[NEW FEATURE] Command to demand the nodes' Bootloader Mode

[BiliouriV]

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Details

Please replace the italic test by your inputs and details in each of the following sections:

What feature would you like to be included in Luos?

It would be nice to have a message sent from Pyluos and Gate in order to demand each node's bootloader mode.

Describe the expected behavior of the feature

Pyluos before starting the uploading procedure should verify the bootloader mode of each node. We should be able to check that the mode is in APP_RELOAD_MODE in order to start the procedure.

What is the motivation / use case for changing the behavior?

In case that we have a busy network with a lot of messages like updates, it is possible that the first message when we want to reflash the boards is not received by the corresponding board (Collisions etc). For this reason we need to verify if the message is received and resend it if not.

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