Unexpected Error: FileExistsError

[noduritoto]

Note: for general support questions, please use the discussions tab. This is the template for bugs in ble-serial.
Make sure you have completely read the README, searched through the issues and discussions.

Describe the bug
I met a error about 'Unexpected Error: FileExistsError'
How can I fix it?

Log messages
The full output of ble-serial -v (with your usual parameters like -d).
If it is related to BLE chracteristics please also run ble-scan -d with you device address.

Put the result into code blocks (wrap with triple backticks) to get proper formatting:
$ble-serial -d 12345678989

your log could be here

$ble-serial -d 12345678989
14:08:06.889 | ERROR | main.py: Unexpected Error: FileExistsError(17, 'File exists')
14:08:06.889 | WARNING | main.py: Shutdown initiated
14:08:06.890 | INFO | main.py: Shutdown complete.

Setup (please complete the following information):

• OS: MacOS Sonoma
• Bluetooth Hardware: [e.g. HM-10, Intel AX200 Bluetooth Adapter]
• BlueZ Version: [Output of bluetoothctl -v, Linux only]
• Python Version: [from python3 -V]
• ble-serial and dependency versions: [from pip3 list]

Additional Context
Tricks for reproducing the issue? Results from other things you have already tried? Ideas what might be the cause, etc.

[MrCocoDev]

I'm not the author, but if you use the --port parameter to change the port you can circumvent this error. I am not sure why the virtual port isn't being cleaned up automatically.

[Jakeler]

Hi, you can delete the file if you are sure no ble-serial is running, in the console simply: rm /tmp/ttyBLE

It gets auto cleaned on a usual shutdown, but maybe the process was hard killed before, then it can't run the cleanup routine.

The tip from @MrCocoDev for using a different path should work as well.

[MrCocoDev]

I think if you add:

                try:
                    self.uart = UART(args.port, loop, args.mtu)
                except OSError as e:
                    # This check might be hype specific to MacOS, not sure
                    if "FileExistsError(17, 'File exists')" in repr(e):
                        raise ValueError(
                            f"Port {args.port} already exists. "
                            f"Please specify a new port or clean "
                            f"up the old port, if it is safe to do so."
                        ) from e 

You could add a lot of clarity around this issue. I happened to figure it out from an unrelated SO and a good guess, but I imagine a lot of users will just give up in frustration.

Either way, thanks for such an awesome library!

[Jakeler]

Good idea @MrCocoDev , thanks for the contribution!
It's added now in the UART class.