Porting Espruino to RedBear BLE Nano 2

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Gordon

Well, BLE will always be available, but UART is only used if it's connected since it draws a lot of power.

Where can I find the rules how to describe the particular card? ...BOARD.PY

You mean what's in those files? https://github.com/espruino/Espruino/blob/master/README_BuildProcess.md might help - but otherwise you just have to dig around I'm afraid.

FW for PUCKJS is in zip archive... what is in the file "espruino_1v91_puckjs.dat"?

It's all to do with the 'secure bootloader' - the zip file contains only the binary, but not the SoftDevice.

The hex file contains everything (at least for nRF52DK) and is just a complete image of flash memory

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