1) {
+    if (settings.emergency.useEquitherm && settings.sensors.outdoor.type != SensorType::MANUAL) {
       float etResult = getEquithermTemp(settings.heating.minTemp, settings.heating.maxTemp);
 
       if (fabs(prevEtResult - etResult) + 0.0001 >= 0.5) {
@@ -97,7 +97,7 @@ protected:
         newTemp += prevEtResult;
       }
 
-    } else if(settings.emergency.usePid && settings.sensors.indoor.type != 1) {
+    } else if(settings.emergency.usePid && settings.sensors.indoor.type != SensorType::MANUAL) {
       if (vars.parameters.heatingEnabled) {
         float pidResult = getPidTemp(
           settings.heating.minTemp,
@@ -182,7 +182,6 @@ protected:
     }
 
     newTemp = round(newTemp);
-    newTemp = constrain(newTemp, 0, 100);
     return newTemp;
   }
 
@@ -273,16 +272,36 @@ protected:
     }
   }
 
+  /**
+   * @brief Get the Equitherm Temp
+   * Calculations in degrees C, conversion occurs when using F
+   * 
+   * @param minTemp 
+   * @param maxTemp 
+   * @return float 
+   */
   float getEquithermTemp(int minTemp, int maxTemp) {
+    float targetTemp = vars.states.emergency ? settings.emergency.target : settings.heating.target;
+    float indoorTemp = vars.temperatures.indoor;
+    float outdoorTemp = vars.temperatures.outdoor;
+
+    if (settings.system.unitSystem == UnitSystem::IMPERIAL) {
+      minTemp = f2c(minTemp);
+      maxTemp = f2c(maxTemp);
+      targetTemp = f2c(targetTemp);
+      indoorTemp = f2c(indoorTemp);
+      outdoorTemp = f2c(outdoorTemp);
+    }
+
     if (vars.states.emergency) {
       etRegulator.Kt = 0;
       etRegulator.indoorTemp = 0;
-      etRegulator.outdoorTemp = vars.temperatures.outdoor;
+      etRegulator.outdoorTemp = outdoorTemp;
 
     } else if (settings.pid.enable) {
       etRegulator.Kt = 0;
-      etRegulator.indoorTemp = round(vars.temperatures.indoor);
+      etRegulator.indoorTemp = round(indoorTemp);
-      etRegulator.outdoorTemp = round(vars.temperatures.outdoor);
+      etRegulator.outdoorTemp = round(outdoorTemp);
 
     } else {
       if (settings.heating.turbo) {
@@ -290,17 +309,21 @@ protected:
       } else {
         etRegulator.Kt = settings.equitherm.t_factor;
       }
-      etRegulator.indoorTemp = vars.temperatures.indoor;
+      etRegulator.indoorTemp = indoorTemp;
-      etRegulator.outdoorTemp = vars.temperatures.outdoor;
+      etRegulator.outdoorTemp = outdoorTemp;
     }
 
     etRegulator.setLimits(minTemp, maxTemp);
     etRegulator.Kn = settings.equitherm.n_factor;
-    // etRegulator.Kn = tuneEquithermN(etRegulator.Kn, vars.temperatures.indoor, settings.heating.target, 300, 1800, 0.01, 1);
     etRegulator.Kk = settings.equitherm.k_factor;
-    etRegulator.targetTemp = vars.states.emergency ? settings.emergency.target : settings.heating.target;
+    etRegulator.targetTemp = targetTemp;
+    float result = etRegulator.getResult();
 
-    return etRegulator.getResult();
+    if (settings.system.unitSystem == UnitSystem::IMPERIAL) {
+      result = c2f(result);
+    }
+
+    return result;
   }
 
   float getPidTemp(int minTemp, int maxTemp) {

src/SensorsTask.h

@@ -60,39 +60,58 @@ protected:
   }
 
   void loop() {
-    bool needUpdateIndoorTemp = false;
+    bool indoorTempUpdated = false;
-    bool needUpdateOutdoorTemp = false;
+    bool outdoorTempUpdated = false;
 
-    if (settings.sensors.outdoor.type == 2 && settings.sensors.outdoor.pin) {
+    if (settings.sensors.outdoor.type == SensorType::DS18B20 && GPIO_IS_VALID(settings.sensors.indoor.gpio)) {
       outdoorTemperatureSensor();
-      needUpdateOutdoorTemp = true;
+      outdoorTempUpdated = true;
     }
 
-    if (settings.sensors.indoor.type == 2 && settings.sensors.indoor.pin) {
+    if (settings.sensors.indoor.type == SensorType::DS18B20 && GPIO_IS_VALID(settings.sensors.indoor.gpio)) {
       indoorTemperatureSensor();
-      needUpdateIndoorTemp = true;
+      indoorTempUpdated = true;
+    }
+    #if USE_BLE
+    else if (settings.sensors.indoor.type == SensorType::BLUETOOTH) {
+      indoorTemperatureBluetoothSensor();
+      indoorTempUpdated = true;
+    }
+    #endif
+
+    if (outdoorTempUpdated) {
+      float newTemp = settings.sensors.outdoor.offset;
+      if (settings.system.unitSystem == UnitSystem::METRIC) {
+        newTemp += this->filteredOutdoorTemp;
+
+      } else if (settings.system.unitSystem == UnitSystem::IMPERIAL) {
+        newTemp += c2f(this->filteredOutdoorTemp);
+      }
+
+      if (fabs(vars.temperatures.outdoor - newTemp) > 0.099) {
+        vars.temperatures.outdoor = newTemp;
+        Log.sinfoln(FPSTR(L_SENSORS_OUTDOOR), F("New temp: %f"), vars.temperatures.outdoor);
+      }
     }
 
-#if USE_BLE
+    if (indoorTempUpdated) {
-    if (settings.sensors.indoor.type == 3) {
+      float newTemp = settings.sensors.indoor.offset;
-      bluetoothSensor();
+      if (settings.system.unitSystem == UnitSystem::METRIC) {
-      needUpdateIndoorTemp = true;
+        newTemp += this->filteredIndoorTemp;
-    }
-#endif
 
-    if (needUpdateOutdoorTemp && fabs(vars.temperatures.outdoor - this->filteredOutdoorTemp) > 0.099) {
+      } else if (settings.system.unitSystem == UnitSystem::IMPERIAL) {
-      vars.temperatures.outdoor = this->filteredOutdoorTemp + settings.sensors.outdoor.offset;
+        newTemp += c2f(this->filteredIndoorTemp);
-      Log.sinfoln(FPSTR(L_SENSORS_OUTDOOR), F("New temp: %f"), vars.temperatures.outdoor);
+      }
-    }
 
-    if (needUpdateIndoorTemp && fabs(vars.temperatures.indoor - this->filteredIndoorTemp) > 0.099) {
+      if (fabs(vars.temperatures.indoor - newTemp) > 0.099) {
-      vars.temperatures.indoor = this->filteredIndoorTemp + settings.sensors.indoor.offset;
+        vars.temperatures.indoor = newTemp;
-      Log.sinfoln(FPSTR(L_SENSORS_INDOOR), F("New temp: %f"), vars.temperatures.indoor);
+        Log.sinfoln(FPSTR(L_SENSORS_INDOOR), F("New temp: %f"), vars.temperatures.indoor);
+      }
     }
   }
 
 #if USE_BLE
-  void bluetoothSensor() {
+  void indoorTemperatureBluetoothSensor() {
     static bool initBleNotify = false;
     if (!initBleSensor && millis() > 5000) {
       Log.sinfoln(FPSTR(L_SENSORS_BLE), F("Init BLE"));
@@ -210,9 +229,9 @@ protected:
 
   void outdoorTemperatureSensor() {
     if (!this->initOutdoorSensor) {
-      Log.sinfoln(FPSTR(L_SENSORS_OUTDOOR), F("Starting on gpio %hhu..."), settings.sensors.outdoor.pin);
+      Log.sinfoln(FPSTR(L_SENSORS_OUTDOOR), F("Starting on gpio %hhu..."), settings.sensors.outdoor.gpio);
 
-      this->oneWireOutdoorSensor->begin(settings.sensors.outdoor.pin);
+      this->oneWireOutdoorSensor->begin(settings.sensors.outdoor.gpio);
       this->outdoorSensor->begin();
 
       Log.straceln(
@@ -276,9 +295,9 @@ protected:
 
   void indoorTemperatureSensor() {
     if (!this->initIndoorSensor) {
-      Log.sinfoln(FPSTR(L_SENSORS_INDOOR), F("Starting on gpio %hhu..."), settings.sensors.indoor.pin);
+      Log.sinfoln(FPSTR(L_SENSORS_INDOOR), F("Starting on gpio %hhu..."), settings.sensors.indoor.gpio);
 
-      this->oneWireIndoorSensor->begin(settings.sensors.indoor.pin);
+      this->oneWireIndoorSensor->begin(settings.sensors.indoor.gpio);
       this->indoorSensor->begin();
 
       Log.straceln(

src/Settings.h

@@ -1,5 +1,5 @@
 struct NetworkSettings {
-  char hostname[25] = HOSTNAME_DEFAULT;
+  char hostname[25] = DEFAULT_HOSTNAME;
   bool useDhcp = true;
 
   struct {
@@ -10,14 +10,14 @@ struct NetworkSettings {
   } staticConfig;
 
   struct {
-    char ssid[33] = AP_SSID_DEFAULT;
+    char ssid[33] = DEFAULT_AP_SSID;
-    char password[65] = AP_PASSWORD_DEFAULT;
+    char password[65] = DEFAULT_AP_PASSWORD;
     byte channel = 6;
   } ap;
 
   struct {
-    char ssid[33] = STA_SSID_DEFAULT;
+    char ssid[33] = DEFAULT_STA_SSID;
-    char password[65] = STA_PASSWORD_DEFAULT;
+    char password[65] = DEFAULT_STA_PASSWORD;
     byte channel = 0;
   } sta;
 } networkSettings;
@@ -27,17 +27,19 @@ struct Settings {
     bool debug = DEBUG_BY_DEFAULT;
     bool useSerial = USE_SERIAL;
     bool useTelnet = USE_TELNET;
+    UnitSystem unitSystem = UnitSystem::METRIC;
   } system;
 
   struct {
     bool useAuth = false;
-    char login[13] = PORTAL_LOGIN_DEFAULT;
+    char login[13] = DEFAULT_PORTAL_LOGIN;
-    char password[33] = PORTAL_PASSWORD_DEFAULT;
+    char password[33] = DEFAULT_PORTAL_PASSWORD;
   } portal;
 
   struct {
-    byte inPin = OT_IN_PIN_DEFAULT;
+    UnitSystem unitSystem = UnitSystem::METRIC;
-    byte outPin = OT_OUT_PIN_DEFAULT;
+    byte inGpio = DEFAULT_OT_IN_GPIO;
+    byte outGpio = DEFAULT_OT_OUT_GPIO;
     unsigned int memberIdCode = 0;
     bool dhwPresent = true;
     bool summerWinterMode = false;
@@ -46,14 +48,15 @@ struct Settings {
     bool dhwToCh2 = false;
     bool dhwBlocking = false;
     bool modulationSyncWithHeating = false;
+    bool getMinMaxTemp = true;
   } opentherm;
 
   struct {
-    char server[81] = MQTT_SERVER_DEFAULT;
+    char server[81] = DEFAULT_MQTT_SERVER;
-    unsigned short port = MQTT_PORT_DEFAULT;
+    unsigned short port = DEFAULT_MQTT_PORT;
-    char user[33] = MQTT_USER_DEFAULT;
+    char user[33] = DEFAULT_MQTT_USER;
-    char password[33] = MQTT_PASSWORD_DEFAULT;
+    char password[33] = DEFAULT_MQTT_PASSWORD;
-    char prefix[33] = MQTT_PREFIX_DEFAULT;
+    char prefix[33] = DEFAULT_MQTT_PREFIX;
     unsigned short interval = 5;
   } mqtt;
 
@@ -100,16 +103,14 @@ struct Settings {
 
   struct {
     struct {
-      // 0 - boiler, 1 - manual, 2 - ds18b20
+      SensorType type = SensorType::BOILER;
-      byte type = 0;
+      byte gpio = DEFAULT_SENSOR_OUTDOOR_GPIO;
-      byte pin = SENSOR_OUTDOOR_PIN_DEFAULT;
       float offset = 0.0f;
     } outdoor;
 
     struct {
-      // 1 - manual, 2 - ds18b20, 3 - ble
+      SensorType type = SensorType::MANUAL;
-      byte type = 1;
+      byte gpio = DEFAULT_SENSOR_INDOOR_GPIO;
-      byte pin = SENSOR_INDOOR_PIN_DEFAULT;
       uint8_t bleAddresss[6] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
       float offset = 0.0f;
     } indoor;
@@ -117,7 +118,7 @@ struct Settings {
 
   struct {
     bool use = false;
-    byte pin = EXT_PUMP_PIN_DEFAULT;
+    byte gpio = DEFAULT_EXT_PUMP_GPIO;
     unsigned short postCirculationTime = 600;
     unsigned int antiStuckInterval = 2592000;
     unsigned short antiStuckTime = 300;
@@ -155,7 +156,9 @@ struct Variables {
     float indoor = 0.0f;
     float outdoor = 0.0f;
     float heating = 0.0f;
+    float heatingReturn = 0.0f;
     float dhw = 0.0f;
+    float exhaust = 0.0f;
   } temperatures;
 
   struct {

src/defines.h

@@ -1,12 +1,9 @@
 #define PROJECT_NAME                "OpenTherm Gateway"
-#define PROJECT_VERSION             "1.4.0-rc.16"
+#define PROJECT_VERSION             "1.4.0-rc.20"
 #define PROJECT_REPO                "https://github.com/Laxilef/OTGateway"
 
 #define EMERGENCY_TIME_TRESHOLD     120000
 #define MQTT_RECONNECT_INTERVAL     15000
-#define MQTT_KEEPALIVE              30
-
-#define OPENTHERM_OFFLINE_TRESHOLD  10
 
 #define EXT_SENSORS_INTERVAL        5000
 #define EXT_SENSORS_FILTER_K        0.15
@@ -14,16 +11,12 @@
 #define CONFIG_URL                  "http://%s/"
 #define SETTINGS_VALID_VALUE        "stvalid" // only 8 chars!
 
+#define GPIO_IS_NOT_CONFIGURED      0xff
 #define DEFAULT_HEATING_MIN_TEMP    20
 #define DEFAULT_HEATING_MAX_TEMP    90
 #define DEFAULT_DHW_MIN_TEMP        30
 #define DEFAULT_DHW_MAX_TEMP        60
 
-
-#ifndef WM_DEBUG_MODE
-  #define WM_DEBUG_MODE WM_DEBUG_NOTIFY
-#endif
-
 #ifndef USE_SERIAL
   #define USE_SERIAL true
 #endif
@@ -36,80 +29,98 @@
   #define USE_BLE false
 #endif
 
-#ifndef HOSTNAME_DEFAULT
+#ifndef DEFAULT_HOSTNAME
-  #define HOSTNAME_DEFAULT "opentherm"
+  #define DEFAULT_HOSTNAME "opentherm"
 #endif
 
-#ifndef AP_SSID_DEFAULT
+#ifndef DEFAULT_AP_SSID
-  #define AP_SSID_DEFAULT "OpenTherm Gateway"
+  #define DEFAULT_AP_SSID "OpenTherm Gateway"
 #endif
 
-#ifndef AP_PASSWORD_DEFAULT
+#ifndef DEFAULT_AP_PASSWORD
-  #define AP_PASSWORD_DEFAULT "otgateway123456"
+  #define DEFAULT_AP_PASSWORD "otgateway123456"
 #endif
 
-#ifndef STA_SSID_DEFAULT
+#ifndef DEFAULT_STA_SSID
-  #define STA_SSID_DEFAULT ""
+  #define DEFAULT_STA_SSID ""
 #endif
 
-#ifndef STA_PASSWORD_DEFAULT
+#ifndef DEFAULT_STA_PASSWORD
-  #define STA_PASSWORD_DEFAULT ""
+  #define DEFAULT_STA_PASSWORD ""
 #endif
 
 #ifndef DEBUG_BY_DEFAULT
   #define DEBUG_BY_DEFAULT false
 #endif
 
-#ifndef PORTAL_LOGIN_DEFAULT
+#ifndef DEFAULT_PORTAL_LOGIN
-  #define PORTAL_LOGIN_DEFAULT ""
+  #define DEFAULT_PORTAL_LOGIN ""
 #endif
 
-#ifndef PORTAL_PASSWORD_DEFAULT
+#ifndef DEFAULT_PORTAL_PASSWORD
-  #define PORTAL_PASSWORD_DEFAULT ""
+  #define DEFAULT_PORTAL_PASSWORD ""
 #endif
 
-#ifndef MQTT_SERVER_DEFAULT
+#ifndef DEFAULT_MQTT_SERVER
-  #define MQTT_SERVER_DEFAULT ""
+  #define DEFAULT_MQTT_SERVER ""
 #endif
 
-#ifndef MQTT_PORT_DEFAULT
+#ifndef DEFAULT_MQTT_PORT
-  #define MQTT_PORT_DEFAULT 1883
+  #define DEFAULT_MQTT_PORT 1883
 #endif
 
-#ifndef MQTT_USER_DEFAULT
+#ifndef DEFAULT_MQTT_USER
-  #define MQTT_USER_DEFAULT ""
+  #define DEFAULT_MQTT_USER ""
 #endif
 
-#ifndef MQTT_PASSWORD_DEFAULT
+#ifndef DEFAULT_MQTT_PASSWORD
-  #define MQTT_PASSWORD_DEFAULT ""
+  #define DEFAULT_MQTT_PASSWORD ""
 #endif
 
-#ifndef MQTT_PREFIX_DEFAULT
+#ifndef DEFAULT_MQTT_PREFIX
-  #define MQTT_PREFIX_DEFAULT "opentherm"
+  #define DEFAULT_MQTT_PREFIX "opentherm"
 #endif
 
-#ifndef OT_IN_PIN_DEFAULT
+#ifndef DEFAULT_OT_IN_GPIO
-  #define OT_IN_PIN_DEFAULT 0
+  #define DEFAULT_OT_IN_GPIO GPIO_IS_NOT_CONFIGURED
 #endif
 
-#ifndef OT_OUT_PIN_DEFAULT
+#ifndef DEFAULT_OT_OUT_GPIO
-  #define OT_OUT_PIN_DEFAULT 0
+  #define DEFAULT_OT_OUT_GPIO GPIO_IS_NOT_CONFIGURED
 #endif
 
-#ifndef SENSOR_OUTDOOR_PIN_DEFAULT
+#ifndef DEFAULT_SENSOR_OUTDOOR_GPIO
-  #define SENSOR_OUTDOOR_PIN_DEFAULT 0
+  #define DEFAULT_SENSOR_OUTDOOR_GPIO GPIO_IS_NOT_CONFIGURED
 #endif
 
-#ifndef SENSOR_INDOOR_PIN_DEFAULT
+#ifndef DEFAULT_SENSOR_INDOOR_GPIO
-  #define SENSOR_INDOOR_PIN_DEFAULT 0
+  #define DEFAULT_SENSOR_INDOOR_GPIO GPIO_IS_NOT_CONFIGURED
 #endif
 
-#ifndef EXT_PUMP_PIN_DEFAULT
+#ifndef DEFAULT_EXT_PUMP_GPIO
-  #define EXT_PUMP_PIN_DEFAULT 0
+  #define DEFAULT_EXT_PUMP_GPIO GPIO_IS_NOT_CONFIGURED
 #endif
 
 #ifndef PROGMEM
   #define PROGMEM 
 #endif
 
+#ifndef GPIO_IS_VALID_GPIO
+  #define GPIO_IS_VALID_GPIO(gpioNum) (gpioNum >= 0 && gpioNum <= 16)
+#endif
+
+#define GPIO_IS_VALID(gpioNum) (gpioNum != GPIO_IS_NOT_CONFIGURED && GPIO_IS_VALID_GPIO(gpioNum))
+
+enum class SensorType : byte {
+  BOILER,
+  MANUAL,
+  DS18B20,
+  BLUETOOTH
+};
+
+enum class UnitSystem : byte {
+  METRIC,
+  IMPERIAL
+};
+
 char buffer[255];

src/main.cpp

@@ -143,7 +143,7 @@ void setup() {
   tMqtt = new MqttTask(false, 500);
   Scheduler.start(tMqtt);
 
-  tOt = new OpenThermTask(false, 750);
+  tOt = new OpenThermTask(true, 750);
   Scheduler.start(tOt);
 
   tSensors = new SensorsTask(true, EXT_SENSORS_INTERVAL);

src/utils.h

@@ -1,5 +1,74 @@
 #include <Arduino.h>
 
+inline float liter2gallon(float value) {
+  return value / 4.546091879f;
+}
+
+inline float gallon2liter(float value) {
+  return value * 4.546091879f;
+}
+
+float convertVolume(float value, const UnitSystem unitFrom, const UnitSystem unitTo) {
+  if (unitFrom == UnitSystem::METRIC && unitTo == UnitSystem::IMPERIAL) {
+    value = liter2gallon(value);
+    
+  } else if (unitFrom == UnitSystem::IMPERIAL && unitTo == UnitSystem::METRIC) {
+    value = gallon2liter(value);
+  }
+
+  return value;
+}
+
+inline float bar2psi(float value) {
+  return value * 14.5038f;
+}
+
+inline float psi2bar(float value) {
+  return value / 14.5038f;
+}
+
+float convertPressure(float value, const UnitSystem unitFrom, const UnitSystem unitTo) {
+  if (unitFrom == UnitSystem::METRIC && unitTo == UnitSystem::IMPERIAL) {
+    value = bar2psi(value);
+    
+  } else if (unitFrom == UnitSystem::IMPERIAL && unitTo == UnitSystem::METRIC) {
+    value = psi2bar(value);
+  }
+
+  return value;
+}
+
+inline float c2f(float value) {
+  return (9.0f / 5.0f) * value + 32.0f;
+}
+
+inline float f2c(float value) {
+  return (value - 32.0f) * (5.0f / 9.0f);
+}
+
+float convertTemp(float value, const UnitSystem unitFrom, const UnitSystem unitTo) {
+  if (unitFrom == UnitSystem::METRIC && unitTo == UnitSystem::IMPERIAL) {
+    value = c2f(value);
+    
+  } else if (unitFrom == UnitSystem::IMPERIAL && unitTo == UnitSystem::METRIC) {
+    value = f2c(value);
+  }
+
+  return value;
+}
+
+bool isValidTemp(const float value, UnitSystem unit, const float min = 0.1f, const float max = 99.9f) {
+  if (unit == UnitSystem::METRIC) {
+    return value >= min && value <= max;
+
+  } else if (unit == UnitSystem::IMPERIAL) {
+    return value >= c2f(min) && value <= c2f(max);
+
+  } else {
+    return false;
+  }
+}
+
 double roundd(double value, uint8_t decimals = 2) {
   if (decimals == 0) {
     return (int)(value + 0.5);
@@ -13,7 +82,7 @@ double roundd(double value, uint8_t decimals = 2) {
   return (int)(value * multiplier) / multiplier;
 }
 
-size_t getTotalHeap() {
+inline size_t getTotalHeap() {
   #if defined(ARDUINO_ARCH_ESP32)
   return ESP.getHeapSize();
   #elif defined(ARDUINO_ARCH_ESP8266)
@@ -63,7 +132,7 @@ size_t getMaxFreeBlockHeap(bool getMinValue = false) {
   return getMinValue ? minValue : value;
 }
 
-uint8_t getHeapFrag() {
+inline uint8_t getHeapFrag() {
   return 100 - getMaxFreeBlockHeap() * 100.0 / getFreeHeap();
 }
 
@@ -268,13 +337,15 @@ void settingsToJson(const Settings& src, JsonVariant dst, bool safe = false) {
     dst["system"]["debug"] = src.system.debug;
     dst["system"]["useSerial"] = src.system.useSerial;
     dst["system"]["useTelnet"] = src.system.useTelnet;
+    dst["system"]["unitSystem"] = static_cast<byte>(src.system.unitSystem);
 
     dst["portal"]["useAuth"] = src.portal.useAuth;
     dst["portal"]["login"] = src.portal.login;
     dst["portal"]["password"] = src.portal.password;
 
-    dst["opentherm"]["inPin"] = src.opentherm.inPin;
+    dst["opentherm"]["unitSystem"] = static_cast<byte>(src.opentherm.unitSystem);
-    dst["opentherm"]["outPin"] = src.opentherm.outPin;
+    dst["opentherm"]["inGpio"] = src.opentherm.inGpio;
+    dst["opentherm"]["outGpio"] = src.opentherm.outGpio;
     dst["opentherm"]["memberIdCode"] = src.opentherm.memberIdCode;
     dst["opentherm"]["dhwPresent"] = src.opentherm.dhwPresent;
     dst["opentherm"]["summerWinterMode"] = src.opentherm.summerWinterMode;
@@ -283,6 +354,7 @@ void settingsToJson(const Settings& src, JsonVariant dst, bool safe = false) {
     dst["opentherm"]["dhwToCh2"] = src.opentherm.dhwToCh2;
     dst["opentherm"]["dhwBlocking"] = src.opentherm.dhwBlocking;
     dst["opentherm"]["modulationSyncWithHeating"] = src.opentherm.modulationSyncWithHeating;
+    dst["opentherm"]["getMinMaxTemp"] = src.opentherm.getMinMaxTemp;
 
     dst["mqtt"]["server"] = src.mqtt.server;
     dst["mqtt"]["port"] = src.mqtt.port;
@@ -323,12 +395,12 @@ void settingsToJson(const Settings& src, JsonVariant dst, bool safe = false) {
   dst["equitherm"]["k_factor"] = roundd(src.equitherm.k_factor, 3);
   dst["equitherm"]["t_factor"] = roundd(src.equitherm.t_factor, 3);
 
-  dst["sensors"]["outdoor"]["type"] = src.sensors.outdoor.type;
+  dst["sensors"]["outdoor"]["type"] = static_cast<byte>(src.sensors.outdoor.type);
-  dst["sensors"]["outdoor"]["pin"] = src.sensors.outdoor.pin;
+  dst["sensors"]["outdoor"]["gpio"] = src.sensors.outdoor.gpio;
   dst["sensors"]["outdoor"]["offset"] = roundd(src.sensors.outdoor.offset, 2);
 
-  dst["sensors"]["indoor"]["type"] = src.sensors.indoor.type;
+  dst["sensors"]["indoor"]["type"] = static_cast<byte>(src.sensors.indoor.type);
-  dst["sensors"]["indoor"]["pin"] = src.sensors.indoor.pin;
+  dst["sensors"]["indoor"]["gpio"] = src.sensors.indoor.gpio;
 
   char bleAddress[18];
   sprintf(
@@ -346,7 +418,7 @@ void settingsToJson(const Settings& src, JsonVariant dst, bool safe = false) {
 
   if (!safe) {
     dst["externalPump"]["use"] = src.externalPump.use;
-    dst["externalPump"]["pin"] = src.externalPump.pin;
+    dst["externalPump"]["gpio"] = src.externalPump.gpio;
     dst["externalPump"]["postCirculationTime"] = roundd(src.externalPump.postCirculationTime / 60, 0);
     dst["externalPump"]["antiStuckInterval"] = roundd(src.externalPump.antiStuckInterval / 86400, 0);
     dst["externalPump"]["antiStuckTime"] = roundd(src.externalPump.antiStuckTime / 60, 0);
@@ -377,6 +449,39 @@ bool jsonToSettings(const JsonVariantConst src, Settings& dst, bool safe = false
       changed = true;
     }
 
+    if (!src["system"]["unitSystem"].isNull()) {
+      byte value = src["system"]["unitSystem"].as<unsigned char>();
+      UnitSystem prevUnitSystem = dst.system.unitSystem;
+
+      switch (value) {
+        case static_cast<byte>(UnitSystem::METRIC):
+          dst.system.unitSystem = UnitSystem::METRIC;
+          changed = true;
+          break;
+
+        case static_cast<byte>(UnitSystem::IMPERIAL):
+          dst.system.unitSystem = UnitSystem::IMPERIAL;
+          changed = true;
+          break;
+
+        default:
+          break;
+      }
+
+      // convert temps
+      if (dst.system.unitSystem != prevUnitSystem) {
+        dst.emergency.target = convertTemp(dst.emergency.target, prevUnitSystem, dst.system.unitSystem);
+        dst.heating.target = convertTemp(dst.heating.target, prevUnitSystem, dst.system.unitSystem);
+        dst.heating.minTemp = convertTemp(dst.heating.minTemp, prevUnitSystem, dst.system.unitSystem);
+        dst.heating.maxTemp = convertTemp(dst.heating.maxTemp, prevUnitSystem, dst.system.unitSystem);
+        dst.dhw.target = convertTemp(dst.dhw.target, prevUnitSystem, dst.system.unitSystem);
+        dst.dhw.minTemp = convertTemp(dst.dhw.minTemp, prevUnitSystem, dst.system.unitSystem);
+        dst.dhw.maxTemp = convertTemp(dst.dhw.maxTemp, prevUnitSystem, dst.system.unitSystem);
+        dst.pid.minTemp = convertTemp(dst.pid.minTemp, prevUnitSystem, dst.system.unitSystem);
+        dst.pid.maxTemp = convertTemp(dst.pid.maxTemp, prevUnitSystem, dst.system.unitSystem);
+      }
+    }
+
 
     // portal
     if (src["portal"]["useAuth"].is<bool>()) {
@@ -404,21 +509,56 @@ bool jsonToSettings(const JsonVariantConst src, Settings& dst, bool safe = false
 
 
     // opentherm
-    if (!src["opentherm"]["inPin"].isNull()) {
+    if (!src["opentherm"]["unitSystem"].isNull()) {
-      unsigned char value = src["opentherm"]["inPin"].as<unsigned char>();
+      byte value = src["opentherm"]["unitSystem"].as<unsigned char>();
 
-      if (value >= 0 && value < 50) {
+      switch (value) {
-        dst.opentherm.inPin = value;
+        case static_cast<byte>(UnitSystem::METRIC):
-        changed = true;
+          dst.opentherm.unitSystem = UnitSystem::METRIC;
+          changed = true;
+          break;
+
+        case static_cast<byte>(UnitSystem::IMPERIAL):
+          dst.opentherm.unitSystem = UnitSystem::IMPERIAL;
+          changed = true;
+          break;
+
+        default:
+          break;
       }
     }
 
-    if (!src["opentherm"]["outPin"].isNull()) {
+    if (!src["opentherm"]["inGpio"].isNull()) {
-      unsigned char value = src["opentherm"]["outPin"].as<unsigned char>();
+      if (src["opentherm"]["inGpio"].is<JsonString>() && src["opentherm"]["inGpio"].as<JsonString>().size() == 0) {
+        if (dst.opentherm.inGpio != GPIO_IS_NOT_CONFIGURED) {
+          dst.opentherm.inGpio = GPIO_IS_NOT_CONFIGURED;
+          changed = true;
+        }
         
-      if (value >= 0 && value < 50) {
+      } else {
-        dst.opentherm.outPin = value;
+        unsigned char value = src["opentherm"]["inGpio"].as<unsigned char>();
-        changed = true;
+
+        if (value >= 0 && value <= 254) {
+          dst.opentherm.inGpio = value;
+          changed = true;
+        }
+      }
+    }
+    
+    if (!src["opentherm"]["outGpio"].isNull()) {
+      if (src["opentherm"]["outGpio"].is<JsonString>() && src["opentherm"]["outGpio"].as<JsonString>().size() == 0) {
+        if (dst.opentherm.outGpio != GPIO_IS_NOT_CONFIGURED) {
+          dst.opentherm.outGpio = GPIO_IS_NOT_CONFIGURED;
+          changed = true;
+        }
+        
+      } else {
+        unsigned char value = src["opentherm"]["outGpio"].as<unsigned char>();
+
+        if (value >= 0 && value <= 254) {
+          dst.opentherm.outGpio = value;
+          changed = true;
+        }
       }
     }
 
@@ -484,6 +624,11 @@ bool jsonToSettings(const JsonVariantConst src, Settings& dst, bool safe = false
       changed = true;
     }
 
+    if (src["opentherm"]["getMinMaxTemp"].is<bool>()) {
+      dst.opentherm.getMinMaxTemp = src["opentherm"]["getMinMaxTemp"].as<bool>();
+      changed = true;
+    }
+
 
     // mqtt
     if (!src["mqtt"]["server"].isNull()) {
@@ -551,14 +696,14 @@ bool jsonToSettings(const JsonVariantConst src, Settings& dst, bool safe = false
   if (!src["emergency"]["target"].isNull()) {
     double value = src["emergency"]["target"].as<double>();
 
-    if (value > 0 && value < 100) {
+    if (isValidTemp(value, dst.system.unitSystem)) {
       dst.emergency.target = roundd(value, 2);
       changed = true;
     }
   }
 
   if (src["emergency"]["useEquitherm"].is<bool>()) {
-    if (dst.sensors.outdoor.type != 1) {
+    if (dst.sensors.outdoor.type != SensorType::MANUAL) {
       dst.emergency.useEquitherm = src["emergency"]["useEquitherm"].as<bool>();
 
     } else {
@@ -573,7 +718,7 @@ bool jsonToSettings(const JsonVariantConst src, Settings& dst, bool safe = false
   }
 
   if (src["emergency"]["usePid"].is<bool>()) {
-    if (dst.sensors.indoor.type != 1) {
+    if (dst.sensors.indoor.type != SensorType::MANUAL) {
       dst.emergency.usePid = src["emergency"]["usePid"].as<bool>();
 
     } else {
@@ -602,7 +747,7 @@ bool jsonToSettings(const JsonVariantConst src, Settings& dst, bool safe = false
   if (!src["heating"]["target"].isNull()) {
     double value = src["heating"]["target"].as<double>();
 
-    if (value > 0 && value < 100) {
+    if (isValidTemp(value, dst.system.unitSystem)) {
       dst.heating.target = roundd(value, 2);
       changed = true;
     }
@@ -654,7 +799,7 @@ bool jsonToSettings(const JsonVariantConst src, Settings& dst, bool safe = false
   if (!src["dhw"]["target"].isNull()) {
     unsigned char value = src["dhw"]["target"].as<unsigned char>();
 
-    if (value >= 0 && value < 100) {
+    if (isValidTemp(value, dst.system.unitSystem)) {
       dst.dhw.target = value;
       changed = true;
     }
@@ -724,7 +869,7 @@ bool jsonToSettings(const JsonVariantConst src, Settings& dst, bool safe = false
   if (!src["pid"]["maxTemp"].isNull()) {
     unsigned char value = src["pid"]["maxTemp"].as<unsigned char>();
 
-    if (value > 0 && value <= 100 && value > dst.pid.minTemp) {
+    if (isValidTemp(value, dst.system.unitSystem) && value > dst.pid.minTemp) {
       dst.pid.maxTemp = value;
       changed = true;
     }
@@ -733,7 +878,7 @@ bool jsonToSettings(const JsonVariantConst src, Settings& dst, bool safe = false
   if (!src["pid"]["minTemp"].isNull()) {
     unsigned char value = src["pid"]["minTemp"].as<unsigned char>();
 
-    if (value >= 0 && value < 100 && value < dst.pid.maxTemp) {
+    if (isValidTemp(value, dst.system.unitSystem) && value < dst.pid.maxTemp) {
       dst.pid.minTemp = value;
       changed = true;
     }
@@ -776,25 +921,44 @@ bool jsonToSettings(const JsonVariantConst src, Settings& dst, bool safe = false
 
   // sensors
   if (!src["sensors"]["outdoor"]["type"].isNull()) {
-    unsigned char value = src["sensors"]["outdoor"]["type"].as<unsigned char>();
+    byte value = src["sensors"]["outdoor"]["type"].as<unsigned char>();
 
-    if (value >= 0 && value <= 2) {
+    switch (value) {
-      dst.sensors.outdoor.type = value;
+      case static_cast<byte>(SensorType::BOILER):
+        dst.sensors.outdoor.type = SensorType::BOILER;
+        changed = true;
+        break;
 
-      if (dst.sensors.outdoor.type == 1) {
+      case static_cast<byte>(SensorType::MANUAL):
+        dst.sensors.outdoor.type = SensorType::MANUAL;
         dst.emergency.useEquitherm = false;
-      }
+        changed = true;
+        break;
 
-      changed = true;
+      case static_cast<byte>(SensorType::DS18B20):
+        dst.sensors.outdoor.type = SensorType::DS18B20;
+        changed = true;
+        break;
+
+      default:
+        break;
     }
   }
 
-  if (!src["sensors"]["outdoor"]["pin"].isNull()) {
+  if (!src["sensors"]["outdoor"]["gpio"].isNull()) {
-    unsigned char value = src["sensors"]["outdoor"]["pin"].as<unsigned char>();
+    if (src["sensors"]["outdoor"]["gpio"].is<JsonString>() && src["sensors"]["outdoor"]["gpio"].as<JsonString>().size() == 0) {
+      if (dst.sensors.outdoor.gpio != GPIO_IS_NOT_CONFIGURED) {
+        dst.sensors.outdoor.gpio = GPIO_IS_NOT_CONFIGURED;
+        changed = true;
+      }
       
-    if (value >= 0 && value <= 50) {
+    } else {
-      dst.sensors.outdoor.pin = value;
+      unsigned char value = src["sensors"]["outdoor"]["gpio"].as<unsigned char>();
-      changed = true;
+
+      if (value >= 0 && value <= 254) {
+        dst.sensors.outdoor.gpio = value;
+        changed = true;
+      }
     }
   }
 
@@ -808,25 +972,52 @@ bool jsonToSettings(const JsonVariantConst src, Settings& dst, bool safe = false
   }
 
   if (!src["sensors"]["indoor"]["type"].isNull()) {
-    unsigned char value = src["sensors"]["indoor"]["type"].as<unsigned char>();
+    byte value = src["sensors"]["indoor"]["type"].as<unsigned char>();
 
-    if (value >= 1 && value <= 3) {
-      dst.sensors.indoor.type = value;
 
-      if (dst.sensors.indoor.type == 1) {
+    switch (value) {
-        dst.emergency.usePid = false;
+      case static_cast<byte>(SensorType::BOILER):
-      }
+        dst.sensors.indoor.type = SensorType::BOILER;
+        changed = true;
+        break;
 
-      changed = true;
+      case static_cast<byte>(SensorType::MANUAL):
+        dst.sensors.indoor.type = SensorType::MANUAL;
+        dst.emergency.useEquitherm = false;
+        changed = true;
+        break;
+
+      case static_cast<byte>(SensorType::DS18B20):
+        dst.sensors.indoor.type = SensorType::DS18B20;
+        changed = true;
+        break;
+
+      #if USE_BLE
+      case static_cast<byte>(SensorType::BLUETOOTH):
+        dst.sensors.indoor.type = SensorType::BLUETOOTH;
+        changed = true;
+        break;
+      #endif
+
+      default:
+        break;
     }
   }
 
-  if (!src["sensors"]["indoor"]["pin"].isNull()) {
+  if (!src["sensors"]["indoor"]["gpio"].isNull()) {
-    unsigned char value = src["sensors"]["indoor"]["pin"].as<unsigned char>();
+    if (src["sensors"]["indoor"]["gpio"].is<JsonString>() && src["sensors"]["indoor"]["gpio"].as<JsonString>().size() == 0) {
+      if (dst.sensors.indoor.gpio != GPIO_IS_NOT_CONFIGURED) {
+        dst.sensors.indoor.gpio = GPIO_IS_NOT_CONFIGURED;
+        changed = true;
+      }
       
-    if (value >= 0 && value <= 50) {
+    } else {
-      dst.sensors.indoor.pin = value;
+      unsigned char value = src["sensors"]["indoor"]["gpio"].as<unsigned char>();
-      changed = true;
+      
+      if (value >= 0 && value <= 254) {
+        dst.sensors.indoor.gpio = value;
+        changed = true;
+      }
     }
   }
 
@@ -861,12 +1052,20 @@ bool jsonToSettings(const JsonVariantConst src, Settings& dst, bool safe = false
       changed = true;
     }
 
-    if (!src["externalPump"]["pin"].isNull()) {
+    if (!src["externalPump"]["gpio"].isNull()) {
-      unsigned char value = src["externalPump"]["pin"].as<unsigned char>();
+      if (src["externalPump"]["gpio"].is<JsonString>() && src["externalPump"]["gpio"].as<JsonString>().size() == 0) {
+        if (dst.externalPump.gpio != GPIO_IS_NOT_CONFIGURED) {
+          dst.externalPump.gpio = GPIO_IS_NOT_CONFIGURED;
+          changed = true;
+        }
         
-      if (value >= 0 && value <= 50) {
+      } else {
-        dst.externalPump.pin = value;
+        unsigned char value = src["externalPump"]["gpio"].as<unsigned char>();
-        changed = true;
+
+        if (value >= 0 && value <= 254) {
+          dst.externalPump.gpio = value;
+          changed = true;
+        }
       }
     }
 
@@ -928,7 +1127,9 @@ void varsToJson(const Variables& src, JsonVariant dst) {
   dst["temperatures"]["indoor"] = roundd(src.temperatures.indoor, 2);
   dst["temperatures"]["outdoor"] = roundd(src.temperatures.outdoor, 2);
   dst["temperatures"]["heating"] = roundd(src.temperatures.heating, 2);
+  dst["temperatures"]["heatingReturn"] = roundd(src.temperatures.heatingReturn, 2);
   dst["temperatures"]["dhw"] = roundd(src.temperatures.dhw, 2);
+  dst["temperatures"]["exhaust"] = roundd(src.temperatures.exhaust, 2);
 
   dst["parameters"]["heatingEnabled"] = src.parameters.heatingEnabled;
   dst["parameters"]["heatingMinTemp"] = src.parameters.heatingMinTemp;
@@ -961,7 +1162,7 @@ bool jsonToVars(const JsonVariantConst src, Variables& dst) {
   if (!src["temperatures"]["indoor"].isNull()) {
     double value = src["temperatures"]["indoor"].as<double>();
 
-    if (settings.sensors.indoor.type == 1 && value > -100 && value < 100) {
+    if (settings.sensors.indoor.type == SensorType::MANUAL && isValidTemp(value, settings.system.unitSystem, -99.9f, 99.9f)) {
       dst.temperatures.indoor = roundd(value, 2);
       changed = true;
     }
@@ -970,7 +1171,7 @@ bool jsonToVars(const JsonVariantConst src, Variables& dst) {
   if (!src["temperatures"]["outdoor"].isNull()) {
     double value = src["temperatures"]["outdoor"].as<double>();
 
-    if (settings.sensors.outdoor.type == 1 && value > -100 && value < 100) {
+    if (settings.sensors.outdoor.type == SensorType::MANUAL && isValidTemp(value, settings.system.unitSystem, -99.9f, 99.9f)) {
       dst.temperatures.outdoor = roundd(value, 2);
       changed = true;
     }

src_data/static/app.js

@@ -484,6 +484,7 @@ async function loadSettings() {
   setCheckboxValue('.system-debug', result.system.debug);
   setCheckboxValue('.system-use-serial', result.system.useSerial);
   setCheckboxValue('.system-use-telnet', result.system.useTelnet);
+  setRadioValue('.system-unit-system', result.system.unitSystem);
   setBusy('#system-settings-busy', '#system-settings', false);
 
   setCheckboxValue('.portal-use-auth', result.portal.useAuth);
@@ -491,8 +492,9 @@ async function loadSettings() {
   setInputValue('.portal-password', result.portal.password);
   setBusy('#portal-settings-busy', '#portal-settings', false);
 
-  setInputValue('.opentherm-in-pin', result.opentherm.inPin);
+  setRadioValue('.opentherm-unit-system', result.opentherm.unitSystem);
-  setInputValue('.opentherm-out-pin', result.opentherm.outPin);
+  setInputValue('.opentherm-in-gpio', result.opentherm.inGpio < 255 ? result.opentherm.inGpio : '');
+  setInputValue('.opentherm-out-gpio', result.opentherm.outGpio < 255 ? result.opentherm.outGpio : '');
   setInputValue('.opentherm-member-id-code', result.opentherm.memberIdCode);
   setCheckboxValue('.opentherm-dhw-present', result.opentherm.dhwPresent);
   setCheckboxValue('.opentherm-sw-mode', result.opentherm.summerWinterMode);
@@ -501,6 +503,7 @@ async function loadSettings() {
   setCheckboxValue('.opentherm-dhw-to-ch2', result.opentherm.dhwToCh2);
   setCheckboxValue('.opentherm-dhw-blocking', result.opentherm.dhwBlocking);
   setCheckboxValue('.opentherm-sync-modulation-with-heating', result.opentherm.modulationSyncWithHeating);
+  setCheckboxValue('.opentherm-get-min-max-temp', result.opentherm.getMinMaxTemp);
   setBusy('#opentherm-settings-busy', '#opentherm-settings', false);
 
   setInputValue('.mqtt-server', result.mqtt.server);
@@ -512,18 +515,18 @@ async function loadSettings() {
   setBusy('#mqtt-settings-busy', '#mqtt-settings', false);
 
   setRadioValue('.outdoor-sensor-type', result.sensors.outdoor.type);
-  setInputValue('.outdoor-sensor-pin', result.sensors.outdoor.pin);
+  setInputValue('.outdoor-sensor-gpio', result.sensors.outdoor.gpio  < 255 ? result.sensors.outdoor.gpio : '');
   setInputValue('.outdoor-sensor-offset', result.sensors.outdoor.offset);
   setBusy('#outdoor-sensor-settings-busy', '#outdoor-sensor-settings', false);
 
   setRadioValue('.indoor-sensor-type', result.sensors.indoor.type);
-  setInputValue('.indoor-sensor-pin', result.sensors.indoor.pin);
+  setInputValue('.indoor-sensor-gpio', result.sensors.indoor.gpio < 255 ? result.sensors.indoor.gpio : '');
   setInputValue('.indoor-sensor-offset', result.sensors.indoor.offset);
   setInputValue('.indoor-sensor-ble-addresss', result.sensors.indoor.bleAddresss);
   setBusy('#indoor-sensor-settings-busy', '#indoor-sensor-settings', false);
 
   setCheckboxValue('.extpump-use', result.externalPump.use);
-  setInputValue('.extpump-pin', result.externalPump.pin);
+  setInputValue('.extpump-gpio', result.externalPump.gpio < 255 ? result.externalPump.gpio : '');
   setInputValue('.extpump-pc-time', result.externalPump.postCirculationTime);
   setInputValue('.extpump-as-interval', result.externalPump.antiStuckInterval);
   setInputValue('.extpump-as-time', result.externalPump.antiStuckTime);
@@ -534,6 +537,27 @@ async function loadVars() {
   let response = await fetch('/api/vars');
   let result = await response.json();
 
+  let tempUnitStr, pressureUnitStr, volumeUnitStr;
+  switch (result.system.unitSystem) {
+    case 0:
+      tempUnitStr = 'C';
+      pressureUnitStr = 'bar';
+      volumeUnitStr = 'L';
+      break;
+
+    case 1:
+      tempUnitStr = 'F';
+      pressureUnitStr = 'psi';
+      volumeUnitStr = 'gal';
+      break;
+
+    default:
+      tempUnitStr = '?';
+      pressureUnitStr = '?';
+      volumeUnitStr = '?';
+      break;
+  }
+
   setState('.ot-connected', result.states.otStatus);
   setState('.ot-emergency', result.states.emergency);
   setState('.ot-heating', result.states.heating);
@@ -552,10 +576,15 @@ async function loadVars() {
   setValue('.outdoor-temp', result.temperatures.outdoor);
   setValue('.heating-temp', result.temperatures.heating);
   setValue('.heating-setpoint-temp', result.parameters.heatingSetpoint);
+  setValue('.heating-return-temp', result.temperatures.heatingReturn);
   setValue('.dhw-temp', result.temperatures.dhw);
+  setValue('.exhaust-temp', result.temperatures.exhaust);
 
   setBusy('.ot-busy', '.ot-table', false);
 
+  setValue('.temp-unit', tempUnitStr);
+  setValue('.pressure-unit', pressureUnitStr);
+  setValue('.volume-unit', volumeUnitStr);
   setValue('.version', result.system.version);
   setValue('.build-date', result.system.buildDate);
   setValue('.uptime', result.system.uptime);
@@ -601,12 +630,14 @@ function setState(selector, value) {
 }
 
 function setValue(selector, value) {
-  let item = document.querySelector(selector);
+  let items = document.querySelectorAll(selector);
-  if (!item) {
+  if (!items.length) {
     return;
   }
 
-  item.innerHTML = value;
+  for (let item of items) {
+    item.innerHTML = value;
+  }
 }
 
 function setCheckboxValue(selector, value) {