Remove initialisation warning from the boiler

apps/boilerwatchdog.py

@@ -17,7 +17,9 @@ class BoilerWatchdog(hass.Hass, LoggerInterface):
         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.waiting_since = time.monotonic()
         self.fault = False
+        self.warned = False
         self.listen_event(self._mqtt_event, 'MQTT_MESSAGE', namespace=self.mqtt_namespace)
         self.run_every(self._check, 'now', 10)
         self._check()
@@ -25,18 +27,24 @@ class BoilerWatchdog(hass.Hass, LoggerInterface):
     def _mqtt_event(self, event, data, kwargs):
         if data.get('topic') == self.base + '/heartbeat':
             self.last_heartbeat = time.monotonic()
-            if self.fault:
+            if self.warned:
                 self.log_info('Boiler climate heartbeat recovered')
             self.fault = False
+            self.warned = False
         elif data.get('topic') is None and data.get('state') == 'Connected':
             self.last_heartbeat = None
+            self.waiting_since = time.monotonic()
             self.fault = False
+            self.warned = False
             self._check()
 
     def _check(self, kwargs=None):
-        if self.last_heartbeat is None or time.monotonic() - self.last_heartbeat >= self.timeout:
+        age = time.monotonic() - (self.waiting_since if self.last_heartbeat is None else self.last_heartbeat)
+        if self.last_heartbeat is None or age >= 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
+            if age >= self.timeout and not self.warned:
+                self.log_warning('Boiler climate unavailable: no heartbeat within the timeout')
+                self.warned = True