Bluetooth Low-Energy Peripheral Device

This package provides an abstraction layer on top of the Bluetooth Low-Energy (BLE) peripheral device.

Get Started

npm install --save bluetooth-device

Usage

import { BluetoothDevice } from 'bluetooth-device';

const HANDLE_TEMPERATURE_READ = 1234;
const HANDLE_TEMPERATURE_WRITE = 5678;

const thermostat = new BluetoothDevice('11:22:33:44:55:66', { timeout: 1000 });
const temperature = await thermostat.read(HANDLE_TEMPERATURE_READ);

await thermostat.write(HANDLE_TEMPERATURE_WRITE, temperature + 10);

You can also extend your peripheral from the BluetoothDevice base class.

import { BluetoothDevice } from 'bluetooth-device';

const TEMPERATURE_MIN = 10;
const TEMPERATURE_MAX = 40;

const HANLDE_READ = 1234;
const HANDLE_WRITE = 5678;

export class Thermostat extends BluetoothDevice {
  async setTemperature(temperature: number): Promise<void> {
    const value = Math.min(Math.max(TEMPERATURE_MIN, temperature), TEMPERATURE_MAX);

    return await this.write(HANDLE_WRITE, value);
  }

  getTemperature(): Promise<number> {
    return this.read(HANLDE_READ);
  }
}

API

constructor

Initializes a Bluetooth device instance.

constructor(address: string, options?: object)

• address - Bluetooth address.
• options - Device options.
  • discoveryTimeout - Device discovery timeout in milliseconds. By default, it equals 30 seconds.
  • idleTimeout - Device idle timeout in milliseconds. After that, the connection will be destroyed. By default, it equals to 2 minutes.
  • retries - The number of retries on failed operations. By default, it is 3.
  • timeout - Device operations timeout, namely, connection, read, and write. By default, it equals 10 seconds.

discover

Discovers peripheral device by address.

discover(): Promise<void>

connect

Tries to establish a connection with the device. If the device was not previously discovered, the discovery operation will be performed before.

connect(): Promise<void>

disconnect

Destroys a connection with the device.

disconnect(): Promise<void>

notify

Waits for the next notification. If the device was not previously connected, the connection will be established automatically.

notify(handle: number): Promise<Buffer>

• handle - The notification handle.

read

Reads data from the device. If the device was not previously connected, the connection will be established automatically.

read(handle: number): Promise<Buffer>

• handle - The handle to read from.

write

Writes data to the device. If the device was not previously connected, the connection will be established automatically.

write(handle: number, data: Buffer): Promise<void>

• handle - The write handle.
• data - The data buffer.