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First of all, I don't think those casts ( (my_robot::GripperState::Request &)
) before the _2
and _3
are necessary.
But, most importantly, I think you're numbering your arguments incorrectly. _2
should be _1
and _3
should be _2
. Those underscored arguments refer to the args passed to the boost functor returned by boost::bind
; so having 2 and 3 implies that it's receiving 3 arguments and it should ignore the first. When, in reality, ROS only passes it two arguments (the request and the response).