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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
For debugging you can connect the Puck via UART so you can communicate with it without having to have an active Bluetooth connection: http://www.espruino.com/Puck.js#serial-console
For lower level stuff you can also use this tool - but it needs an nRF51DK board: https://www.nordicsemi.com/eng/Products/Bluetooth-low-energy/nRF-Sniffer
Adafruit also have a sniffer: https://www.adafruit.com/product/2269
Is the idea that the people doing orienteering have the pucks, and the phones are static - or vice-versa?
Another option might be to make the Android app on the phone detect the advertising of Pucks it is interested in, and then to initiate a connection to the Puck itself - rather than going the other way?
I'll have a go here and will see if I can connect to a phone from a Puck though.