HID over GATT auto reconnect

[Stéphane Lenclud]

I have a Logitech LIFT mouse pairing and connecting fine with a Pico 2 W.

However it won't reconnect without calling gap_connect and moving the mouse for some reason.

Is there no incoming connection workflow like with Classic HID?

Surely there must be a way for the mouse to initiate the connection right?

[Stéphane Lenclud]

So looking into the specs relevant sections we have:

5.1.3. Device-Initiated Connection Procedure for Bonded Devices

and for our host part:

5.2.3. Device-Initiated Connection Procedure for Bonded Devices

This is telling use that basically the host should always be scanning for incoming connections.

[Stéphane Lenclud]

I've implemented that scan as mentioned in the specs and it works well enough, the auto-reconnect works fine so far.

However my attempt at using that whitelist filtering does not seem to be working. I used gap_whitelist_add and passed 1 as last parameter to gap_set_scan_params but I'm still getting AD reports from every nearby devices for some reason.

gap_set_scan_params(0,2,18,1);

[Matthias Ringwald]

Hi Stéphane

If you only scan with whitelist to re-connect a device, you can use the gap_connect_with_whitelist() command to connect to one of the devices in the whitelist.

Other than that, please send a HCI log for this. BTstack should stop scanning, update the scan parameters, and restart scanning with whitelist. Then, the Controller should only report devices with matching addresses.

Cheers
Matthias

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[Stéphane Lenclud]

I'm not sure I understand how to use gap_connect_with_whitelist.

Do I still need to have a scan running for it to work?

[Stéphane Lenclud]

I tried it without having a scan running and no reconnect was triggered.