the boiler app now use mqtt instead of relying on an automation on ha side

apps/boilerwatchdog.py

@@ -0,0 +1,42 @@
+"""Independent AppDaemon worker monitoring the boiler climate heartbeat."""
+import time
+
+import appdaemon.plugins.hass.hassapi as hass
+from logger_interface import LoggerInterface
+from boilerregulator import finite
+
+
+class BoilerWatchdog(hass.Hass, LoggerInterface):
+    def initialize(self):
+        self.initialize_logger_interface(self.get_ad_api(), ascii_encode=False)
+        self.base = self.args.get('mqtt_topic', 'appdaemon/radiator_heating').rstrip('/')
+        self.mqtt_namespace = self.args.get('mqtt_namespace', 'mqtt')
+        self.timeout = finite(self.args.get('heartbeat_timeout', 180))
+        if self.timeout < 60:
+            raise ValueError('heartbeat_timeout must be at least 60 seconds')
+        if self.AD.plugins.get_plugin_object(self.mqtt_namespace) is None:
+            raise RuntimeError('MQTT plugin missing; configure it and restart AppDaemon')
+        self.last_heartbeat = None
+        self.fault = False
+        self.listen_event(self._mqtt_event, 'MQTT_MESSAGE', namespace=self.mqtt_namespace)
+        self.run_every(self._check, 'now', 10)
+        self._check()
+
+    def _mqtt_event(self, event, data, kwargs):
+        if data.get('topic') == self.base + '/heartbeat':
+            self.last_heartbeat = time.monotonic()
+            if self.fault:
+                self.log_info('Boiler climate heartbeat recovered')
+            self.fault = False
+        elif data.get('topic') is None and data.get('state') == 'Connected':
+            self.last_heartbeat = None
+            self.fault = False
+            self._check()
+
+    def _check(self, kwargs=None):
+        if self.last_heartbeat is None or time.monotonic() - self.last_heartbeat >= self.timeout:
+            if not self.fault:
+                self.call_service('mqtt/publish', namespace=self.mqtt_namespace,
+                                  topic=self.base + '/availability', payload='offline', qos=0, retain=True)
+                self.log_warning('Boiler climate unavailable: waiting for a fresh heartbeat')
+                self.fault = True