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Well first of all, you publish at /multimaster/chatter
and you're saying you get nothing while listening to /multimaster_chatter
which are in fact different topics.
Another problem could be that there is never anything published at /points_map
so the callback function is never called.
The third option I can think of is that chat_
isn't properly defined in your class and is therefore not the same variable in your constructor as your callback function.