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Always have to ask the basics to make sure they don't apply! So, Have you run this:

rosrun rosserial_python /dev/ttyUSB0

after roscore is started? Can you list your rosservices? Topics?

Also, it would be good to verify the port that you communicate through. For me, it seemed to change from /dev/ttyUSB0 to /dev/ttyACM0 to /dev/ttyACM1 and back again (not in that order, it was quite unpredictable). You might also want to adjust your baud rate when connecting.

Also, consider the limitations of rosserial. I had trouble with that. I could not publish information from an IMU due to these limitations.