A client implementation for interacting with Bluetooth

Supported platforms

• Web
• Android
• iOS

Install the plugin via npm

npm install --save capacitor-bluetooth-serial

In your capacitor project, make sure to register the Android plugin in in the projects MainActivity as follows

import com.bluetoothserial.plugin.BluetoothSerial;

public class MainActivity extends BridgeActivity {
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    this.init(savedInstanceState, new ArrayList<Class<? extends Plugin>>() {{
      add(BluetoothSerial.class);
    }});
  }
}

import {Plugins} from "@capacitor/core";

const { BluetoothSerial } = Plugins;

//...do something with plugin

Interface and type definitions can be found here.

• BluetoothSerial.isEnabled
• BluetoothSerial.enable
• BluetoothSerial.scan
• BluetoothSerial.connect
• BluetoothSerial.connectInsecure
• BluetoothSerial.disconnect
• BluetoothSerial.isConnected
• BluetoothSerial.read
• BluetoothSerial.readUntil
• BluetoothSerial.enableNotifications
• BluetoothSerial.disableNotifications
• BluetoothSerial.enableRawNotifications
• BluetoothSerial.disableRawNotifications
• BluetoothSerial.write

Reports if bluetooth is enabled.

isEnabled(): Promise<BluetoothEnabledResult>;

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.

None.

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

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

enable(): Promise<BluetoothEnabledResult>;

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.

None.

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

Discover devices visible and close to the device

scan(): Promise<BluetoothScanResult>;

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.

None.

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

Connect to a Bluetooth device.

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

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.

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

• { address }: Identifier of the remote device.

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

Connect insecurely to a Bluetooth device.

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

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.

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

• { address }: Identifier of the remote device.

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

Disconnect a Bluetooth device.

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

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

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

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

• { address }: Identifier of the remote device.

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

Reports the connection status.

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

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

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

• { address }: Identifier of the remote device.

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');
  });

Reads data from the buffer.

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

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.

• { address }: Identifier of the remote device.

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

Reads data from the buffer until it reaches a delimiter.

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

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.

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

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

Enable and be notified when any data is received.

enableNotifications(options: BluetoothEnableNotificationsOptions): Promise<BluetoothEnableNotificationsResult>;

Function enableNotifications enable notifications. The success callback will return an event name. In order to retrieve the values, one has to use an Event Listener with the returned event name.

const listener = BluetoothSerial.addListener( eventName , (data: BluetoothDataResult) => {

    const { value } = data.data;
    //Do something with the data
q
});

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

BluetoothSerial
  .enableNotifications({
    address: '00:11:22:33:44:55',
    delimiter: '\n',
  })
  .then((result: BluetoothEnableNotificationsResult) => {
    event = BluetoothSerial.addListener(result.eventName, (data: BluetoothDataResult) => {
        console.log(data.data);
      });
  })
  .catch(() => {
    console.log('Error enabling listener for device');
  });

Stops the propagation of value changes.

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

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

listener.remove();

• { address }: Identifier of the remote device.

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

Under development.

Under development.

Write data to the buffer.

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

Function write writes data to the buffer.

• { address }: Identifier of the remote device.
• { value }: String to send.
• { charset }: Charset of the string (Optional, default: UTF-8).

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');
  });