Use a rs485 communication module

The crash is not an espruino issue, it's an usb issue, it produce too sometime with arduino...
Last week i have to update firmware and install my code on 8 Picos.... I've got crashs (with automatic reboot and message) 4 time 😗. For simple and repetitive task, reboot had made it long and stressfull.

For the upload problem, i don't know, i've discovered the reset() instruction and it seems to resolve the problem (when code use short setInterval()). You're probably right, i just change my process for upload with in first step, a reset(). Have to check