Both of them have no authentication.
What is the difference between both of them?
ALLJOYN_SRP_KEYX does provide authentication via the pre-shared password between the two authenticating applications.
ALLJOYN_ECDHE_NULL do not provide any authentication.
ANONYMOUS is used between two routing nodes. For two applications authenticating with each other using null authentication,
ALLJOYN_ECDHE_NULL is used.
Reference: AllJoyn Security
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