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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.
@ChristianW
I just bought me a playbulb, too (because I was curious) and will have a look at it tonight.
What I'd try:
On iOS there is the LightBlue app that can create/clone and simulate any BLE device from service/characteristic perspective.
When I pretend to be a PlayBulb on device A (iOS running lightBlue) I can track what the PlayBulb app on Device B actually sends to do certain things.
(Kind of "man in the middle" debugging)