What code are you using on Noble to do the transmit? And what OS are you on?
I think if Noble isn't transmitting anything it's quite likely it's some issue with your Noble code. There isn't any flow control on Bluetooth LE so Puck.js can't just reject writes. If the write isn't happening it's probably the code that is sending.
Bluetooth LE OS support can be a bit iffy - I know on Linux it's possible to get it into a state where (for instance) notifications no longer work and you have to restart the Bluetooth stack to get anywhere.
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