Fix on mqtt disconnect

Author: marianards

src/isar/services/service_connections/mqtt/mqtt_client.py

@@ -106,16 +106,22 @@ def run(self) -> None:
             )
 
     def on_connect(self, client, userdata, flags, reason_code, properties):
-        self.logger.info(
-            "Connection returned result: " + mqtt.connack_string(reason_code)
+        self.logger.info(f"Connected: {reason_code}")
+
+    def on_disconnect(self, client, userdata, *args):
+        if len(args) == 1:
+            reason_code = args[0]
+        elif len(args) == 2:
+            reason_code, _ = args
+        elif len(args) == 3:
+            _, reason_code, _ = args
+        else:
+            reason_code = None
+
+        self.logger.warning(
+            f"Unexpected disconnection from MQTT Broker: {reason_code}."
         )
 
-    def on_disconnect(self, client, userdata, reason_code, properties):
-        if reason_code != 0:
-            self.logger.warning(
-                f"Unexpected disconnection from MQTT Broker, {reason_code}"
-            )
-
     @backoff.on_exception(
         backoff.expo,
         ConnectionRefusedError,