Don't pair directly in the device's Bluetooth settings. If you have already, unpair it.
Use the "Connect" button in the App loader, or "Connect new device" in Gadgetbridge (and it might even be beneficial to choose the option not to pair there).
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.
Don't pair directly in the device's Bluetooth settings. If you have already, unpair it.
Use the "Connect" button in the App loader, or "Connect new device" in Gadgetbridge (and it might even be beneficial to choose the option not to pair there).
That's something to start with...