samples: sat-cont & sat-dual-stack: Add board support for nrf54l15tag and XIAO ESP32-C6

[Kr0nu5]

Overlay for nrf54l15tag selects antenna 1 by default but can be switched to antenna 2 or both in the overlay, while the config sets the tx power to the max (+7dbm). The XIAO board has an smd antenna it uses by default, so a kconfig.projbuild boolean EXTERNAL_ANTENNA and accompanying code snippet were added to select the external antenna (u.fL) using the on-board RF switch.

[ceolin]

Thanks a lot for the contribution, it is looking good. Just a few requests:

• Split the PR into two commits, one per board. It makes easier to bisect when debugging.
• Please provide a proper commit message, the body is empty, it is missing the signed-off needed by DCO. See https://github.com/HubbleNetwork/hubble-device-sdk?tab=contributing-ov-file#commit-guide
• The copyright in the file is saying Hubble, add your own.

[ceolin]

I don't think this is necessarily a sample an option, since it is a board property. It would be better to have it in the board Kconfig and apply it to any application using it (during the board initialization code).

Not a blocker, we can do it after ... but I think that is the right direction.

[Kr0nu5]

Agreed - just found the board specific dir (port/esp-idf/hubblenetwork-sdk/boards/esp32-c6), would have put the options and code there if I saw if before. I will be sure to give the board option and antenna select function better naming to make clear it is for the XIAO ESP32-C6 as well.

[ceolin]

This does not need to be duplicated in each sample if goes to the board implementation.

[Kr0nu5]

Same as above - found the esp32-c6 board config dir and will move the definition there.

[Kr0nu5]

Thanks a lot for the contribution, it is looking good. Just a few requests:

* Split the PR into two commits, one per board. It makes easier to bisect when debugging.

* Please provide a proper commit message, the body is empty, it is missing the signed-off needed by DCO. See https://github.com/HubbleNetwork/hubble-device-sdk?tab=contributing-ov-file#commit-guide

* The copyright in the file is saying Hubble, add your own.

Thanks for the heads up - I will split the commits (with above changes) and be sure to add a proper commit message, sign-off, and copyright info.

[ceolin]

Sorry for the late reply, we have been busy with the latest release :)

Thanks for following up on it. I think the NRF54 part could be done in a snippet, but I can do it later if you prefer. The Espressif part I don't think fits in the sample.

Can you have only the nrf54 part in the commit and merge that ?

[ceolin]

These overlays will need to be duplicated in all builds for this target, a better approach would be define either define a snippet for this or do it programmatically in the board initialization.

[ceolin]

I don't think this code fits in the sample, the implementation it is supporting an external antenna only in a a hardcoded gpio ...