Sniffer breaks serial devices

RE: Sniffer breaks serial devices

Carles — Mon, 09 Dec 2019 16:25:23 GMT

Thanks for reporting this. I have created an internal Pull Request

RE: Sniffer breaks serial devices

Jacob — Mon, 09 Dec 2019 15:08:50 GMT

Yes: https://github.com/pyserial/pyserial/blob/master/serial/serialposix.py#L364

Just add exclusive=True to your Serial initialization.

RE: Sniffer breaks serial devices

Carles — Mon, 09 Dec 2019 15:06:42 GMT

I assume you mean `flock` here when you mean "open with exclusive access". Minicom for example does not see to use that at all and instead creates a /var/lock/LCK../dev/ttyACM*

RE: Sniffer breaks serial devices

Jacob — Mon, 09 Dec 2019 14:28:21 GMT

Thanks.

RE: Sniffer breaks serial devices

Carles — Mon, 09 Dec 2019 14:27:36 GMT

Yes, I can add that patch, I don't see why not. Expect it as part of the next release. Until then you can make the change locally.

RE: Sniffer breaks serial devices

Jacob — Mon, 09 Dec 2019 13:57:33 GMT

That doesn't feel like a very "general" solution. Can Nordic add exclusive access to the port when opening? I can't see why it wouldn't be opened that way?

RE: Sniffer breaks serial devices

Carles — Mon, 09 Dec 2019 13:55:09 GMT

Yes, the other alternative is to set your sniffer serial port as belonging to a particular user or user group and give that user or group access to only that serial port. Then run Wireshark as that user/group and it will only ever be able to open the serial port you have assigned for sniffing.

RE: Sniffer breaks serial devices

Jacob — Mon, 09 Dec 2019 13:12:16 GMT

Right.

Sure, but that means that the sniffer script also has to open the port in exclusive mode in order for it to work.

Thanks, Jacob

RE: Sniffer breaks serial devices

Carles — Mon, 09 Dec 2019 13:00:20 GMT

The problem here is that some users do not use J-Link at all, and your proposed patch would break nRF Sniffer for Bluetooth LE for them.

How about opening your other applications' ports in exclusive mode so that the sniffer script you paste is unable to open the serial port?

RE: Sniffer breaks serial devices

Kenneth — Mon, 09 Dec 2019 10:06:18 GMT

Okey, I have reported it for improvement for future.

Kenneth

RE: Sniffer breaks serial devices

Jacob — Mon, 09 Dec 2019 08:10:46 GMT

Hi,

When looking at the code for 3.0.0 this piece of code looks identical.

Thanks, Jacob

RE: Sniffer breaks serial devices

Kenneth — Wed, 04 Dec 2019 12:29:18 GMT

Hi,

There is a new nRF sniffer planned released on Friday, so I suggest to wait for that.

Best regards,
Kenneth