Battery Service 0x180F example

examples/battery-service/.gitignore

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+node_modules

examples/battery-service/README.md

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+# BLE Battery Service
+
+This example provides a BLE battery service (0x180F) for your Mac.
+
+Install dependencies
+
+    npm install
+
+Run the example
+
+    node main.js

examples/battery-service/battery-level-characteristic.js

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+var util = require('util'),
+  os = require('os'),
+  exec = require('child_process').exec,
+  bleno = require('bleno'),
+  Descriptor = bleno.Descriptor,
+  Characteristic = bleno.Characteristic;
+
+var BatteryLevelCharacteristic = function() {
+  BatteryLevelCharacteristic.super_.call(this, {
+      uuid: '2A19',
+      properties: ['read'],
+      descriptors: [
+        new Descriptor({
+            uuid: '2901',
+            value: 'Battery level between 0 and 100 percent'
+        }),
+        new Descriptor({
+            uuid: '2904',
+            value: new Buffer([0x04, 0x01, 0x27, 0xAD, 0x01, 0x00, 0x00 ]) // maybe 12 0xC unsigned 8 bit
+        })
+      ]
+  });
+};
+
+util.inherits(BatteryLevelCharacteristic, Characteristic);
+
+BatteryLevelCharacteristic.prototype.onReadRequest = function(offset, callback) {
+
+  if (os.platform() === 'darwin') {
+    exec('pmset -g batt', function (error, stdout, stderr) {
+
+      var data = stdout.toString();
+      // data - 'Now drawing from \'Battery Power\'\n -InternalBattery-0\t95%; discharging; 4:11 remaining\n'
+      var percent = data.split('\t')[1].split(';')[0];
+      console.log(percent);
+      percent = parseInt(percent, 10);
+      callback(this.RESULT_SUCCESS, new Buffer([percent]));
+
+    });
+  } else {
+    // return hardcoded value
+    callback(this.RESULT_SUCCESS, new Buffer([98]));
+  }
+};
+
+module.exports = BatteryLevelCharacteristic;

examples/battery-service/battery-service.js

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+var util = require('util'),
+  bleno = require('bleno'),
+  BlenoPrimaryService = bleno.PrimaryService,
+  BatteryLevelCharacteristic = require('./battery-level-characteristic');
+
+function BatteryService() {
+  BatteryService.super_.call(this, {
+      uuid: '180F',
+      characteristics: [
+          new BatteryLevelCharacteristic()
+      ]
+  });
+}
+
+util.inherits(BatteryService, BlenoPrimaryService);
+
+module.exports = BatteryService;

examples/battery-service/main.js

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+var bleno = require('bleno'),
+  BatteryService = require('./battery-service');
+
+var primaryService = new BatteryService();
+
+bleno.on('stateChange', function(state) {
+    console.log('on -> stateChange: ' + state);
+
+    if (state === 'poweredOn') {
+        bleno.startAdvertising('Battery', [primaryService.uuid]);
+    } else {
+        bleno.stopAdvertising();
+    }
+});
+
+bleno.on('advertisingStart', function(error) {
+    console.log('on -> advertisingStart: ' + (error ? 'error ' + error : 'success'));
+
+    if (!error) {
+        bleno.setServices([primaryService]);
+    }
+});

examples/battery-service/package.json

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+{
+  "name": "battery-service",
+  "version": "0.1.0",
+  "description": "BLE (Bluetooth Low Energy) Battery Service",
+  "main": "index.js",
+  "engines": {
+    "node": ">=0.10"
+  },
+  "os": [
+    "darwin",
+    "linux"
+  ],
+  "author": {
+    "name": "Don Coleman",
+    "url" : "https://github.com/don"
+  },
+  "dependencies": {
+    "bleno": ">0.1.4"
+  }
+}