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I believe that the message "wrong checksum for topic id and msg" indicates the real problem. This usually occurs when your headers files checksum definition in ROS are different from the rosserial client versions. It should be solved by running the rosserial_client make_library command again in ROS and update it on rosserial client side. The "Lost sync with device, restarting..." occurs with me as well and I am still looking for an answer for that, although the communication works properly with this messages.