this is a fork of https://github.com/williamwilliamwilliam/react-native-iothub-device, with some changes and potential fixes, It is not fully tested and is not usable out of the box(yet) I am working on it as i actually need this functionality in a production environment: the rest of the readme is as per the original, so not entirely accurate

react-native-iothub-device

Develop for mobile devices using Azure IoT SDKs: https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-how-to-develop-for-mobile-devices

Android is the only platform implemented right now. iOS is stubbed out, but doesn't do anything but log.

• Uses AMQP over WebSockets
• You, as connected a device, can subscribe/listen to Device Twin specific desired property changes
• You, as connected a device, can report Device Twin Reported Properties

Tested using react-native 0.58.3 starter project

• react-native init AwesomeProject --version react-native@0.58.3

Manual installation

Android Instructions

Prerequisite: configure your app as a multidex app (because Microsoft's Android SDK requires it)

android/build.gradle

  defaultConfig {
     ...
    multiDexEnabled true //Add this line
  }
  
  packagingOptions {
    exclude 'thirdpartynotice.txt'
  }
  
  dependencies {
    ...
    implementation 'com.android.support:multidex:1.0.3' //and this one
  }

Setup this library

$ npm install https://github.com/Frank-vdm/react-native-iothub-device.git --save

android/build.gradle

 dependencies {
     ...
     implementation project(':react-native-iothub-device')
 }

android/settings.gradle

include '...', 'react-native-iothub-device'
project(':react-native-iothub-device').projectDir = new File(settingsDir, '../node_modules/react-native-iothub-device/android')

Add to your MainApplication.java

import com.frank_vdm.iothub.IoTHubDevicePackage;
...
    @Override
    protected List<ReactPackage> getPackages() {
      return Arrays.<ReactPackage>asList(
          new MainReactPackage(),
              new IoTHubDevicePackage()
      );
    }

Run your app

• react-native run-android

Usage

const joinTheInterwebOfThings = async () =>{

    // Your Connection String here
    const connectionString = 'HostName=*****************.azure-devices.net;DeviceId=********;SharedAccessKey=************';

    // Any external updates to your device's twin on these desired properties will yield a onDeviceTwinPropertyRetrieved callback
    const desiredPropertySubscriptions = ['tellMe', 'somethingGood'];

    const onConnectionStatusChange = (connectionStatus) => {
        console.log(connectionStatus); // {statusChangeReason: "CONNECTION_OK", status: "CONNECTED"}
    }
    const onDeviceTwinPropertyRetrieved = (property) => {
        console.log(property); // {isReported: false, property: {key: "tellMe", value: "who's a good device?"}, version: 4}
    }
    const onMessageReceived = (message) => {
        console.log(message); // anything
    }
    const onDeviceTwinStatusCallback = (iothubResponse) => {
        console.log(iothubResponse); // {responseStatus: "OK"}
    }
    
    const onEventCallback = (iothubResponse) => {
    console.log(iothubResponse);
}

    try{
        await connectToHub(
            connectionString,
            desiredPropertySubscriptions,
            onConnectionStatusChange,
            onDeviceTwinPropertyRetrieved,
            onMessageReceived,
            onDeviceTwinStatusCallback
            onEventCallback,
            shoudRetry = true);
    }catch(error){
        console.error(error);
    }

    try{
        console.log('reporting properties...');
        await reportProperties({
            testBoolean: true,
            testNumber: new Date().getTime(),
            testString: "here's something",
            thisPropertyWontExistOnTheTwinAnymore: null
        });
    }catch(error){
        console.error(error);
    }
}
joinTheInterwebOfThings();

iOS Notes for ongoing development:

IOS SIDE IS NOT DONE, ANY Contribution will be welcome, I wont have time to look at it at present

iOS Instructions

$ gem install cocoapods
$ cd ios
$ pod init

https://github.com/Azure/azure-iot-sdk-c/blob/master/iothub_client/samples/ios/CocoaPods.md

Podfile

 pod 'AzureIoTHubClient', '1.2.4'  
 pod 'AzureIoTuAmqp', '1.2.4'

Header searcg path for Objective C usage

${PODS_ROOT}/AzureIoTHubClient/inc/
${PODS_ROOT}/AzureIoTUtility/inc/
${PODS_ROOT}/AzureIoTuMqtt/inc/
${PODS_ROOT}/AzureIoTuAmqp/inc/