Switch on GL-MT300N-V2 does not turn on WireGuard

voodoo · 2022-08-31T19:15:30.880Z

I have the MT300N-V2 “mango” router. I have it configured to use the switch on the back to enable/disable WireGuard. It is not working correctly. It will stop WireGuard, but it will not start it back up. I have to start it from the web interface.

I did some poking around, and I think I have narrowed down where the bug is located. In the /usr/bin/switchaction script, on line 82, it tries to run this command to determine if the switch is left or right:

switch_left=$(grep -o "BTN_0.*hi" /sys/kernel/debug/gpio)

That always comes back as an empty string.

I am on firmware 3.212.

Any help would be greatly appreciated.

voodoo · 2022-08-31T19:35:05.673Z

I do not see a change in /sys/kernel/debug/gpio before and after moving the switch. I get this either direction:

root@GL-MT300N-V2:~# cat /sys/kernel/debug/gpio
gpiochip0: GPIOs 0-31, parent: platform/10000600.gpio, 10000600.gpio:
 gpio-0   (                    |BTN_0               ) in  lo
 gpio-3   (                    |BTN_1               ) in  lo
 gpio-11  (                    |usb                 ) out hi

gpiochip1: GPIOs 32-63, parent: platform/10000600.gpio, 10000600.gpio:
 gpio-38  (                    |reset               ) in  hi
 gpio-42  (                    |gl-mt300n-v2:green:p) out lo
 gpio-43  (                    |gl-mt300n-v2:green:w) out hi
 gpio-44  (                    |gl-mt300n-v2:red:wla) out hi

I know the switchaction script is being executed when I flip the switch because I threw some debugging in there, so the switch itself seems functional.

alzhao · 2022-09-07T03:07:16.714Z

The switch left is correct.

image998×517 18.2 KB

So it must be something else.

alzhao · 2022-09-07T03:33:17.532Z

Tested on firmware 3.212

Install Azirevpn
Connect Azirevpn (must do this once to have a default Wireguard config)
Set up the switch to control Wireguard
Use switch to control wireguard: Left - enable, Right - disable

Works as expected.