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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.
@titaniumwhite
You're right, it was power up in DFU mode.
I tried re-inserting the battery with the button held down, but it's not working. The behavior is extremely strange: when I insert the battery nRF connect can see the Ruuvi, if I press to connect it tries to connect but it fails. After that, if I scan again, the app can't see the Ruuvi. The log says "Error 133 (0x85): GATT ERROR".
However, do you confirm I have to use the Nordic UART Service to communicate with the laptop? I'm a bit scared it can happen again and in that case, I'd run out of Ruuvitag.
Plus, I've read that using 128 bit UUIDs to advertise could lead to some connection problems via Bluetooth. Could it be the cause of the problem?