react-native-ble-stream

This project (at least currently) depends strongly on


It's planned to add streaming functionality for L2Cap (iOS) and RfComm (Android). Starting with Android Q L2Cap will be available as well, so once this is possible, we plan to integrate that as well.

This product is not finished yet and currently doesn't solve all the problems mentioned above.

DO NOT USE THIS FOR THE MOMENT, YOU WILL BE DISAPPOINTED OTHERWISE

Requirements

RN 0.40+

Supported Platforms

- iOS 8+
- Android (API 19+)

Install

``shell
npm i --save react-native-ble-stream
`

After installing, you need to link the native library. You can either:
* Link native library with react-native link, or
*
* Link native library manually

Both approaches are described below.

$3

`shell
react-native link react-native-ble-manager
`

After this step:
* iOS should be linked properly.
* Android will need one more step, you need to edit android/app/build.gradle:
`gradle
// file: android/app/build.gradle
...

android {
...

defaultConfig {
...
minSdkVersion 19 // <--- make sure this is 19 or greater
...
}
...
}
`

$3

#### iOS
- Open the node_modules/react-native-ble-manager/ios folder and drag BleManager.xcodeproj into your Libraries group.
- Check the "Build Phases"of your project and add "libBleManager.a" in the "Link Binary With Libraries" section.

#### Android
##### Update Gradle Settings

`gradle
// file: android/settings.gradle
...

include ':react-native-ble-manager'
project(':react-native-ble-manager').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-ble-manager/android')
`
##### Update Gradle Build

`gradle
// file: android/app/build.gradle
...

android {
...

defaultConfig {
...
minSdkVersion 19 // <--- make sure this is 19 or greater
...
}
...
}

dependencies {
...
compile project(':react-native-ble-manager')
}
`
##### Update Android Manifest

`xml
// file: android/app/src/main/AndroidManifest.xml
...



...
`

##### Register React Package
`java
...
import it.innove.BleManagerPackage; // <--- import

public class MainApplication extends Application implements ReactApplication {

...

@Override
protected List getPackages() {
return Arrays.asList(
new MainReactPackage(),
new BleManagerPackage() // <------ add the package
);
}

...
}
`

Note

- Remember to use the start method before anything.
- If you have problem with old devices try avoid to connect/read/write to a peripheral during scan.
- Android API >= 23 require the ACCESS_COARSE_LOCATION permission to scan for peripherals. React Native >= 0.33 natively support PermissionsAndroid like in the example.
- Before write, read or start notification you need to call retrieveServices method

Example

The easiest way to test is simple make your AppRegistry point to our example component, like this:
`javascript
// in your index.ios.js or index.android.js
import React, { Component } from 'react';
import {
AppRegistry,
} from 'react-native';
import App from 'react-native-ble-manager/example/App' //<-- simply point to the example js!

AppRegistry.registerComponent('MyAwesomeApp', () => App);
`

Or, you can still look into the whole example folder for a standalone project.

Methods

$3

Init the module.
Returns a Promise object.
Don't call this multiple times.

__Arguments__
- options - JSON

The parameter is optional the configuration keys are:
- showAlert - Boolean - [iOS only] Show or hide the alert if the bluetooth is turned off during initialization
- restoreIdentifierKey - String - [iOS only] Unique key to use for CoreBluetooth state restoration
- forceLegacy - Boolean - [Android only] Force to use the LegacyScanManager

__Examples__
`js
BleManager.start({showAlert: false})
.then(() => {
// Success code
console.log('Module initialized');
});

`

$3

Scan for availables peripherals.
Returns a Promise object.

__Arguments__
- serviceUUIDs - Array of String - the UUIDs of the services to looking for. On Android the filter works only for 5.0 or newer.
- seconds - Integer - the amount of seconds to scan.
- allowDuplicates - Boolean - [iOS only] allow duplicates in device scanning
- scanningOptions - JSON - [Android only] after Android 5.0, user can control specific ble scan behaviors:
- numberOfMatches - Number - corresponding to setNumOfMatches)
- matchMode - Number - corresponding to setMatchMode)
- scanMode - Number - corresponding to setScanMode)


__Examples__
`js
BleManager.scan([], 5, true)
.then(() => {
// Success code
console.log('Scan started');
});

`

$3

Stop the scanning.
Returns a Promise object.

__Examples__
`js
BleManager.stopScan()
.then(() => {
// Success code
console.log('Scan stopped');
});

`

$3

Attempts to connect to a peripheral. In many case if you can't connect you have to scan for the peripheral before.
Returns a Promise object.

> In iOS, attempts to connect to a peripheral do not time out (please see Apple's doc), so you might need to set a timer explicitly if you don't want this behavior.

__Arguments__
- peripheralId - String - the id/mac address of the peripheral to connect.

__Examples__
`js
BleManager.connect('XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX')
.then(() => {
// Success code
console.log('Connected');
})
.catch((error) => {
// Failure code
console.log(error);
});
`

$3

Disconnect from a peripheral.
Returns a Promise object.

__Arguments__
- peripheralId - String - the id/mac address of the peripheral to disconnect.
- force - boolean - [Android only] defaults to true, if true force closes gatt
connection and send the BleManagerDisconnectPeripheral
event immediately to Javascript, else disconnects the
connection and waits for disconnected state to
close the gatt connection)
and then sends the BleManagerDisconnectPeripheral to the
Javascript

__Examples__
`js
BleManager.disconnect('XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX')
.then(() => {
// Success code
console.log('Disconnected');
})
.catch((error) => {
// Failure code
console.log(error);
});
`

$3

Create the request to the user to activate the bluetooth.
Returns a Promise object.

__Examples__
`js
BleManager.enableBluetooth()
.then(() => {
// Success code
console.log('The bluetooth is already enabled or the user confirm');
})
.catch((error) => {
// Failure code
console.log('The user refuse to enable bluetooth');
});
`

$3

Force the module to check the state of BLE and trigger a BleManagerDidUpdateState event.

__Examples__
`js
BleManager.checkState();
`

$3

Start the notification on the specified characteristic, you need to call retrieveServices method before.
Returns a Promise object.

__Arguments__
- peripheralId - String - the id/mac address of the peripheral.
- serviceUUID - String - the UUID of the service.
- characteristicUUID - String - the UUID of the characteristic.

__Examples__
`js
BleManager.startNotification('XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX', 'XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX', 'XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX')
.then(() => {
// Success code
console.log('Notification started');
})
.catch((error) => {
// Failure code
console.log(error);
});
`

$3

Stop the notification on the specified characteristic.
Returns a Promise object.

__Arguments__
- peripheralId - String - the id/mac address of the peripheral.
- serviceUUID - String - the UUID of the service.
- characteristicUUID - String - the UUID of the characteristic.

$3

Read the current value of the specified characteristic, you need to call retrieveServices method before.
Returns a Promise object.

__Arguments__
- peripheralId - String - the id/mac address of the peripheral.
- serviceUUID - String - the UUID of the service.
- characteristicUUID - String - the UUID of the characteristic.

__Examples__
`js
BleManager.read('XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX', 'XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX', 'XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX')
.then((readData) => {
// Success code
console.log('Read: ' + readData);

const buffer = Buffer.Buffer.from(readData); //https://github.com/feross/buffer#convert-arraybuffer-to-buffer
const sensorData = buffer.readUInt8(1, true);
})
.catch((error) => {
// Failure code
console.log(error);
});
`

$3

Write with response to the specified characteristic, you need to call retrieveServices method before.
Returns a Promise object.

__Arguments__
- peripheralId - String - the id/mac address of the peripheral.
- serviceUUID - String - the UUID of the service.
- characteristicUUID - String - the UUID of the characteristic.
- data - Byte array - the data to write.
- maxByteSize - Integer - specify the max byte size before splitting message

__Data preparation__

If your data is not in byte array format you should convert it first. For strings you can use convert-string or other npm package in order to achieve that.
Install the package first:
`shell
npm install convert-string
`
Then use it in your application:
`js
// Import/require in the beginning of the file
import { stringToBytes } from 'convert-string';
// Convert data to byte array before write/writeWithoutResponse
const data = stringToBytes(yourStringData);
`
Feel free to use other packages or google how to convert into byte array if your data has other format.

__Examples__
`js
BleManager.write('XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX', 'XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX', 'XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX', data)
.then(() => {
// Success code
console.log('Write: ' + data);
})
.catch((error) => {
// Failure code
console.log(error);
});
`

$3

Write without response to the specified characteristic, you need to call retrieveServices method before.
Returns a Promise object.

__Arguments__
- peripheralId - String - the id/mac address of the peripheral.
- serviceUUID - String - the UUID of the service.
- characteristicUUID - String - the UUID of the characteristic.
- data - Byte array - the data to write.
- maxByteSize - Integer - (Optional) specify the max byte size
- queueSleepTime - Integer - (Optional) specify the wait time before each write if the data is greater than maxByteSize

__Data preparation__

If your data is not in byte array format check info for the write function above.

__Example__
`js
BleManager.writeWithoutResponse('XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX', 'XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX', 'XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX', data)
.then(() => {
// Success code
console.log('Writed: ' + data);
})
.catch((error) => {
// Failure code
console.log(error);
});
`

$3

Read the current value of the RSSI.
Returns a Promise object.

__Arguments__
- peripheralId - String - the id/mac address of the peripheral.

__Examples__
`js
BleManager.readRSSI('XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX')
.then((rssi) => {
// Success code
console.log('Current RSSI: ' + rssi);
})
.catch((error) => {
// Failure code
console.log(error);
});
`

$3

Request a connection parameter update.
Returns a Promise object.

__Arguments__
- peripheralId - String - the id/mac address of the peripheral.
- connectionPriority - Integer - the connection priority to be requested, as follows:
- 0 - balanced priority connection
- 1 - high priority connection
- 2 - low power priority connection

__Examples__
`js
BleManager.requestConnectionPriority('XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX', 1)
.then((status) => {
// Success code
console.log('Requested connection priority');
})
.catch((error) => {
// Failure code
console.log(error);
});
`

$3

Request an MTU size used for a given connection.
Returns a Promise object.

__Arguments__
- peripheralId - String - the id/mac address of the peripheral.
- mtu - Integer - the MTU size to be requested in bytes.

__Examples__
`js
BleManager.requestMTU('XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX', 512)
.then((mtu) => {
// Success code
console.log('MTU size changed to ' + mtu + ' bytes');
})
.catch((error) => {
// Failure code
console.log(error);
});
`

$3

Retrieve the peripheral's services and characteristics.
Returns a Promise object.

__Arguments__
- peripheralId - String - the id/mac address of the peripheral.
- serviceUUIDs - String[] - [iOS only] only retrieve these services.

__Examples__
`js
BleManager.retrieveServices('XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX')
.then((peripheralInfo) => {
// Success code
console.log('Peripheral info:', peripheralInfo);
});
`

$3

refreshes the peripheral's services and characteristics cache
Returns a Promise object.

__Arguments__
- peripheralId - String - the id/mac address of the peripheral.

__Examples__
`js
BleManager.refreshCache('XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX')
.then((peripheralInfo) => {
// Success code
console.log('cache refreshed!')
})
.catch((error) => {
console.error(error)
});
`

$3

Return the connected peripherals.
Returns a Promise object.

__Arguments__
- serviceUUIDs - Array of String - the UUIDs of the services to looking for.

__Examples__
`js
BleManager.getConnectedPeripherals([])
.then((peripheralsArray) => {
// Success code
console.log('Connected peripherals: ' + peripheralsArray.length);
});

`

$3

Start the bonding (pairing) process with the remote device.
Returns a Promise object. The promise is resolved when either new bond successfully created or bond already existed, otherwise it will be rejected.

__Examples__
`js
BleManager.createBond(peripheralId)
.then(() => {
console.log('createBond success or there is already an existing one');
})
.catch(() => {
console.log('fail to bond');
})

`

$3

Remove a paired device.
Returns a Promise object.

__Examples__
`js
BleManager.removeBond(peripheralId)
.then(() => {
console.log('removeBond success');
})
.catch(() => {
console.log('fail to remove the bond');
})

`

$3

Return the bonded peripherals.
Returns a Promise object.

__Examples__
`js
BleManager.getBondedPeripherals([])
.then((bondedPeripheralsArray) => {
// Each peripheral in returned array will have id and name properties
console.log('Bonded peripherals: ' + bondedPeripheralsArray.length);
});

`

$3

Return the discovered peripherals after a scan.
Returns a Promise object.

__Examples__
`js
BleManager.getDiscoveredPeripherals([])
.then((peripheralsArray) => {
// Success code
console.log('Discovered peripherals: ' + peripheralsArray.length);
});

`

$3

Removes a disconnected peripheral from the cached list.
It is useful if the device is turned off, because it will be re-discovered upon turning on again.
Returns a Promise object.

__Arguments__
- peripheralId - String - the id/mac address of the peripheral.

$3

Check whether a specific peripheral is connected and return true or false.
Returns a Promise object.

__Examples__
`js
BleManager.isPeripheralConnected('XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX', [])
.then((isConnected) => {
if (isConnected) {
console.log('Peripheral is connected!');
} else {
console.log('Peripheral is NOT connected!');
}
});

`

Events

$3

The scanning for peripherals is ended.

__Arguments__
- none

__Examples__
`js
bleManagerEmitter.addListener(
'BleManagerStopScan',
() => {
// Scanning is stopped
}
);
`

$3

The BLE change state.

__Arguments__
- state - String - the new BLE state ('on'/'off').

__Examples__
`js
bleManagerEmitter.addListener(
'BleManagerDidUpdateState',
(args) => {
// The new state: args.state
}
);
`

$3

The scanning find a new peripheral.

__Arguments__
- id - String - the id of the peripheral
- name - String - the name of the peripheral
- rssi - Number - the RSSI value
- advertising - JSON - the advertising payload, according to platforms:
- [Android] contains the raw bytes and data (Base64 encoded string)
- [iOS] contains a JSON object with different keys according to Apple's doc, here are some examples:
- kCBAdvDataChannel - Number
- kCBAdvDataIsConnectable - Number
- kCBAdvDataLocalName - String
- kCBAdvDataManufacturerData - JSON - contains the raw bytes and data (Base64 encoded string)

__Examples__
`js
bleManagerEmitter.addListener(
'BleManagerDiscoverPeripheral',
(args) => {
// The id: args.id
// The name: args.name
}
);
`

$3

A characteristic notify a new value.

__Arguments__
- value — Array — the read value
- peripheral — String — the id of the peripheral
- characteristic — String — the UUID of the characteristic
- service — String — the UUID of the characteristic

> Event will only be emitted after successful startNotification.

__Example__
`js
import { bytesToString } from 'convert-string';

async function connectAndPrepare(peripheral, service, characteristic) {
// Connect to device
await BleManager.connect(peripheral);
// Before startNotification you need to call retrieveServices
await BleManager.retrieveServices(peripheral);
// To enable BleManagerDidUpdateValueForCharacteristic listener
await BleManager.startNotification(peripheral, service, characteristic);
// Add event listener
bleManagerEmitter.addListener(
'BleManagerDidUpdateValueForCharacteristic',
({ value, peripheral, characteristic, service }) => {
// Convert bytes array to string
const data = bytesToString(value);
console.log(Recieved ${data} for characteristic ${characteristic});
}
);
// Actions triggereng BleManagerDidUpdateValueForCharacteristic event
}
`

$3

A peripheral was connected.

__Arguments__
- peripheral - String - the id of the peripheral
- status - Number - [Android only] connect reasons)

$3

A peripheral was disconnected.

__Arguments__
- peripheral - String - the id of the peripheral
- status - Number - [Android only] disconnect reasons`)