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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.
@allObjects
@user100558, could please show the request you sent to puck for checking the LED, the request you sent for the magnetometer? ...and publish the code you loaded on puck, if you loaded any.
For the LED example, did you use this example from the Espruino site https://www.espruino.com/Web%20Bluetooth ?
I guess that the code you sent to puck as string to do something with the magnetometer has some JS syntax issue. What you send to the puck you can verify in the IDE when typing it into the console. Get the Espruino IDE going in Chrome browser on your computer, connect to puck and type it in the left hand side pane - the console, and you get what you asked for.