BLE

Platform Support

The following shows BLE module APIs available for each platform.

BLE - Bluetooth Low Energy

Event: ‘advertisingStart’

• callback {Function}
  • error {Error}

Emitted when advertisement starts.

Example

var ble = require('ble');
ble.on('advertisingStart', function(error) {
  console.log('on -> advertisingStart: ' + (error ? 'error ' + error : 'success'));
  if (!error) {
    ble.setServices([
        // service data
    ]);
  }
});

Event: ‘stateChange’

• callback {Function}
  • state {String} Can be ‘unknown’, ‘resetting’, ‘unsupported’, ‘unauthorized’, ‘poweredOff’ or ‘poweredOn’.

Emitted when adapter state is changed.

Example

var ble = require('ble');
ble.on('stateChange', function(state){
  console.log('onStateChange: ' + state);
  if (state == 'poweredOn') {
    ble.startAdvertising('iotjs', ['data'], function(err) {
    });
  } else {
    ble.stopAdvertising(function(err) {
    });
  }
});

ble.startAdvertising(name, serviceUuids[, callback])

• name {string} Maximum 26 bytes.
• serviceUuids {Array[String]}
  • 1 128-bit service UUID
  • 1 128-bit service UUID + 2 16-bit service UUIDs
  • 7 16-bit service UUID
• callback {Function} Error handler.
  • error {Error}

Starts advertising.

ble.state must be in poweredOn state before advertising is started. ble.on('stateChange', callback(state)); can be used to register for state change events.

Example

var name = 'name';
var serviceUuids = ['fffffffffffffffffffffffffffffff0']
ble.startAdvertising(name, serviceUuids[, callback(error)]);

ble.stopAdvertising(callback)

• callback {Function} Error handler.
  • error {Error}

Stops advertising.

ble.setServices(services[, callback])

• services {Array[PrimaryService]}
• callback {Function} Error handler.
  • error {Error}

Sets the primary services available on the peripheral.

Class: Descriptor

Descriptors are defined attributes that describe a characteristic value.

new Descriptor(options)

• options {Object}
  • uuid: {string} A Universally Unique ID (UUID) is a 16 or 128-bit hex value used to identify the type of every attribute.
  • value {string|Buffer}

Example

var descriptor = new Descriptor({
    uuid: '2901',
    value: 'value'
});

Class: Characteristic

Characteristics are defined attribute types that contain a single logical value.

new Characteristic(options)

• options {Object}
  • uuid: {string} A Universally Unique ID (UUID) is a 16 or 128-bit hex value used to identify the type of every attribute.
  • properties {Array[string]} Can be a combination of ‘read’, ‘write’, ‘writeWithoutResponse’, ‘notify’ and ‘indicate’.
  • secure {Array[string]} Enables security for properties, can be a combination of ‘read’, ‘write’, ‘writeWithoutResponse’, ‘notify’ and ‘indicate’.
  • value {Buffer}
  • descriptors {Array[Descriptor]}
  • onReadRequest {Function} Read request handler. (optional)
    • offset {number} (0x0000 - 0xffff)
    • callback {Function}
      • result {Characteristic.RESULT_*}
      • data {Buffer}
  • onWriteRequest {Function} Write request handler. (optional)
    • data {Buffer}
    • offset {number} (0x0000 - 0xffff)
    • withoutResponse {boolean}
    • callback {Function}
      • result {Characteristic.RESULT_*}
  • onSubscribe {Function} Notify/indicate subscribe handler. (optional)
    • maxValueSize {number} Maximum data size.
    • updateValueCallback {Function}
  • onUnsubscribe {Function} Notify/indicate unsubscribe handler. (optional)
  • onNotify {Function} Notify sent handler. (optional)
  • onIndicate {Function} Indicate confirmation received handler. (optional) Returns: {Characteristic}

Example

var characteristic = new Characteristic({
  uuid: 'fffffffffffffffffffffffffffffff1', // or 'fff1' for 16-bit
  properties: ['read', 'write'],
  secure: [],
  value: null,
  descriptors: [descriptor],
  onReadRequest: null,
  onWriteRequest: null,
  onSubscribe: null,
  onUnsubscribe: null,
  onNotify: null,
  onIndicate: null
});

Characteristic.RESULT_SUCCESS

Characteristic.RESULT_INVALID_OFFSET

Characteristic.RESULT_INVALID_ATTRIBUTE_LENGTH

Characteristic.RESULT_UNLIKELY_ERROR

Class: PrimaryService

PrimaryService is a collection of characteristics and relationships to other services that encapsulate the behavior of part of a device.

new PrimaryService(options)

• options {Object}
  • uuid {string} A Universally Unique ID (UUID) is a 16 or 128-bit hex value used to identify the type of every attribute.
  • characteristics {Array[Characteristic]}

Example

var primaryService = new PrimaryService({
  uuid: 'fffffffffffffffffffffffffffffff0', // or 'fff0' for 16-bit
  characteristics: [
    // see Characteristic for data type
  ]
});