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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.
@parasquid
While it can handle more than one BLE connection, the webide can only be connected to the puck's serial. By default it's the BLE serial. If you move the Serial from BLE to the pins, then serial would be running there and webide doesn't have anything to connect to.
One other thing: are you sure the device you want to connect to is advertising? You can use nRF connect app on your phone and scan it and see if you can see it.
Another thing is that not all bluetooth is the same. Puck is a Bluetoothe Low Energy device, which is completely different from plain old bluetooth. What's the device you're trying to connect to?