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You need to use message_filters.TimeSynchronizer for this. Please look at the example code in the documentation: http://wiki.ros.org/message_filters#Example_.28Python.29-1

Please note that the is also the ApproximateTime synchronization, which is often what you want if the sensor time stamps are not exactly in sync.

You need to use message_filters.TimeSynchronizer for this. Please look at the example code in the documentation: http://wiki.ros.org/message_filters#Example_.28Python.29-1

Please note that the there is also the ApproximateTime synchronization, which is often what you want if the sensor time stamps are not exactly in sync.