fix broker rest interface

ml/thing.py

@@ -394,20 +394,21 @@ def __connect_with_broker(self):
         )
         if self.__is_broker_rest:
             self.broker = BrokerREST(token=self.access_token)
-
             def receive():
+                self.__endpoint = find_broker_endpoint(self.dir, thing_id=self.thing_id)
                 while True:
                     try:
                         time.sleep(0.1)
-                        msg_str = self.broker.receive_once(self.__endpoint)
-                        if msg_str == "":
+                        msg = self.broker.receive_once(self.__endpoint)
+                        msg_to_json = lambda msg: msg if isinstance(msg, dict) else json.loads(msg)
+                        if msg == {}:
                             continue
                         else:
                             self.__on_broker_callback(
                                 ch=None,
                                 method=None,
                                 properties=None,
-                                body=json.loads(msg_str),
+                                body=msg_to_json(msg),
                             )
                     except:
                         continue
@@ -453,7 +454,8 @@ def __on_broker_callback(self, ch, method, properties, body):
         elif isinstance(body, str):
             pass
 
-        self.broker.receiver.acknowledge_message(method.delivery_tag)
+        if ch is not None:
+            ch.basic_ack(method.delivery_tag)
         try:
             message_type = body.get("messageType")
             if message_type == "userMessage":