[ERROR] [1560968878.473622]: Lost sync with device, restarting...
[INFO] [1560968878.475121]: Requesting topics...
[WARN] [1560968878.498287]: Last read step: data checksum
[WARN] [1560968878.499542]: Run loop error: [Errno 104] Connection reset by peer
[INFO] [1560968878.510628]: Removing subscriber: /hero_0/cmd_vel
[INFO] [1560968878.512802]: Removing subscriber: /hero_0/motor
[INFO] [1560968878.514852]: Shutting down
[INFO] [1560968878.515763]: All done
Traceback (most recent call last):
  File "/opt/ros/melodic/lib/rosserial_python/serial_node.py", line 73, in <module>
    server.listen()
  File "/opt/ros/melodic/lib/python2.7/dist-packages/rosserial_python/SerialClient.py", line 253, in listen
    self.startSerialClient()
  File "/opt/ros/melodic/lib/python2.7/dist-packages/rosserial_python/SerialClient.py", line 259, in startSerialClient
    client.run()
  File "/opt/ros/melodic/lib/python2.7/dist-packages/rosserial_python/SerialClient.py", line 556, in run
    self.port.flushOutput()
AttributeError: RosSerialServer instance has no attribute 'flushOutput'