Bluetooth auto reconnect service

[RowlaxX]

Motivation

Hi, after installing ChimeraOS, I was unable to connect my Xbox Series controller until I navigated to the bluetooth settings. It was very similar to this issue

Investigation

After searching the cause of this problem, it seems that a Bluetooth scan was triggered while navigating to the Gnome Bluetooth Settings, and disabled when leaving that page.

Later, I was able to reconnect my controller by using the command bluetoothctl -t -1 scan on without navigating to the bluetooth settings

Solution

This PR add a simple systemd service that periodically scan for previously connected Bluetooth devices

I am now able to automatically reconnect my controller in the following cases :

• On startup even before the session is loaded
• When I unplug & replug my bluetooth dongle
• When my controller is disconnected due to idle or battery and I press the guide button

Mention

It seems that Bluez allow for periodic scans in the config via ScanIntervalAutoConnect & ScanWindowAutoConnect parameters (link).

This could be a way cleaner solution, but I was unable to make them work.

Hardware & Software

• Xbox Series Official Wireless Controller
• my bluetooth dongle (https://www.amazon.fr/dp/B09TT7SXHY?ref=ppx_yo2ov_dt_b_fed_asin_title)
• NVidia Geforce 1080TI
• ChimeraOS 47 (b88d2bf) [UNSTABLE]

Note

This is my first PR for Chimera so I may not have respected some design & architectural choice

[alkazar]

Thanks for the work, but I am a bit confused as to why this is necessary.

If the controller is paired, it should be able to autoconnect without this service.

[RowlaxX]

It appears that Bluez don't support autoconnect for some bluetooth controller unless there is a bluetooth scan occuring. It was the case with the bluetooth dongle mentioned above.

However, I tried to run a fresh chimeraos with another bluetooth dongle (this one) and didn't got any issue

This service is a fix for controllers that need a scan for connecting devices

[alkazar]

I see, so it is hardware dependent. Thank you.

I am not sure if it is a good idea to be scanning constantly like that. I will have to do some research and think about it.