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Actually, I can use "connection.addHandler('/a',function(msg) {.....});" to get msg from topic /a .
And what I want is to use msg from both topic /a and topic /b in the same handler.

I'm not sure there's any way to use msg from two topics in one handler.

By the way, using your example I found that rsp is "OK" but not the msg from topic, so what does the rsp's content mean? just subscribe is successful?

Thank you for your kindness!