Hey there. I was wondering if it is possible to write and read without explicit using an serviceUUID and characteristicUUID? Something like write(peripheralId) ...

I have been unable to get the module working in a demo android app.

Can you confirm

1. The current module stands compatible with the latest versions of react and react-native (
   e.g. on close inspection in the latest version of react-native to call NativeModules one has to use
   import { NativeModules } from 'react-native'; ) ??

The following is a simple code written in index.android.js but BleManager always returns undefined..

`
import React, { Component } from 'react';
import { BleManager } from 'react-native-ble-manager';
import {
AppRegistry,
StyleSheet,
Text,
View
} from 'react-native';

class bluetooth extends Component {

componentWillMount () {
//BleManager returns undefined//
console.log(BleManager.checkState())
}

render() {
return (


Welcome to React Native!


);
}
}

const styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: 'center',
alignItems: 'center',
backgroundColor: '#F5FCFF',
},
welcome: {
fontSize: 20,
textAlign: 'center',
margin: 10,
}
});

AppRegistry.registerComponent('bluetooth', () => bluetooth);
`

I have followed all the steps of adding code in
1 . app/build.gradle
2. android/settings.gradle
3. MainApplication

But The BleManager always returns undefined...

PR #35 forgot to make changes to writeWithoutResponse

AwersomeProjeect, one question,
NativeAppEventEmitter should be DeviceEventEmitter according to the docs of react-native;

After discovering/connecting a peripheral, there is no characteristic in returned object.

Hi, thanks for the plugin. I don't see a writeWithoutResponse method, is there one?

I encounter a issue, when my ble device has no service, the connect success callback is never called after I call:

BLEManager.connect(peripheralId)
.then(() => {
  // the code here is never called
})

After research the code, I find that after connected the peripheral, connect callback is not called, but discoverServices method and discoverCharacteristics:forService: is called immediately.
I think this is not a best practice and it is better to split discoverServices from connect.

In android, the app can promote user to enable bluetooth if it is off.
Could you add a enable method in android for that?

Hi,

The example in the readme doesn't show how to import/require the ble-manager.

I tried

var BleManager = require('react-native-ble-manager');

and

import { BleManager } from 'react-native-ble-manager';

but both result in an undefined BleManager.

Hey there. I am tryinig to read and write to a bluetooth module. I have problems to understand how this works obviously, but maybe someone could help me with this... Discovering and connecting to the Bluetooth MOdule works great and wasn´t that hard, but now i would like to read data from the module. Where do i find the characteristicUUID which is needed to read from module?

This is what i receive from the module out of discovery:

It seems this is (and all the other similar projects I've come across) are simply bluetooth managers IE. you can disconnect and connect to devices from within in app which seems rather odd since the OS can typically handle that on its own. Perhaps I'm not understanding the documentation correctly but how can I do something like this..

bluetoothHeartMonitor.listenForInput(input) {
 this.setState{
    pulse: input;
  }
}

render() {
  <text>{this.state.pulse}</text>
}

Where input is the value that came from the bluetooth device. Any help is much appreciated, thanks.

Hello,
Everytime the app is started it asks to turn on bluetooth is there a way to disable this or to ask only when the component mount?

Thanks

Hey there, i am trying to use enableBluetooth() on Android on a real device and it always crashes.

My stacktrace:

Any hints on this how to fix it?

Hi there,
I use react-native-ble-manager with android. Does this module can be used for connection to the anaren atmosphere device?

use as follow when use in android
protected List getPackages() {
return Arrays.asList(
new MainReactPackage(),
new BleManagerPackage(this)
);
}

I have performed the initial set up steps within Xcode.

I also added the line import { BleManager } from 'react-native-ble-manager';
but when I try to console.log(BleManager), it says undefined.

Any idea?

Hi, I am wondering is there anyway to make this library scans ble data on the Background even after the app is killed. I can see, it works only on the foreground for now. Thanks in advance!

https://github.com/innoveit/react-native-ble-manager/blob/master/ios/BleManager.m#L387

Should be if ([dataMessage length] > maxByteSize) {.

Hello, I need to write a byte 01 in characteristic, but can not,
You could put me an example.
Thank you!!

It's possible that device connected to the iOS app with bonding?
Thanks

Hi! Is there any way to disconnect to a device when the app shuts down? Since we don't want any leaking open connections. How do you other guys deal with it? I have tried to put the the disconnection request in the componentWillUnmount function but it doesn't work.
Thanks.

write(peripheralId, serviceUUID, characteristicUUID, data, maxByteSize)

when call method:
BleManager.connect(data.id) .then((peripheralInfo) => { console.log('connected'); console.log('peripheralInfo:', peripheralInfo); })
result peripheralInfo like:
{ "services": [{"uuid": "1800"}], "characteristics": [{"service": "1800", "characteristic": "2a00", "properties": {"Read": "Read"}}] }
what's the meaning of the result peripheralInfo?
how to use it?
hope to have some examples with more detail.

react-native-ble-manager version: 2.0.0, same in 1.4.0

like #60 , when I connect a peripheral by id that getting from getConnectedPeripherals, I got error

Could not find peripheral XXXX

I check the code and find that it checks if the id is in the discovered peripherals before connecting to it, but in my scenario, the scan operation is skipped if I find the peripheral in the connected peripherals.

As apple recommend at https://developer.apple.com/library/content/documentation/NetworkingInternetWeb/Conceptual/CoreBluetooth_concepts/BestPracticesForInteractingWithARemotePeripheralDevice/BestPracticesForInteractingWithARemotePeripheralDevice.html#//apple_ref/doc/uid/TP40013257-CH6-SW9

when reconnecting a peripheral, it is better to get connected peripherals to check if the peripheral is connected before scan.

I recently updated to version 2.0.0 and when scanning for devices on iOS, I get no devices back.
However, on the same version, on Android, it works correctly.

In the mean time, I've rolled back to version 1.4.0.

I hope this can get fixed!

Thanks very much

when I call getConnectedPeripherals with serviceUUIDs = [], the result is empty, but if I call it with serviceUUIDs = ['one service uuid in connected peripherals], the result is right.
is the serviceUUIDs required to getConnectedPeripherals?

For scanning ble peripherals on Android 6.x the apps need ACCESS_COARSE_LOCATION permission. RN 0.33 added a library for requesting Android M Permissions, for now is better use an external library like react-native-android-permissions .

I get this error for Android writeWithoutResponse.

The callback writeWithoutResponse() exists in module BleManager, but only one callback may be registered to a function in a native module.

The problem seems to be that successCallback is invoked twice within writeWithoutResponse. Once in here and again here

I am unable to get startNotification / stopNotification working. My peripheral is a RPI3 running Node JS Bleno. The characteristic works with the subscribe, read, and write operations using the nRF Connect application on Android. I can get the read and write operations to work calling them individually. All operations fail after the application calls startNotification. Does anyone have a good example of startNotification working?

Hi there,
I've investigated a source code of cordova plugin. I see that I can just send a array of bytes
https://github.com/don/cordova-plugin-ble-central/blob/15a8c204779357c2e3c3bb6370987ea6ff38b92a/src/android/Peripheral.java#L509

So what is purpose for converting string to base64 for?

Hey,

I noticed that every time I stop a notification on iOS that my peripheral disconnects. Commenting out this line here seems to solve the issue:

https://github.com/innoveit/react-native-ble-manager/blob/master/ios/BleManager.m#L87

Is this intended behavior?

Love this library, but is there no way to check the connection status of a peripheral? Without that capability it is difficult to manage the connection state between the app and the pairing of devices in iOS system settings. Thanks in advance.

when I disconnect a peripheral by id which is from getConnectedPeripherals, I got error:

Could not find peripheral XXXX

Could you post some more examples on how to connect to a device?

I tried using the examples from the README.md to connect my iphone to my mac using the UUID and MAC address, but none of them worked.

Thanks!

Currently, all scanning filters out duplicates.

https://developer.apple.com/library/ios/documentation/CoreBluetooth/Reference/CBCentralManager_Class/index.html#//apple_ref/doc/constant_group/Peripheral_Scanning_Options

I want to scan some my bluetooth module and connect to it. after i connected to it, i want to write data to specific characteristic UUID. but i've kept getting error

The callback write() exists in module BleManager, but only one callback may be registered to a function in a native module.

my whole code is below

import React, { Component } from 'react';
import {
AppRegistry,
StyleSheet,
Text,
View,
TextInput,
Image,
ActivityIndicator,
TouchableHighlight,
NativeAppEventEmitter
} from 'react-native';

var Button = require('../common/button');
var BleManager=require('react-native-ble-manager');
var base64 = require('base64-js');

var b_list;
var dev;
var sub;

module.exports = React.createClass({
getInitialState: function(){
return {
username: '',
password: '',
animating: true,
service: 'ddsjdsljslks',
};
},

render: function(){
return (
<View style={ styles.container2 }>
<View style={ styles.p1 }>
Sign Out
<TouchableHighlight onPress = { this.btnPress }>
Bluetooth test

{this.state.service}

      <TouchableHighlight
        style={styles.button}
        underlayColor={'gray'}
        onPress={this.onSkipPress}
        >
        <Text style={styles.t3}>Skip</Text>
      </TouchableHighlight>

    </View>

    <View style={styles.p2}>
      <Image
        style={styles.img1}
        source={{uri: 'https://d30y9cdsu7xlg0.cloudfront.net/png/37728-200.png'}
      }/>

      <View style={styles.p2_row}>
        <ActivityIndicator animating={this.state.animating} color="black" style={ {paddingRight:15} }/>
        <Text>Your device has Blueooth {"\n"} turned off. Please swipe up {"\n"} and turn it on.</Text>
      </View>
    </View>

    <View style={styles.p3}>
      <Text>Need help with pairing?</Text>
    </View>

  </View>
);

},

componentDidMount: function() {
this.handleDiscoverPeripheral = this.handleDiscoverPeripheral.bind(this);

sub= NativeAppEventEmitter.addListener('BleManagerDiscoverPeripheral', this.handleDiscoverPeripheral); 

},

onSkipPress: function(){
//this.props.navigator.push({name: 'v2_calm'});

var data = base64.fromByteArray('HeckYes');
BleManager.write(dev.id, "00002220-0000-1000-8000-00805F9B34FB", "00002221-0000-1000-8000-00805F9B34FB", data)

},

onPress: function(){
// Log the user in
this.setState({
password: ''
});

},

btnPress: function(){
BleManager.scan([], 5);

},

handleDiscoverPeripheral: function(device){
dev=device;
console.log(typeof device);
console.log(Object.getOwnPropertyNames(device));
console.log(device);
if(typeof device===undefined)
{ this.setState({service: 'unde'}) }
else
{
this.setState({service: device.name});
BleManager.connect(device.id)
.then(() => {
// Success code
console.log('Connected');
})
.catch((error) => {
// Failure code
console.log(error);
});
//this.props.navigator.push({name: 'v2_calm'});
sub.remove();
}
}

});

Scanning with a service UUID doesn't seem to filter anything, I still discover every peripheral around.
But it's working on iOS.

Tested on HTC M7, Samsung GT-i9505 (both running 5.0.1) and iPhone 6 Plus running iOS 9

Hi,

Thanks for this excellent job. I was trying to scan for devices with this module but I can not make it work. I am developing an Android app using a Samsung Galaxy S3 phone with Android 4.3. I am also using the last version of React Native (0.29). I did all the configurations described in the README file, but when I try to run the application appears the error: "cannot read property 'scan' of undefined". Could you please help me with this problem?

Hi everyone!
How can I get the list of all available bluetooth devices?

is there iOS version?

Hey there, i need to read the value of an characteristic (in this case a private service !?)
One problem is, when i read() nothing happens. I tried to trace the native code on ios as well as on android. This is how my read looks like.

First example is when i read "public services":

let peripheralId = "some peripheral UUID or MAC address";
let serviceUUID = "180A";
let characteristicUUID = "2A25";
BleManager.read(peripheralId, serviceUUID, characteristicUUID).then((readData) => {
            console.log('value', readData);
            that.hex2a(readData); -> Response is Bluetooth Manufacturer in this case: Mircochip
        }).catch((error) => {
            console.log('err', error);
        });

Second example is when i read from "private services":

let peripheralId = "some peripheral UUID or MAC address";
let serviceUUID = "00035B03-58E6-07DD-021A-08123A000300";
let characteristicUUID = "00035B03-58E6-07DD-021A-08123A000301";
BleManager.read(peripheralId, serviceUUID, characteristicUUID).then((readData) => {
            console.log('value', readData);
            that.hex2a(readData);
        }).catch((error) => {
            console.log('err', error);
        });

Nothing happens when i try the second example...I am not sure what the problem is...maybe the UUID´s are too long :P

RN 0.37
iOS 10.1.1
XCode 8.1

scan is failing to discover peripheral on iOS for all 2.x releases. It works fine on 1.4.0.
Did anything change related to linking the project? I have BleManager.xcodeproj in Libraries and linked libBleManager.a, CoreBluetooth.framework in Build Phases.

Hello,
while writing more then 20 bytes the plugin splits data correctly but it doesn't send the correct offset to the reader.
Any solution?

Thanks

I want to scan some my bluetooth module and connect to it. after i connected to it, i want to write data to specific characteristic UUID. but i've kept getting error

The callback write() exists in module BleManager, but only one callback may be registered to a function in a native module.

my whole code is below

import React, { Component } from 'react';
import {
AppRegistry,
StyleSheet,
Text,
View,
TextInput,
Image,
ActivityIndicator,
TouchableHighlight,
NativeAppEventEmitter
} from 'react-native';

var Button = require('../common/button');
var BleManager=require('react-native-ble-manager');
var base64 = require('base64-js');

var b_list;
var dev;
var sub;

module.exports = React.createClass({
getInitialState: function(){
return {
username: '',
password: '',
animating: true,
service: 'ddsjdsljslks',
};
},

render: function(){
return (
<View style={ styles.container2 }>
<View style={ styles.p1 }>
Sign Out
<TouchableHighlight onPress = { this.btnPress }>
Bluetooth test

{this.state.service}

      <TouchableHighlight
        style={styles.button}
        underlayColor={'gray'}
        onPress={this.onSkipPress}
        >
        <Text style={styles.t3}>Skip</Text>
      </TouchableHighlight>

    </View>

    <View style={styles.p2}>
      <Image
        style={styles.img1}
        source={{uri: 'https://d30y9cdsu7xlg0.cloudfront.net/png/37728-200.png'}
      }/>

      <View style={styles.p2_row}>
        <ActivityIndicator animating={this.state.animating} color="black" style={ {paddingRight:15} }/>
        <Text>Your device has Blueooth {"\n"} turned off. Please swipe up {"\n"} and turn it on.</Text>
      </View>
    </View>

    <View style={styles.p3}>
      <Text>Need help with pairing?</Text>
    </View>

  </View>
);

},

componentDidMount: function() {
this.handleDiscoverPeripheral = this.handleDiscoverPeripheral.bind(this);

sub= NativeAppEventEmitter.addListener('BleManagerDiscoverPeripheral', this.handleDiscoverPeripheral); 

},

onSkipPress: function(){
//this.props.navigator.push({name: 'v2_calm'});

var data = base64.fromByteArray('HeckYes');
BleManager.write(dev.id, "00002220-0000-1000-8000-00805F9B34FB", "00002221-0000-1000-8000-00805F9B34FB", data)

},

onPress: function(){
// Log the user in
this.setState({
password: ''
});

},

btnPress: function(){
BleManager.scan([], 5);

},

handleDiscoverPeripheral: function(device){
dev=device;
console.log(typeof device);
console.log(Object.getOwnPropertyNames(device));
console.log(device);
if(typeof device===undefined)
{ this.setState({service: 'unde'}) }
else
{
this.setState({service: device.name});
BleManager.connect(device.id)
.then(() => {
// Success code
console.log('Connected');
})
.catch((error) => {
// Failure code
console.log(error);
});
//this.props.navigator.push({name: 'v2_calm'});
sub.remove();
}
}

});

* What went wrong:
Execution failed for task ':app:processDebugManifest'.
> Manifest merger failed : uses-sdk:minSdkVersion 16 cannot be smaller than version 18 declared in library [NativeCloudMsgs:react-native-ble-manager:unspecified] /.../android/app/build/intermediates/exploded-aar/NativeCloudMsgs/react-native-ble-manager/unspecified/AndroidManifest.xml
    Suggestion: use tools:overrideLibrary="it.innove" to force usage

Any idea why?

Hi, thanks for this module, awesome job!!
one question,
Is there in the library a FIFO queue?

Hey! I am trying to decode the raw data of the advertising package (advertising.data). First I decoded the string to a byte array with bas64-js package and then I tried the following node packages:

https://github.com/tessel/bleadvertise - Didn't work. "Can't find variable: Buffer"
https://www.npmjs.com/package/ble-ad-parser - - Didn't work. "Can't find variable: Buffer"
https://github.com/mfgCode/ble-packet-parser - Didn't work. Reports are undefined.

Does anyone know how to read the data? :)

Example how the whole package looks like. I am trying to decode the advertising.data part.

{
rssi: -93,
name: 'Liee_A3',
id: '4E:3C:B1:F7:A0:F9',
advertising: 
{ CDVType: 'ArrayBuffer',
data: 'AgEGE/9MAAwOAEGAkOLfaaB9WE7cR0AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=' } 
}

Why device name is always null? I tried with iOS

Bluetooth.scan([], 5, false)
.then(() => {
// Success code
console.log('Scan started');
});

NativeAppEventEmitter.addListener(
'BleManagerDiscoverPeripheral',
(args) => {
console.log(args)
}
);

args is object like this:
{ id: 'C92C740D-A084-FAB7-7A44-251D12F7D099',
advertising: { kCBAdvDataIsConnectable: true } }
2016-08-05 18:43:12.399 [info][tid:com.facebook.react.JavaScript] { id: 'C92C740D-A084-FAB7-7A44-251D12F7D099',
advertising:
{ kCBAdvDataServiceData:
{ '8EB5':
{ CDVType: 'ArrayBuffer',
data: 'AZAGmKhr6ZF2x0/EiSpVGs8Hx3wADgK7+ANY' } },
kCBAdvDataIsConnectable: true } }