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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.
@Gordon
So your Logitech Bluetooth Keyboard isn't a Bluetooth LE one, just classic Bluetooth?
I'm sure I have seen BLE auto-connecting, but it might depend on the device. BLE draws so much less power than classic Bluetooth that it might be that many devices just don't bother with the reconnect, since very few BLE devices will ever voluntarily turn themselves off.
It looks like it's possible to renegotiate the connection speed on the fly with BLE - so Puck.js should be able to automatically drop to a ~1 sec interval when connected, and to then speed itself up when there is data to transfer. That's not something that has been implemented yet though.