asyncio.exceptions.TimeoutError

[M1ghty-boy]

Windows 11 23H2 25915
Python 3.8.5

Unsure if this first part is a part of the issue or my cat panda printer not being supported, but first off it can't find my device automatically, and when selecting it manually it spits this out after a second, and prints do not work:

----------------------------------------
Exception happened during processing of request from ('127.0.0.1', 61839)
Traceback (most recent call last):
  File "C:\ProgramData\Anaconda3\lib\socketserver.py", line 316, in _handle_request_noblock
    self.process_request(request, client_address)
  File "C:\ProgramData\Anaconda3\lib\socketserver.py", line 347, in process_request
    self.finish_request(request, client_address)
  File "server.py", line 331, in finish_request
    self.handler.__init__(request, client_address, self)
  File "C:\ProgramData\Anaconda3\lib\socketserver.py", line 720, in __init__
    self.handle()
  File "C:\ProgramData\Anaconda3\lib\http\server.py", line 427, in handle
    self.handle_one_request()
  File "server.py", line 104, in handle_one_request
    super().handle_one_request()
  File "C:\ProgramData\Anaconda3\lib\http\server.py", line 415, in handle_one_request
    method()
  File "server.py", line 273, in do_POST
    self.handle_api()
  File "server.py", line 248, in handle_api
    self.printer.connect(name, address)
  File "D:\takeout\cat-printer-bare-0.6.3.0\cat-printer\printer.py", line 356, in connect
    self.loop(
  File "D:\takeout\cat-printer-bare-0.6.3.0\cat-printer\printer.py", line 327, in loop
    results.append(self._loop.run_until_complete(future))
  File "C:\ProgramData\Anaconda3\lib\asyncio\base_events.py", line 616, in run_until_complete
    return future.result()
  File "C:\ProgramData\Anaconda3\lib\site-packages\bleak\backends\winrt\client.py", line 249, in connect
    await asyncio.wait_for(event.wait(), timeout=timeout)
  File "C:\ProgramData\Anaconda3\lib\asyncio\tasks.py", line 490, in wait_for
    raise exceptions.TimeoutError()
asyncio.exceptions.TimeoutError
----------------------------------------
----------------------------------------
Exception happened during processing of request from ('127.0.0.1', 61850)
Traceback (most recent call last):
  File "C:\ProgramData\Anaconda3\lib\socketserver.py", line 316, in _handle_request_noblock
    self.process_request(request, client_address)
  File "C:\ProgramData\Anaconda3\lib\socketserver.py", line 347, in process_request
    self.finish_request(request, client_address)
  File "server.py", line 331, in finish_request
    self.handler.__init__(request, client_address, self)
  File "C:\ProgramData\Anaconda3\lib\socketserver.py", line 720, in __init__
    self.handle()
  File "C:\ProgramData\Anaconda3\lib\http\server.py", line 427, in handle
    self.handle_one_request()
  File "server.py", line 104, in handle_one_request
    super().handle_one_request()
  File "C:\ProgramData\Anaconda3\lib\http\server.py", line 415, in handle_one_request
    method()
  File "server.py", line 273, in do_POST
    self.handle_api()
  File "server.py", line 248, in handle_api
    self.printer.connect(name, address)
  File "D:\takeout\cat-printer-bare-0.6.3.0\cat-printer\printer.py", line 356, in connect
    self.loop(
  File "D:\takeout\cat-printer-bare-0.6.3.0\cat-printer\printer.py", line 327, in loop
    results.append(self._loop.run_until_complete(future))
  File "C:\ProgramData\Anaconda3\lib\asyncio\base_events.py", line 616, in run_until_complete
    return future.result()
  File "C:\ProgramData\Anaconda3\lib\site-packages\bleak\backends\winrt\client.py", line 249, in connect
    await asyncio.wait_for(event.wait(), timeout=timeout)
  File "C:\ProgramData\Anaconda3\lib\asyncio\tasks.py", line 490, in wait_for
    raise exceptions.TimeoutError()
asyncio.exceptions.TimeoutError
----------------------------------------
Traceback (most recent call last):
  File "server.py", line 367, in <module>
    serve()
  File "server.py", line 362, in serve
    server.serve_forever()
  File "C:\ProgramData\Anaconda3\lib\socketserver.py", line 237, in serve_forever
    self._handle_request_noblock()
  File "C:\ProgramData\Anaconda3\lib\socketserver.py", line 316, in _handle_request_noblock
    self.process_request(request, client_address)
  File "C:\ProgramData\Anaconda3\lib\socketserver.py", line 347, in process_request
    self.finish_request(request, client_address)
  File "server.py", line 331, in finish_request
    self.handler.__init__(request, client_address, self)
  File "C:\ProgramData\Anaconda3\lib\socketserver.py", line 720, in __init__
    self.handle()
  File "C:\ProgramData\Anaconda3\lib\http\server.py", line 427, in handle
    self.handle_one_request()
  File "server.py", line 104, in handle_one_request
    super().handle_one_request()
  File "C:\ProgramData\Anaconda3\lib\http\server.py", line 415, in handle_one_request
    method()
  File "server.py", line 273, in do_POST
    self.handle_api()
  File "server.py", line 248, in handle_api
    self.printer.connect(name, address)
  File "D:\takeout\cat-printer-bare-0.6.3.0\cat-printer\printer.py", line 356, in connect
    self.loop(
  File "D:\takeout\cat-printer-bare-0.6.3.0\cat-printer\printer.py", line 327, in loop
    results.append(self._loop.run_until_complete(future))
  File "C:\ProgramData\Anaconda3\lib\asyncio\base_events.py", line 616, in run_until_complete
    return future.result()
asyncio.exceptions.CancelledError

[M1ghty-boy]

This issue occured both on the latest build and when running server.py after cloning the main branch

[NaitLee]

This part of the stack trace:

File "server.py", line 248, in handle_api
    self.printer.connect(name, address)

tells that it timed out while connecting to the printer.

I can’t tell of your printer model is supported yet. Such thermal printers differs a lot, though all under similar colorful shell.

For Cat-Printer, the way telling if a device is supported is not well designed from today’s view: It should inspect the device’s parameters instead (BLE services, and/or characteristics), rather than looking at device name (typically 2 letters following 2 digits).
Sadly this project is not actively maintained at the moment.

The error is kinda like this one, not sure if its relative, but just suspect the bluetooth adapter or operating system could also go wrong. (Maybe some Bluetooth adapters don’t support BLE well; Windows needs much more time for Bluetooth scanning & connection, compared to GNU/Linux or Android)

[NaitLee]

You may visit this new Web app (with Chrome/Chromium/Edge etc.) and see if it will discover your printer: https://print.unseen-site.fun/

If yes, try to print with it; if not, then most likely your printer isn’t “cat printer” compatible.