Crashes on client connection: `io.UnsupportedOperation: fileno`

[sigurdo]

Python version: 3.10.11

I am currently trying to use ser2tcp to forward a COM port on Windows to WSL2 over TCP, but the connection crashes with the following error as soon as I connect the client:

ser2tcp.exe -c .\ser2tcp_config.json
Traceback (most recent call last):
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.10_3.10.3056.0_x64__qbz5n2kfra8p0\lib\runpy.py", line 196, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.10_3.10.3056.0_x64__qbz5n2kfra8p0\lib\runpy.py", line 86, in _run_code
    exec(code, run_globals)
  File "C:\Users\sigur\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\Scripts\ser2tcp.exe\__main__.py", line 7, in <module>
  File "C:\Users\sigur\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\ser2tcp\main.py", line 53, in main
    servers_manager.process()
  File "C:\Users\sigur\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\ser2tcp\server_manager.py", line 20, in process
    read_sockets = _select.select(sockets, [], [], .1)[0]
io.UnsupportedOperation: fileno

Here is my config:

[
    {
        "serial": {
            "port": "COM7",
            "baudrate": 57600,
            "parity": "NONE",
            "stopbits": "ONE"
        },
        "servers": [
            {
                "address": "127.0.0.1",
                "port": 10001,
                "protocol": "TCP"
            },
            {
                "address": "0.0.0.0",
                "port": 10002,
                "protocol": "TELNET"
            },
            {
                "address": "172.29.176.1",
                "port": 10003,
                "protocol": "TCP"
            }
        ]
    }
]

172.29.176.1 is the IP address of Windows on the Windows-WSL2 ethernet adapter.

On the WSL side I use socat to forward TCP to a virtual COM port with the following command:

sudo socat  pty,link=/dev/virtualcom0,raw  tcp:172.29.176.1:10003

socat returns with no error message and no error code. I know nothing about socat, just copied the command from this stackoverflow post, so I might very well be using it wrong. Does anyone know what I might be doing wrong, or if there could be a bug in ser2tcp?

[xingguang777]

Did you solve this issues ? This error occured on my window 10 and python 3.11 too ?It might be caused by the version of python

[bcm56504]

The windows system does not support ‘select’, I am not sure how to handle it. You can try starting a separate thread to monitor and read data from the serial port. This may solve the problem, I guess