Azure IoT Hub Sending messages using Python via mqtt

0 votes

So, I created IoT hub, device, topic and subscription post setting up my Azure. Now I want to send a message via mqtt using a python script. What should I do to see it on the azure page? 

This is my code.

def on_connect(client, userdata, flags, rc):
  print ("Device connected with result code: " + str(rc))
def on_disconnect(client, userdata, rc):
  print ("Device disconnected with result code: " + str(rc))
def on_publish(client, userdata, mid):
  print ("Device sent message")

client = mqtt.Client(client_id=device_id, protocol=mqtt.MQTTv311)

client.on_connect = on_connect
client.on_disconnect = on_disconnect
client.on_publish = on_publish

client.username_pw_set(username=iot_hub_name+".azure-devices.net/" + device_id, password=sas_token)

client.tls_set(certfile=None, keyfile=None, cert_reqs=ssl.CERT_REQUIRED, tls_version=ssl.PROTOCOL_TLSv1, ciphers=None)
client.tls_insecure_set(False)

client.connect(iot_hub_name+".azure-devices.net", port=8883)

client.publish("devices/" + device_id + "/messages/events/", "{id=123}", qos=1)
client.loop_forever()

The issue being, I don't know how to specify the topic.

client.publish("devices/" + device_id + "/mytopicname/messages", "{id=123}", qos=1)

This thing I tried disconnects with code 1.

Jan 4, 2019 in IoT (Internet of Things) by Shubham
• 13,490 points
3,379 views

1 answer to this question.

0 votes

The thing is that IoT Hub is not a general-purpose pub-sub messaging broker. It's meant to support only the documented topic names and filters. 

Try reading this doc (Communicate with your IoT hub using the MQTT protocol).

Hope this helps!!

If you need to know more about Azure, enroll with Microsoft Azure training course today.

Thank you!!

answered Jan 4, 2019 by Upasana
• 8,620 points

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