umqtt.simple: allow no password in connect packet #302
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The
umqtt.simple.MQTTClient
incorrectly assumes that if the user is set, the password is notNone
. If password is set toNone
, the password flag in the connect headers should not be set and no password should be sent to the server.Further discussion here: https://forum.micropython.org/viewtopic.php?p=29636#p29598