For another device like a smartphone to use any of the Bluetooth “services” which the board has, it must first be paired with the board. Once paired, the other device may connect to the board and exchange data relating to many of the board’s features.
This block starts an event handler which in this case will run when a device which is connected to your board over Bluetooth disconnects.
You could use this event handler to display a letter “D” on the board LED grid so you know that the Bluetooth connection has been closed.
bluetooth.onBluetoothDisconnected(() => {
});bluetooth.onBluetoothDisconnected(() => {
basic.showString("D");
});About Bluetooth, board Bluetooth profile overview , board Bluetooth profile reference, Bluetooth on board resources, Bluetooth SIG
bluetooth