Capacitor Bluetooth Serial Plugin

Forked from capacitor-bluetooth-serial (archived)

A client implementation for interacting with Bluetooth (serial), using Capacitor.

Supported platforms

• [ ] Web
• [x] Android
• [ ] iOS

Supported Capacitor versions:

• Capacitor <= 3: Please use capacitor-bluetooth-serial (<= v0.0.3)
• Capacitor 4 (v0.4.x)

Usage

Install the plugin via npm

npm install --save @e-is/capacitor-bluetooth-serial

import {BluetoothSerial} from "@e-is/capacitor-bluetooth-serial";

//...do something with plugin

API Documentation

Interface and type definitions can be found here.

API

Methods

• BluetoothSerial.isEnabled
• BluetoothSerial.enable
• BluetoothSerial.disable
• BluetoothSerial.startEnabledNotifications
• BluetoothSerial.stopEnabledNotifications
• BluetoothSerial.scan
• BluetoothSerial.connect
• BluetoothSerial.connectInsecure
• BluetoothSerial.disconnect
• BluetoothSerial.isConnected
• BluetoothSerial.read
• BluetoothSerial.readUntil
• BluetoothSerial.startNotifications
• BluetoothSerial.stopNotifications
• BluetoothSerial.write

isEnabled

Reports if bluetooth is enabled.

isEnabled(): Promise<BluetoothState>;

Description

Function isEnabled calls the success whatever bluetooth is enabled or not. The promise will contain an attribute enabled indicating if bluetooth is enabled or not enabled. The failure callback will be called only if an error occurs.

If you want to enable bluetooth afterwards, you can use #enable directly, once #enable also check if the bluetooth is conected or not.

Parameters

None.

Quick Example

BluetoothSerial
  .isEnabled()
  .then((response: BluetoothState) => {
    const status = response.enabled ? 'enabled' : 'disabled';
    console.log(`Bluetooth is ${status}`);
  })
  .catch(() => {
    console.log('Error checking bluetooth status');
  });

enable

Enable bluetooth if it is not enabled. Also request permissions for bluetooth access if it is necessary.

enable(): Promise<BluetoothState>;

Description

Function enable calls the success whatever bluetooth is successfully enabled or not. The promise will contain an attribute enabled indicating if bluetooth is enabled or not enabled after the process. The failure callback will be called only if an error occurs.

If the app does not have permission to use bluetooth, it will request it.

Parameters

None.

Quick Example

BluetoothSerial
  .enable()
  .then((response: BluetoothState) => {
    const status = response.enabled ? 'enabled' : 'disabled';
    console.log(`Bluetooth is ${status}`);
  })
  .catch(() => {
    console.log('Error enabling bluetooth');
  });

disable

Disable bluetooth if enabled. Also request permissions for bluetooth access if it is necessary.

disable(): Promise<BluetoothState>;

Description

Function disable calls the success whatever bluetooth is successfully disabled or not. The promise will contain an attribute enabled indicating if bluetooth is enabled or not enabled after the process. The failure callback will be called only if an error occurs.

If the app does not have permission to use bluetooth, it will request it.

Parameters

None.

Quick Example

BluetoothSerial
  .disable()
  .then((response: BluetoothState) => {
    const status = response.enabled ? 'enabled' : 'disabled';
    console.log(`Bluetooth is ${status}`);
  })
  .catch(() => {
    console.log('Error disabling bluetooth');
  });

startEnabledNotifications

Be notified when bluetooth status changed.

startEnabledNotifications(): Promise<void>;

Description

Function startEnabledNotifications enable status notifications. In order to retrieve the values, use an Event Listener with 'onEnabledChanged' as event name.

const eventListener = BluetoothSerial.addListener('onEnabledChanged' , (response: BluetoothState) => {

    const { enabled } = response;
    //Do something with enabled variable
});

Parameters

None.

Quick Example

BluetoothSerial
  .startEnabledNotifications()
  .then(() => {
      eventListener = BluetoothSerial.addListener('onEnabledChanged', (data: BluetoothState) => {
        console.log('Bluetooth state changed to ' + (data.enabled ? 'Enabled' : 'Disabled'));
      });
  })
  .catch(() => {
    console.log('Error starting enabled listener');
  });

stopEnabledNotifications

Stops the propagation of value changes.

stopEnabledNotifications(): Promise<void>;

Description

Function stopEnabledNotifications disable bluetooth state notifications. Additionally, the event listener has to be removed.

eventListener.remove();

Parameters

None.

Quick Example

BluetoothSerial
  .stopEnabledNotifications()
  .then(() => {
      eventListener.remove();
  })
  .catch(() => {
    console.log('Error disabling listener for device');
  });

scan

Discover devices visible and close to the device

scan(): Promise<BluetoothScanResult>;

Description

Android

Function scan discovers Bluetooth devices close to the device and visible. The success callback is called with a list of objects similar to list, or an empty list if no devices are found.

Example list passed to success callback.

[{
    "class": 0,
    "id": "00:11:22:33:44:55",
    "address": "00:11:22:33:44:55",
    "name": "Device 1"
}, {
    "class": 7936,
    "id": "01:23:6645:4D67:89:00",
    "address": "01:23:6645:4D67:89:00",
    "name": "Device 2"
}]

The discovery process takes a while to happen. You may want to show a progress indicator while waiting for the discover proces to finish, and the sucess callback to be invoked.

Calling connect on an unpaired Bluetooth device should begin the Android pairing process.

Parameters

None.

Quick Example

BluetoothSerial
  .scan()
  .then((result: BluetoothScanResult) => {
    result.devices.forEach((device: BluetoothDevice) {
        console.log(device.id);
    });
  })
  .catch(() => {
    console.log('Error scanning devices');
  });

connect

Connect to a Bluetooth device.

connect(options: BluetoothConnectOptions): Promise<void>;

Description

Function connect connects to a Bluetooth device. The callback Success will be called when the connection is successful. Failure is called if the connection fails.

Android

For Android, connect takes a MAC address of the remote device.

Parameters

• { address }: Identifier of the remote device.

Quick Example

BluetoothSerial
  .connect({
    address: '00:11:22:33:44:55',
  })
  .then(() => {
    console.log('Successfully connected')
  })
  .catch(() => {
    console.log('Error connecting...');
  });

connectInsecure

Connect insecurely to a Bluetooth device.

connectInsecure(options: BluetoothConnectOptions): Promise<void>;

Description

Function connectInsecure connects to a Bluetooth device. The callback Success will be called when the connection is successful. Failure is called if the connection fails. Function connectInsecure works like BluetoothSerial.connect, but creates an insecure connection to a Bluetooth device. See the Android docs for more information.

Android

For Android, connectInsecure takes a MAC address of the remote device.

Parameters

• { address }: Identifier of the remote device.

Quick Example

BluetoothSerial
  .connectInsecure({
    address: '00:11:22:33:44:55',
  })
  .then(() => {
    console.log('Successfully connected')
  })
  .catch(() => {
    console.log('Error connecting...');
  });

disconnect

Disconnect a Bluetooth device.

disconnect(options: BluetoothConnectOptions): Promise<void>;

Description

Function disconnect disconnects a Bluetooth device. The callback Success will be called when the disconnection is successful. Failure is called if the disconnection fails.

Android

For Android, disconnect takes a MAC address of the remote device.

Warning: If no address is passed, all devices will be disconnected.

Parameters

• { address }: Identifier of the remote device.

Quick Example

BluetoothSerial
  .disconnect({
    address: '00:11:22:33:44:55',
  })
  .then(() => {
    console.log('Successfully disconnected')
  })
  .catch(() => {
    console.log('Error disconnecting...');
  });

isConnected

Reports the connection status.

isConnected(options: BluetoothConnectOptions): Promise<BluetoothConnectResult>;

Description

Function isConnected calls the success callback with the connection status (connected or not connected). Failure will be called only if an error occurs.

Android

For Android, isConnected takes a MAC address of the remote device.

Parameters

• { address }: Identifier of the remote device.

Quick Example

BluetoothSerial
  .isConnected({
    address: '00:11:22:33:44:55',
  })
  .then((result: BluetoothConnectResult) => {
    const status = result.connected ? 'connected' : 'disconnected';
    console.log(`Device is ${status}`);
  })
  .catch(() => {
    console.log('Error checking connection status');
  });

read

Reads data from the buffer.

read(options: BluetoothReadOptions): Promise<BluetoothReadResult>;

Description

Function read reads the data from the buffer. The data is passed to the success callback as a String. Calling read when no data is available will pass an empty String to the callback.

Parameters

• { address }: Identifier of the remote device.

Quick Example

BluetoothSerial
  .read({
    address: '00:11:22:33:44:55',
  })
  .then((result: BluetoothReadResult) => {
    console.log(result.data);
  })
  .catch(() => {
    console.log('Error reading data from device');
  });

readUntil

Reads data from the buffer until it reaches a delimiter.

readUntil(options: BluetoothReadUntilOptions): Promise<BluetoothReadResult>;

Description

Function readUntil reads the data from the buffer until it reaches a delimiter. The data is passed to the success callback as a String. If the buffer does not contain the delimiter, an empty String is passed to the callback.

Parameters

• { address }: Identifier of the remote device.
• { delimiter }: Delimiter.

Quick Example

BluetoothSerial
  .readUntil({
    address: '00:11:22:33:44:55',
    delimiter: '\n',
  })
  .then((result: BluetoothReadResult) => {
    console.log(result.data);
  })
  .catch(() => {
    console.log('Error reading data from device');
  });

startNotifications

Enable and be notified when any data is received.

startNotifications(options: BluetoothEnableNotificationsOptions): Promise<void>;

Description

Function startNotifications enable notifications. In order to retrieve the values, use an Event Listener with 'onRead' as event name.

const eventListener = BluetoothSerial.addListener('onRead' , (response: BluetoothReadResult) => {

    const { value } = response;
    //Do something with the value
});

Parameters

• { address }: Identifier of the remote device.
• { delimiter }: Delimiter for notification.

Quick Example

BluetoothSerial
  .startNotifications({
    address: '00:11:22:33:44:55',
    delimiter: '\n',
  })
  .then((result: BluetoothEnableNotificationsResult) => {
      eventListener = BluetoothSerial.addListener('onRead', (data: BluetoothReadResult) => {
      console.log("Received value: " + data.value);
    });
  })
  .catch(() => {
    console.log('Error enabling listener for device');
  });

stopNotifications

Stops the propagation of value changes.

stopNotifications(options: BluetoothDisableNotificationsOptions): Promise<void>;

Description

Function stopNotifications disable notifications. Additionally, the event listener has to be removed.

eventListener.remove();

Parameters

• { address }: Identifier of the remote device.

Quick Example

BluetoothSerial
  .stopNotifications({
    address: '00:11:22:33:44:55',
  })
  .then(() => {
    eventListener.remove();
  })
  .catch(() => {
    console.log('Error disabling listener for device');
  });

write

Write data to the buffer.

write(options: BluetoothWriteOptions): Promise<void>;

Description

Function write writes data to the buffer.

Parameters

• { address }: Identifier of the remote device.
• { value }: String to send.

Quick Example

BluetoothSerial
  .write({
    address: '00:11:22:33:44:55',
    value: 'Hello world',
  })
  .then(() => {
    console.log('Value sent to device');
  })
  .catch(() => {
    console.log('Error writing data to device');
  });