[nrf52,ota] zephyr mcumgr ota

[tomaszduda23]

Description:

Related issue (if applicable): fixes

Pull request in esphome with YAML changes (if applicable):

• [nrf52, ota] ble and serial OTA based on mcumgr esphome#11932
• [nrf52,ota] allow to update OTA via cmd esphome#12344

Checklist:

• I am merging into next because this is new documentation that has a matching pull-request in esphome as linked above.
  or

• I am merging into current because this is a fix, change and/or adjustment in the current documentation and is not for a new component or feature.

• Link added in /components/index.rst when creating new documents for new components or cookbook.

New Component Images

If you are adding a new component to ESPHome, you can automatically generate a standardized black and white component name image for the documentation.

To generate a component image:

1. Comment on this pull request with the following command, replacing COMPONENT_NAME with your component name in UPPER_CASE format with underscores (e.g., BME280, SHT3X, DALLAS_TEMP):

   @esphomebot generate image COMPONENT_NAME
   

2. The ESPHome bot will respond with a downloadable ZIP file containing the SVG image.

3. Extract the SVG file and place it in the images/ folder of this repository.

4. Use the image in your component's index table entry in /components/index.rst.

Example: For a component called "DHT22 Temperature Sensor", use:

@esphomebot generate image DHT22

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[nschimme]

Can we improve the documentation on what we need around MCUboot? Most of what I read suggests that we only need slot0 partition but I suspect we need at least two slots for MCUBoot? My nice!nano nRF52 currently has an Adarfruit boot loader and I'm not certain what is required.

[tomaszduda23]

Best if you could open a PR with redaction of the doc. Push to this branch or just open new PR. I can link it to main PR. nrf52 doc could be improved in few places but I have no much time to think about it.

In the nut shell you need:

1. flash firmware using SWD e.g. by stlink https://esphome.io/components/nrf52/#flashing-with-mcuboot
2. From that moment you can flash new firmware using serial, cdc serial or ble

By default it use slot0 and slot1. https://docs.nordicsemi.com/bundle/ncs-latest/page/mcuboot/readme-zephyr.html