JoyCons power-off feature

[andreabak]

Hi.

I've implemented a couple of simple power-off feature(s) for JoyCons.

1. AutoPowerOff: automatically power off joycons at program exit
2. HomeLongPowerOff: power off joycons when Home (right only joycon or combined joycons) or Capture (left only joycon) button is pressed for a long interval (hard-coded to 2s)

In order to detect long-presses of the Home/Capture buttons I've added some basic timestamp tracking for when buttons are pressed.

Tested only on JoyCons, not Pro nor SNES controller.

[Davidobot]

Oh! This is rather exciting! I'll test and merge it ASAP.

Does this allow joycons to reconnect to Windows without any problems after powering down? (ie just by pressing a button on the joycon to wake it and reconnect)

EDIT: I should put SetHCIState to good use and replace the other references to the command with that :)

[andreabak]

My joycons reconnect automatically to Windows on button press, unless they are previously re-paired/connected/charging with my Switch. This could be a welcome quirk of the Bluetooth adapter though.

It would be nice to automatically (or with the pair button) pair/re-pair them without having to go through Windows settings, because if they are paired back to the Switch they need to be first removed from Bluetooth devices then re-paired to Windows and it can be annoying, especially when the battery runs out and I want to switch them with my other joycons that are charging. But I think this is beyond the scope of this PR.

[Davidobot]

My joycons reconnect automatically to Windows on button press, unless they are previously re-paired/connected/charging with my Switch. This could be a welcome quirk of the Bluetooth adapter though.

Great, that's all I wanted to know.

Unfortunately, that sort of unable to reconnect without Windows settings behaviour is unavoidable. I mean, even the switch can't pair automatically with the controllers after they've been paired a PC. Though there are some saved-device MAC address packets in the documentation - I'll poke around.