MQTTv3.1.1 supports a zero-byte clientId during authentication #900
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l2063610646
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Bug:
According to the MQTT v3.1.1 protocol specification, MQTT clients can send connect messages without specifying the client ID. This is not a feature exclusive to MQTTV5, it should also exist in MQTTv3.1.1.
I think brokers should generate random clientId instead of failing authentication.
