Added node example

example_node.js

@@ -0,0 +1,32 @@
+var dfu = require('./index').dfu;
+var hex2bin = require('./index').hex2bin;
+var fs = require('fs');
+
+var log = console.log;
+dfu.addLogger(log);
+
+var fileMask = "firmware/NRF51822_{0}_Rob_OTA.hex";
+var fileName = null;
+
+dfu.findDevice({ services: [0x180D] })
+.then(device => {
+    fileName = fileMask.replace("{0}", device.name === "Hi_Rob" ? "Bye" : "Hi");
+	log("found device: " + device.name);
+    log("using file name: " + fileName);
+
+	return dfu.writeMode(device);
+})
+.then(() => dfu.findDevice({ name: "DfuTarg" }))
+.then(device => {
+    var file = fs.readFileSync(fileName);
+    var hex = file.toString();
+    var buffer = hex2bin(hex);
+    log("file length: " + buffer.byteLength);
+
+    return dfu.provision(device, buffer);
+})
+.then(() => process.exit())
+.catch(error => {
+    log(error);
+    process.exit();
+});