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ef475fa9d8
This fixes the case where the mixer_module would subscribe and use its own test_motor publication which was created only to make sure the topic is advertised and subsequent updates will work properly. This happened in SITL lockstep because the timestamp would be 0 at the very beginning, and hence elapsed time would be 0 as well. This lead to an actuator publication which would then get lockstep out of sync causing poll errors on the Gazebo side.