Merge pull request #885 from iankchristie/GATTStart

Gatt start

Author: iankchristie

nodejs/FatBeaconPeripheral/FatBeacon.js

@@ -1,18 +1,21 @@
 var bleno = require('bleno');
 var eddystoneBeacon = require('eddystone-beacon');
+var webpageCharacteristic = require('./webpageCharacteristic');
+
+var SERVICE_UUID = 'ae5946d4-e587-4ba8-b6a5-a97cca6affd3';
 
 /***********************Altering Library Functions**************************/
 /**
  * In order to broadcast in the fatbeacon format, we override several
  * functions in the advertisement-data module of the eddystone-beacon library.
  */
-var AdvertisementData = 
+var AdvertisementData =
         require('eddystone-beacon/lib/util/advertisement-data');
 var Eir = require('eddystone-beacon/lib/util/eir');
 
 var FAT_BEACON_FRAME_TYPE = 0x0e;
 var MAX_URL_LENGTH = 18;
-var SERVICE_UUID = 'feaa';
+var ADVERTISING_HEADER_UUID = 'feaa';
 
 /**
  * this patch ensures that the correct Fatbeacon eir flag (0x06) is added
@@ -21,8 +24,8 @@ var SERVICE_UUID = 'feaa';
 AdvertisementData.makeEirData = function(serviceData) {
   var eir = new Eir();
   eir.addFlags(0x06);
-  eir.add16BitCompleteServiceList([SERVICE_UUID]);
-  eir.addServiceData(SERVICE_UUID, serviceData);
+  eir.add16BitCompleteServiceList([ADVERTISING_HEADER_UUID]);
+  eir.addServiceData(ADVERTISING_HEADER_UUID, serviceData);
   return eir.buffer();
 }
 
@@ -33,7 +36,7 @@ AdvertisementData.makeEirData = function(serviceData) {
  */
 AdvertisementData.makeUrlBuffer = function(name) {
   console.log(`AdvertisementData.makeUrlBuffer called with: ${name}`);
-  
+
   var encodedName = Buffer.from(name);
   if (encodedName.length > MAX_URL_LENGTH) {
     throw new Error(`Encoded Name must be less than ${MAX_URL_LENGTH} bytes.` +
@@ -50,5 +53,28 @@ AdvertisementData.makeUrlBuffer = function(name) {
 
 /*********************************************************/
 
+var characteristic = new webpageCharacteristic();
+var data = new Buffer.from('Hello World of FatBeacon!');
+characteristic.onWriteRequest(data, 0, null, null);
+
+var service = new bleno.PrimaryService({
+  uuid: SERVICE_UUID,
+  characteristics: [
+    characteristic
+  ]
+});
+
+bleno.once('advertisingStart', function(err) {
+  
+  if(err) {
+    throw err;
+  }
+
+  console.log('on - advertisingStart');
+  bleno.setServices([
+    service
+  ]);
+});
+
 // Start Advertising name.
 eddystoneBeacon.advertiseUrl('New Fatbeacon');

nodejs/FatBeaconPeripheral/webpageCharacteristic.js

@@ -0,0 +1,49 @@
+var util = require('util');
+var bleno = require('bleno');
+var CHARACTERISTIC_UUID = 'd1a517f0-2499-46ca-9ccc-809bc1c966fa';
+
+var WebpageCharacteristic = function() {
+  WebpageCharacteristic.super_.call(this, {
+    uuid: CHARACTERISTIC_UUID,
+    properties: ['read'],
+    value: null
+  });
+
+  this._value = Buffer.alloc(0);
+  this._updateValueCallback = null;
+};
+
+util.inherits(WebpageCharacteristic, bleno.Characteristic);
+
+WebpageCharacteristic.prototype.onReadRequest = function(offset, callback) {
+  console.log(`Reading - ${this._value}`);
+  callback(this.RESULT_SUCCESS, this._value);
+};
+
+WebpageCharacteristic.prototype.onWriteRequest = function(data, offset, withoutResponse, callback) {
+  this._value = data;
+
+  console.log(`Writing - ${this._value}`);
+
+  if (this._updateValueCallback) {
+    console.log('WebpageCharacteristic - onWriteRequest: notifying');
+
+    this._updateValueCallback(this._value);
+  }
+
+  if(callback) {
+    callback(this.RESULT_SUCCESS);
+  }
+};
+
+WebpageCharacteristic.prototype.onSubscribe = function(maxValueSize, updateValueCallback) {
+  console.log('WebpageCharacteristic - onSubscribe');
+  this._updateValueCallback = updateValueCallback;
+};
+
+WebpageCharacteristic.prototype.onUnsubscribe = function() {
+  console.log('WebpageCharacteristic - onUnsubscribe');
+  this._updateValueCallback = null;
+};
+
+module.exports = WebpageCharacteristic;