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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.
@jakedempsey
I think the issue is actually in the AT module. Something is broken with its timeout logic. When I increase the timeout to 10s for each AT command in the SIM900 modules init function, it works. Going to dig in more on the AT module to see if I can see why it is passing undefined back to its callback.