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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@kisse66
Thanks for all the info.
Bad wifi connection should not be the issue here, since I've used the same module for months with C-code (but the reasoning makes sense, cheap oscillators are often.. cheap).
Late yesterday I decided to try another FW file just in case. I took the "cutting edge" one (travis/master, 1v93 4m.tgz). There was no combined file, so I used latest esptool.py and the instructions in the README. Up till now I've not had any issues with the same module at the same location with the same code! Does not yet proove anything, but I've been able to do tens of modifications and resets without any more issues. Maybe it breaks as I hit post...
By the way, originally I used nodemcu-pyflasher and the combined image for the job.
I'll play with this a few days more to see if it really works now.