TI SensorTag (CC2541) SimpleKey(button) Service sample Program on node.js

ti_sensortag_simplekey.js

/* $ npm install sensortag (require `libbluetooth-dev`) */
var SensorTag = require('sensortag');
var net = require('net');

var myUUID = process.env["TI_UUID"] || "YOUR_TI_sensor_tag_UUID";

console.log("start");
console.log("waiting for connect from " + myUUID);
SensorTag.discover(function(sensorTag) {
	console.log(">> STOP: Ctrl+C or SensorTag power off");
	sensorTag.connect(function() {
		console.log("found: discovery service ... (very slow)");
		sensorTag.discoverServicesAndCharacteristics(function() {
			sensorTag.readDeviceName(function(deviceName) {
				console.log("connect: " + deviceName);
				sensorTag.notifySimpleKey(function() {
					console.log("ready: notifySimpleKey");
					console.log("// left right (x = pushed, o = opened) //");
					sensorTag.on("simpleKeyChange", function(left, right) { /* run per pushed button */
						var btn_st = 0x00; /* ボタンが押された時のみ送信するようにするためのフィルタ変数 */
						var send_str = "";
						if (left)  {
							btn_st += 0x10;
							send_str += "    x";
						} else {
							send_str += "    o";
						}
						if (right) {
							btn_st += 0x01;
							send_str += "     x";
						} else {
							send_str += "     o";
						}
						if (0x00 != (btn_st & 0x11)) {
							console.log(send_str);
						}
					});
				});
			});
		});
	});
	/* In case of SensorTag PowerOff or out of range when fired `onDisconnect` */
	sensorTag.on("disconnect", function() {
		console.log("disconnect");
		process.exit(0);
	});
}, myUUID);

$ sudo apt-get install libbluetooth-dev
$ npm install sensortag
$ sudo node ./ti_sensortag_simplekey.js 
>> STOP: Ctrl+C or SensorTag power off
found: discovery service ...
connect: TI BLE Sensor Tag
start: notifySimpleKey
// left right (x = pushed, o = opened) //
    o     x
    x     o
    x     o

TI_UUID=UUID node ti_sensortag_simplekey.js