[Bug]: Broken pipe when listening over tcp for events from meshtasticd (solved: blanking screen crashes meshtasticd)

[bmidgley]

Category

Other

Hardware

Linux Native

Firmware Version

2.5.15

Description

If I use the tcp listener from https://github.com/brad28b/meshtastic-cli-receive-text/blob/main/read_messages_tcp.py it gets stuck every once in a while, crashing in a background thread apparently. I can't rescue it and once it crashes, no events will be received.

bmidgley@nightvision:~ $ meshtastic --version
2.5.9
bmidgley@nightvision:~ $ python --version
Python 3.11.2
bmidgley@nightvision:~ $ dpkg -l | grep meshtastic
ii  meshtasticd                          2.5.15.79da236                      arm64        Native Linux Meshtastic binary.

Exception in thread Thread-4:
Traceback (most recent call last):
  File "/usr/lib/python3.11/threading.py", line 1038, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.11/threading.py", line 1394, in run
    self.function(*self.args, **self.kwargs)
  File "/home/bmidgley/env/lib/python3.11/site-packages/meshtastic/mesh_interface.py", line 1062, in callback
    self.sendHeartbeat()
  File "/home/bmidgley/env/lib/python3.11/site-packages/meshtastic/mesh_interface.py", line 1051, in sendHeartbeat
    self._sendToRadio(p)
  File "/home/bmidgley/env/lib/python3.11/site-packages/meshtastic/mesh_interface.py", line 1126, in _sendToRadio
    self._sendToRadioImpl(toRadio)
  File "/home/bmidgley/env/lib/python3.11/site-packages/meshtastic/stream_interface.py", line 120, in _sendToRadioImpl
    self._writeBytes(header + b)
  File "/home/bmidgley/env/lib/python3.11/site-packages/meshtastic/tcp_interface.py", line 79, in _writeBytes
    self.socket.send(b)
BrokenPipeError: [Errno 32] Broken pipe

Relevant log output

No response

[bmidgley]

If I knew the exception had happened, I could restart my connection or exit the script. But it keeps running as if nothing is wrong.

[bmidgley]

Ok I've lost the exact log message, but I believe it was saying it would blank the screen, then crashed and restarted meshtasticd. I was still configured for a 2.8" waveshare screen. I think the blanking operation is dangerous with the configured and not present screen.

Removing the screen from the config is avoiding the crash.

I'm ok if you want to close or combine or whatever since the ticket has taken a turn.

[bmidgley]

I'm seeing this crash even when the screen is present

[migillett]

I'm seeing this error too. Here's my log error.

meshtastic_listener    | Traceback (most recent call last):
meshtastic_listener    |   File "/usr/local/lib/python3.13/threading.py", line 1041, in _bootstrap_inner
meshtastic_listener    |     self.run()
meshtastic_listener    |     ~~~~~~~~^^
meshtastic_listener    |   File "/usr/local/lib/python3.13/threading.py", line 1342, in run
meshtastic_listener    |     self.function(*self.args, **self.kwargs)
meshtastic_listener    |     ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^
meshtastic_listener    |   File "/root/.cache/pypoetry/virtualenvs/meshtatic-listener-c8hN_e31-py3.13/lib/python3.13/site-package                            s/meshtastic/mesh_interface.py", line 1063, in callback
meshtastic_listener    |     self.sendHeartbeat()
meshtastic_listener    |     ~~~~~~~~~~~~~~~~~~^^
meshtastic_listener    |   File "/root/.cache/pypoetry/virtualenvs/meshtatic-listener-c8hN_e31-py3.13/lib/python3.13/site-package                            s/meshtastic/mesh_interface.py", line 1052, in sendHeartbeat
meshtastic_listener    |     self._sendToRadio(p)
meshtastic_listener    |     ~~~~~~~~~~~~~~~~~^^^
meshtastic_listener    |   File "/root/.cache/pypoetry/virtualenvs/meshtatic-listener-c8hN_e31-py3.13/lib/python3.13/site-package                            s/meshtastic/mesh_interface.py", line 1127, in _sendToRadio
meshtastic_listener    |     self._sendToRadioImpl(toRadio)
meshtastic_listener    |     ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
meshtastic_listener    |   File "/root/.cache/pypoetry/virtualenvs/meshtatic-listener-c8hN_e31-py3.13/lib/python3.13/site-package                            s/meshtastic/stream_interface.py", line 120, in _sendToRadioImpl
meshtastic_listener    |     self._writeBytes(header + b)
meshtastic_listener    |     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^
meshtastic_listener    |   File "/root/.cache/pypoetry/virtualenvs/meshtatic-listener-c8hN_e31-py3.13/lib/python3.13/site-package                            s/meshtastic/tcp_interface.py", line 79, in _writeBytes
meshtastic_listener    |     self.socket.send(b)
meshtastic_listener    |     ~~~~~~~~~~~~~~~~^^^
meshtastic_listener    | BrokenPipeError: [Errno 32] Broken pipe

[migillett]

A potential answer for this is my host machine going to sleep while the script is running.

Edit: update. It's not. Ran this on Ubuntu server as a docker container and still got a broken pipe error.