feat: added opentherm option 'immergasFix'

src/OpenThermTask.h

@@ -165,6 +165,16 @@ protected:
       heatingCh2Enabled = settings.opentherm.dhwPresent && settings.dhw.enable;
     }
 
+    // Set boiler status LB
+    // Some boilers require this, although this is against protocol
+    uint8_t statusLb = 0;
+
+    // Immergas fix
+    // https://arduino.ru/forum/programmirovanie/termostat-opentherm-na-esp8266?page=15#comment-649392
+    if (settings.opentherm.immergasFix) {
+      statusLb = 0xCA;
+    }
+
     unsigned long response = this->instance->setBoilerStatus(
       heatingEnabled,
       settings.opentherm.dhwPresent && settings.dhw.enable,
@@ -172,7 +182,8 @@ protected:
       settings.opentherm.nativeHeatingControl,
       heatingCh2Enabled,
       settings.opentherm.summerWinterMode,
-      settings.opentherm.dhwBlocking
+      settings.opentherm.dhwBlocking,
+      statusLb
     );
 
     if (!CustomOpenTherm::isValidResponse(response)) {

src/Settings.h

@@ -63,6 +63,7 @@ struct Settings {
     bool modulationSyncWithHeating = false;
     bool getMinMaxTemp = true;
     bool nativeHeatingControl = false;
+    bool immergasFix = false;
   } opentherm;
 
   struct {

src/utils.h

@@ -354,6 +354,7 @@ void settingsToJson(const Settings& src, JsonVariant dst, bool safe = false) {
     dst["opentherm"]["modulationSyncWithHeating"] = src.opentherm.modulationSyncWithHeating;
     dst["opentherm"]["getMinMaxTemp"] = src.opentherm.getMinMaxTemp;
     dst["opentherm"]["nativeHeatingControl"] = src.opentherm.nativeHeatingControl;
+    dst["opentherm"]["immergasFix"] = src.opentherm.immergasFix;
 
     dst["mqtt"]["enable"] = src.mqtt.enable;
     dst["mqtt"]["server"] = src.mqtt.server;
@@ -800,6 +801,15 @@ bool jsonToSettings(const JsonVariantConst src, Settings& dst, bool safe = false
       }
     }
 
+    if (src["opentherm"]["immergasFix"].is<bool>()) {
+      bool value = src["opentherm"]["immergasFix"].as<bool>();
+
+      if (value != dst.opentherm.immergasFix) {
+        dst.opentherm.immergasFix = value;
+        changed = true;
+      }
+    }
+
 
     // mqtt
     if (src["mqtt"]["enable"].is<bool>()) {