You can have a custom Bluetooth service set up but this way just connects to the Puck's BLE UART and allows you to send JavaScript code to be executed.
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.
Check this out: http://www.espruino.com/Puck.js+Node-REDÂ#controlling-the-puck
You can have a custom Bluetooth service set up but this way just connects to the Puck's BLE UART and allows you to send JavaScript code to be executed.