sys/nimble_autoadv: add new module #13425

HendrikVE · 2020-02-20T15:51:07Z

Contribution description

This PR is outsourcing the module nimble_autoadv from my other PR #12012. Its main purpose is to restart the bluetooth advertising mechanism after a device disconnects, waiting for the next device connecting.

Testing procedure

You can test this module with #13506.

HendrikVE · 2020-06-08T14:34:50Z

Could you please have a look, @haukepetersen ? :)

haukepetersen · 2020-06-10T13:15:03Z

Yes, will do.

haukepetersen

Just some small remarks, else looks good to me

pkg/nimble/autoadv/nimble_autoadv.c

HendrikVE · 2020-06-10T17:34:10Z

Thank you, I pushed a fixup commit

haukepetersen

one thing I forgot to mention yesterday...

pkg/nimble/autoadv/include/nimble_autoadv.h

pkg/nimble/autoadv/nimble_autoadv.c

haukepetersen · 2020-06-11T13:35:48Z

pkg/nimble/autoadv/nimble_autoadv.c

+    }
+}
+
+int nimble_autoadv_add_field(uint8_t type, const void *data, size_t data_len)


just noticed: there is currently no way to reset the advertising data at runtime, right? I wonder if there is an easy and efficient way to add that functionality. I see two options: add a separate function like nimble_autoadv_ad_reset() or add something like a reset flag to this function here. I feel pretty much indifferent about this, so I let you decide whether you want to do this at all or which way would be best :-)

I like the idea. It gives us a reset function without a code overhead, because I can simply move the initialization code in to the reset function. I squashed the previous fixups and pushed a new commit with my proposal for a reset function.

So what I did is a complete reset. I believe you meant a reset only for the data stored in _ad. I don't really have a use case for a reset myself on hand, but I think if I would like to use it, than I would like to reset everything and make necessary changes afterwards.

HendrikVE · 2020-06-22T12:31:16Z

@haukepetersen So what do you think?

HendrikVE · 2020-07-07T15:06:35Z

Ping @haukepetersen

HendrikVE · 2020-08-21T20:57:16Z

@haukepetersen ? :)

fjmolinas · 2020-10-09T08:42:15Z

ping @haukepetersen :) !

stale review

pkg/nimble/autoadv/include/nimble_autoadv.h

pkg/nimble/autoadv/nimble_autoadv.c

fjmolinas · 2020-11-03T15:20:59Z

@HendrikVE I tested the example examples/nimble_gattand both on master and on this PR when I disconnect from the device I'm still able to connect to it afterwards, is that expected? I though this new module would enable me to do this but that It would not on master.

HendrikVE · 2020-11-04T13:04:12Z

I tested the example examples/nimble_gattand both on master and on this PR when I disconnect from the device I'm still able to connect to it afterwards, is that expected?

Yes, it is! :) You picked exactly the application where we can reduce the code size by using this module. Have look at #13506 / 68d5778

fjmolinas · 2020-11-04T13:33:25Z

I tested the example examples/nimble_gattand both on master and on this PR when I disconnect from the device I'm still able to connect to it afterwards, is that expected?

Yes, it is! :) You picked exactly the application where we can reduce the code size by using this module. Have look at #13506 / 68d5778

Then can you suggest a testing procedure to see the changes? Is there an application where the device would no start advertsiing again?

HendrikVE · 2020-11-04T14:02:56Z

Then can you suggest a testing procedure to see the changes?

I'm using Nordics mobile app nRF Connect. I rebased #13506 again to this PR, so nimble_gatt can be used for testing with the latest changes. But you'll need an nrf52 for testing.

Is there an application where the device would no start advertsiing again?

nimble_gatt and nimble_heart_rate_sensor both restart advertising. nimble_scanner does not use advertising at all. I'm not aware of an example not restarting advertising after a disconnect.

fjmolinas · 2020-11-04T14:23:33Z

Then can you suggest a testing procedure to see the changes?

I'm using Nordics mobile app nRF Connect. I rebased #13506 again to this PR, so nimble_gatt can be used for testing with the latest changes. But you'll need an nrf52 for testing.

Yes I did that to verify that things where working as before.

Is there an application where the device would no start advertsiing again?

nimble_gatt and nimble_heart_rate_sensor both restart advertising. nimble_scanner does not use advertising at all. I'm not aware of an example not restarting advertising after a disconnect.

So I'm asking because in your PR description you state "Its main purpose is to restart the bluetooth advertising mechanism after a device disconnects, waiting for the next device connecting.".

Do you know what was allowing this in master version of examples/nimble_gatt? I'm sorry if I'm being dump and not understanding what I should be looking for in the test behavior. But for example with respect to examples/nimble_gatt in #13506, are you just changing the logic that is causing the device to resume advertising after a disconnect?

HendrikVE · 2020-11-04T15:12:34Z

Do you know what was allowing this in master version of examples/nimble_gatt?

The restart of advertising is done by the gap_event_cb callback. It's given as parameter to ble_gap_adv_start and eventually ends up being used within the nimble stack. If something changes, the callback receives e.g. BLE_GAP_EVENT_DISCONNECT and starts advertising again.

In 1513526 by using the new nimble_autoadv module I'm able to remove gap_event_cb and start_advertise.

gap_event_cb@nimble_gatt is mapped to _gap_event_cb@nimble_autoadv (exactly the same)
start_advertise@nimble_gatt is mapped to nimble_autoadv_start@nimble_autoadv
- nimble_autoadv_start is by default called automatically by nimble_autoadv_init via auto_init.c by nimble_riot_init

are you just changing the logic that is causing the device to resume advertising after a disconnect?

I would describe it like the following. nimble_autoadv is outsourcing the logic to a separate module so the logic for restarting the advertising is reusable for other applications. They don't need to define the same simple callback all over again. But by making it a module we also add some features so it's not stuck to a set of settings.

fjmolinas · 2020-11-05T08:07:03Z

I've tested that the examples are still operational with these changes. From what I see in the review all comments by @haukepetersen have been addressed and they where minor remarks, everything else was OK on his side #13425 (review). I'm trusting his close review of the code, I've tested and taken a general look. Please squash @HendrikVE!

module for automated bluetooth advertising

HendrikVE · 2020-11-05T11:02:10Z

Squashed and checks passed, thanks!

fjmolinas

ACK.

HendrikVE requested review from aabadie, fjmolinas and jia200x as code owners February 20, 2020 15:51

HendrikVE requested a review from haukepetersen February 20, 2020 15:51

HendrikVE added Area: BLE Area: Bluetooth Low Energy support Area: sys Area: System Type: new feature The issue requests / The PR implemements a new feature for RIOT labels Feb 20, 2020

HendrikVE force-pushed the pr/nimble_auto_adv branch from 9dda892 to 7376cd6 Compare February 20, 2020 15:54

HendrikVE changed the title ~~sys/nimble_auto_adv add new module~~ sys/nimble_auto_adv: add new module Feb 20, 2020

HendrikVE mentioned this pull request Feb 20, 2020

sys/stdio_nimble: add new stdio module using nimble #12012

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HendrikVE force-pushed the pr/nimble_auto_adv branch from 19a9755 to cf07988 Compare February 24, 2020 15:20

HendrikVE changed the title ~~sys/nimble_auto_adv: add new module~~ sys/nimble_autoadv: add new module Feb 24, 2020

HendrikVE force-pushed the pr/nimble_auto_adv branch 3 times, most recently from 4e7c9c4 to 499576e Compare February 25, 2020 00:16

HendrikVE mentioned this pull request Feb 28, 2020

examples/nimble_*: use nimble_autoadv module #13506

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HendrikVE force-pushed the pr/nimble_auto_adv branch from dc50520 to 24a29c1 Compare November 5, 2020 09:23

sys/nimble_autoadv: add new module

fe4f0a6

module for automated bluetooth advertising

HendrikVE force-pushed the pr/nimble_auto_adv branch from 24a29c1 to fe4f0a6 Compare November 5, 2020 09:54

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fjmolinas merged commit 5a9223e into RIOT-OS:master Nov 5, 2020

HendrikVE deleted the pr/nimble_auto_adv branch December 28, 2021 22:35

sys/nimble_autoadv: add new module #13425

sys/nimble_autoadv: add new module #13425

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Contribution description

Testing procedure

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