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feat(ble): Add the ability to enable and disable advertising #2546

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@ReFil ReFil commented Oct 10, 2024

Currently advertising cannot be disabled, In some circumstances it may be desirable to disable advertising to the host e.g. seeking consistency between an endpoint switch and percieved board behaviour.

This adds 3 new options to &bt, ADV_ON, ADV_OFF and ADV_TOG as well as the metadata and documentation for the behaviour. ble.c has been updated with a static flag that gets checked in update_advertising() and doesn't permit any adveritising state other than ZMK_ADV_NONE unless it's set. it's defaulted to true so standard board behavior shouldn't change.

The ability to get the current adverising state has also been added, it could have utility in custom display widgets.

Tested on a development board, I've noticed some hosts cache the advertising info so it still shows up as a connectible device if the switch is used whilst the bluetooth devices menu is open, but it still cannot be connected to. Using an app like nRF connect or a different host it can be seen that the device properly stops advertising

@ReFil ReFil requested review from a team as code owners October 10, 2024 13:31
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Regarding docs I think there might end up being some confusion when people see "This turns on advertising", use the behavior expecting to be able to connect a new device yet nothing happens because they haven't selected an unused profile.

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ReFil commented Oct 10, 2024

I see your point, it would still advertise if it's in an occupied profile but wouldn't pair and work properly. Perhaps it would be better worded as "Permits advertising (note that other conditions must be met for the device to be visible)"?

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That still sounds like it's a bit unclear to some. What would you consider to be the difference between what you've defined as BT_ADV_OFF and a hypothetical BT_OFF command?

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ReFil commented Oct 10, 2024

Functionally there's not really any difference I suppose

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I think renaming and rephrasing it appropriately would be both clearer and make it usable by non-tech people, then. Sometimes a user might want to just turn off BT after all.

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ReFil commented Oct 10, 2024

Hmm, I'm not sure about describing it as turning off Bluetooth when it doesn't do that. My concern is users may wonder if it affects split connections if it's described as shutting off Bluetooth

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True, so that's not an accurate description. Hmm.

docs/docs/keymaps/behaviors/bluetooth.md Outdated Show resolved Hide resolved
ReFil and others added 2 commits October 22, 2024 13:20
Currently advertising cannot be disabled, In some circumstances it may be desirable to disable advertising to the host e.g. seeking consistency between an endpoint switch and percieved board behaviour

Update behavior_bt.c

Revert "Update behavior_bt.c"

This reverts commit d822523.
Co-Authored-By: Nicolas Munnich <98408764+Nick-Munnich@users.noreply.github.com>
@caksoylar caksoylar added core Core functionality/behavior of ZMK bluetooth Bluetooth related items labels Oct 27, 2024
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