Feature request: (optionally) boot into firmware after flashing

[abliss]

Currently, at least with my Spike Prime hub, after running pybricks dev flash, the device stays in DFU mode, and the only way I've found to restart it is to hold the power button for several seconds. It would be nice if it could reboot automatically to speed up dev cycles.

I have found that currently my pybricsdev is calling out to dfu-util with a command like ['dfu-util', '--device', ',0694:0008', '--alt', '0', '--reset', '--download', '/tmp/tmpskjwf028/firmware.dfu']. I have also found that if I replace "--download" with "--dfuse-address", f"{FIRMWARE_ADDRESS}:leave" , it seems to work great and reboots right away into the micropython firmware. However, I'm not sure if this will work for everybody or not.

[abliss]

(Separately, it would be super awesome if there was some way to reboot the device from the micropython runtime into the bootloader, so I don't have to pull out the cable and hold the bluetooth button while plugging it back in! I have no idea whether this is already implemented, nor whether there is any possible way to do it, but please let me know if anyone has any clues!)

[dlech]

Unfortunately, this (the separate request) isn't technically possible using the stock bootloader on hubs with USB. We would have to install a secondary bootloader, like mboot from MicroPython in order to make that actually possible.

[dlech]

When pyusb is present and working, pybricksdev uses a pure Python implementation for DFU which works as expected instead of calling dfu-util. So feel free to make a pull request to fix the dfu-util fallback.

[laurensvalk]

Separately, it would be super awesome if there was some way to reboot the device from the micropython runtime into the bootloader, so I don't have to pull out the cable and hold the bluetooth button while plugging it back in

You can leave the cable plugged in. Just hold Bluetooth when you start the hub again. As far as the hub knows, that's where life begins, so it's really only just been plugged in 😄