Error - no attribute 'flushoutput'

[remintz-acn]

When running

$ rosrun rosserial_python serial_node.py tcp

and the device (NodeMCU) is reset

I get the following

[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'

[Saums]

I'm receiving the same error. Did you find a solution?

[Koraze]

I work on ROS Melodic on Raspberry Pi 4 with Raspbian Buster.

I also got the same issue, so I remove code around line 556 in SerialClient.py

with self.write_lock:
     self.port.flushOutput()

It's seems to work now ... I hope those lines weren't so important ...

[mbilsky]

On line 281 flushInput() is defined, so I pasted a similar definition right below:

def flushInput(self):
    pass

def flushOutput(self):
    pass

I initially thought it may be because flushInput/flushOutput are depreciated from pyserial (now called reset_output_buffer() ): https://pythonhosted.org/pyserial/pyserial_api.html#serial.Serial.reset_output_buffer

I'm running pyserial 3.4. This change didn't help so I just created the blank definition above and it seems to work robustly enough.