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MQTT 5.0: Authentication with only password does not work with mosquitto_pub. #1274
The MQTT version 5.0 specification allows a client to send a password
Copied from the specification:
"This version of the protocol allows the sending of a Password with no
A warning is printed if a password is given but no user name. The password is not sent to the broker.
The command works when both user name and password are given.