Small mqtt refactor

mqtt.py

@@ -5,7 +5,7 @@ import paho.mqtt.client as mqtt
 class MqttClient:
   def __init__(self, config):
     self._config = config
-    self._mqttc = mqtt.Client()
+    self._mqttc = mqtt.Client(client_id='bt-mqtt-gateway', clean_session=False)
 
   def publish(self, messages):
     if messages is None:

workers_manager.py

@@ -98,4 +98,5 @@ class WorkersManager:
       pip.main(['install', '-q', package])
 
   def _on_command_wrapper(self, worker_obj, client, _, c):
+    _LOGGER.debug("on command wrapper for with %s: %s", c.topic, c.payload)
     self._queue_command(self.Command(worker_obj.on_command, [c.topic, c.payload]))