MQTT server sending a message to a client declaring unauthorization

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So, there's this MQTT client that sends a CONNECT packet the MQTT broker with a username and the password. 

If the client is not authorized to connect, the broker closes the connection. 

Since the CONNACK packet does not allow any payloads, I was wondering how the MQTT broker tells the client that the reason for closing the connection is no authorization.

Apr 25, 2019 in IoT (Internet of Things) by Shubham
• 13,490 points
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1 answer to this question.

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It would return a CONNACK packet with the Connect Return code set to 5. 

Refer section 3.2.2.3 of the MQTT v3.1.1 spec.

http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.html#_Toc398718033

answered Apr 25, 2019 by Upasana
• 8,620 points

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