fix methods on 3.4, 3.5 (#100)

Author: BertKleewein

azure-iot-device/azure/iot/device/iothub/pipeline/pipeline_stages_iothub_mqtt.py

@@ -157,7 +157,9 @@ def _handle_pipeline_event(self, event):
                 rid = mqtt_topic_iothub.get_method_request_id_from_topic(topic)
                 method_name = mqtt_topic_iothub.get_method_name_from_topic(topic)
                 method_received = MethodRequest(
-                    request_id=rid, name=method_name, payload=json.loads(event.payload)
+                    request_id=rid,
+                    name=method_name,
+                    payload=json.loads(event.payload.decode("utf-8")),
                 )
                 self.handle_pipeline_event(pipeline_events_iothub.MethodRequest(method_received))
 

azure-iot-device/tests/iothub/pipeline/test_pipeline_stages_iothub_mqtt.py

@@ -79,7 +79,7 @@
 fake_method_request_topic = "$iothub/methods/POST/{}/?$rid={}".format(
     fake_method_name, fake_request_id
 )
-fake_method_request_payload = "{}"
+fake_method_request_payload = "{}".encode("utf-8")
 
 
 api_version = "2018-06-30"
@@ -702,4 +702,6 @@ def test_puts_mqtt_payload_in_method_request_payload(
     ):
         stage.handle_pipeline_event(method_request_event)
         new_event = stage.previous.handle_pipeline_event.call_args[0][0]
-        assert new_event.method_request.payload == json.loads(fake_method_request_payload)
+        assert new_event.method_request.payload == json.loads(
+            fake_method_request_payload.decode("utf-8")
+        )