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If you are running on two machines in distributed fashion first be sure that ROS connectivity is fully working. It's important to test both directions, i.e. to make sure publishing and subscribing works. See this Q/A for some info in case it does not.

If ROS connectivity works, the next thing to look out for are time sync issues between both machines. See for instance this Q/A.

Another reason for things not working could be overloading the wireless network (i.e. if you try to transmit too much data).