api: implement automatic mqtt reconnect in ccujack cron

api/src/dooris_api/ccujack.py

@@ -162,9 +162,12 @@ class CCUJackClient:
         while True:
             try:
 
-                await asyncio.sleep(60 * 60) # 1 hour
+                await asyncio.sleep(15 * 60) # 15 minutes
                 logger.info("Running CCUJack cron")
                 await self.find_locks()
+                if not self.mqtt.is_connected():
+                    logger.warning("MQTT client was discovered to be disconnected; reconnecting now")
+                    await self.mqtt.connect()
 
             except Exception as e:
                 logger.exception(f"Error in CCUJack cron task: {e}")

api/src/dooris_api/mqtt_client.py

@@ -154,8 +154,16 @@ class AsyncMqttClient:
 
         await self.fut_connected
 
+        # re-establish all supposed mqtt subscriptions
+        if len(self.active_subscriptions > 0):
+            qos = 1
+            await self.client.subscribe((i, qos) for i in self.active_subscriptions)
+
     async def disconnect(self):
         logger.info("Disconnecting mqtt client from broker")
         self.fut_disconnect = asyncio.get_running_loop().create_future()
         self.client.disconnect()
         await self.fut_disconnect
+
+    def is_connected(self) -> bool:
+        return self.client.is_connected()