zmq.error.ZMQError: Operation cannot be accomplished in current state

[gnthibault]

I have this issue randomly thrown at me. I am doing tests on both a x86 machine and a aarch64 raspberry pi, and it seems the issue is almost triggered 100% of the time on the raspberry pi:

Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/lib/python3.8/threading.py", line 932, in _bootstrap_inner
    self.run()
  File "/home/user/test.py", line 125, in apply_rotation
    self.view3D[f"test/test0"].set_transform(
  File "/home/user/venv/lib/python3.8/site-packages/meshcat/visualizer.py", line 152, in set_transform
    return self.window.send(SetTransform(matrix, self.path))
  File "/home/user/venv/lib/python3.8/site-packages/meshcat/visualizer.py", line 58, in send
    self.zmq_socket.send_multipart([
  File "/home/user/venv/lib/python3.8/site-packages/zmq/sugar/socket.py", line 595, in send_multipart
    self.send(msg, SNDMORE | flags, copy=copy, track=track)
  File "/home/user/venv/lib/python3.8/site-packages/zmq/sugar/socket.py", line 547, in send
    return super(Socket, self).send(data, flags=flags, copy=copy, track=track)
  File "zmq/backend/cython/socket.pyx", line 718, in zmq.backend.cython.socket.Socket.send
  File "zmq/backend/cython/socket.pyx", line 765, in zmq.backend.cython.socket.Socket.send
  File "zmq/backend/cython/socket.pyx", line 247, in zmq.backend.cython.socket._send_copy
  File "zmq/backend/cython/socket.pyx", line 242, in zmq.backend.cython.socket._send_copy
  File "zmq/backend/cython/checkrc.pxd", line 28, in zmq.backend.cython.checkrc._check_rc
zmq.error.ZMQError: Operation cannot be accomplished in current state

The code is not really relevant, as it is sometimes working, sometimes not. The error arise on a SetTransform than is ran on a separate thread from the thread that creates the meshcat.Visualizer()

Sorry for the poor bug reporting, but it is very hard to find a mwe

[gnthibault]

Some elements:
https://stackoverflow.com/questions/41009900/python-zmq-operation-cannot-be-accomplished-in-current-state

[gnthibault]

It's sad that this issue prevent from using callback ran in external threads to update the 3d model.