BLE Peripheral

peripheraj.js

var bleno = require('bleno');

bleno.on('stateChange', function(state) {
    console.log('State change: ' + state);
    if (state === 'poweredOn') {
	console.log('advertising')
	bleno.startAdvertising('MyPeripheral',['12ab']);
    } else {
	bleno.stopAdvertising();
    }
});

bleno.on('accept', function(clientAddress) {
    console.log("Accepted connection from address: " + clientAddress);
});

bleno.on('disconnect', function(clientAddress) {
    console.log("Disconnected from address: " + clientAddress);
});

bleno.on('advertisingStart', function(error) {
    if (error) {
	console.log("Advertising start error:" + error);
    } else {
	console.log("Advertising start success");
	bleno.setServices([
	    new bleno.PrimaryService({
		uuid : '12ab',
		characteristics : [
		    new bleno.Characteristic({
			value : null,
			uuid : '34cd',
			properties : ['notify', 'read', 'write'],

			// If the client subscribes, we send out a message every 1 second
			onSubscribe : function(maxValueSize, updateValueCallback) {
			    console.log("Device subscribed");
			    this.intervalId = setInterval(function() {
				console.log("Sending: Hi!");
				updateValueCallback(new Buffer("Hi!"));
			    }, 1000);
			},

			// If the client unsubscribes, we stop broadcasting the message
			onUnsubscribe : function() {
			    console.log("Device unsubscribed");
			    clearInterval(this.intervalId);
			},

			// Send a message back to the client with the characteristic's value
			onReadRequest : function(offset, callback) {
			    console.log("Read request received");
			    callback(this.RESULT_SUCCESS, new Buffer("Echo: " +
								     (this.value ? this.value.toString("utf-8") : "")));
			},

			// Accept a new value for the characterstic's value
			onWriteRequest : function(data, offset, withoutResponse, callback) {
			    this.value = data;
			    console.log('Write request: value = ' + this.value.toString("utf-8"));
			    callback(this.RESULT_SUCCESS);
			}
		    })
		]
	    })
	]);
    }
});