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Subject: Two factor authentication.
Originally asked on SO: http://iot.stackexchange.com/q/496/185
I think, there should be an optional field for the factor (integer; 0 = no authentication, 1 = username and password as currently supported, 2 = second factor of authentication, etc.) of authentication followed by values corresponding to the given factor of authentication.
A client sends connect message with the factor of authentication and the values corresponding to he factor. The broker responds with CONNACK corresponding to the factor of authentication.
Regards,
Nagesh
Sent from tablet. Pardon brevity, grammar mistakes or typos.
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