Migrating app version from v2 to v3 ?Skip the create new app step. Your existing v2 app can be migrated to v3.Follow steps mentioned in Add the CometChat dependency section below to upgrade to latest version of v3

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Get your Application Keys

Signup for CometChat and then:
  1. Create a new app
  2. Head over to the API & Auth Keys section and note the Auth Key, App ID & Region

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Add the CometChat Dependency

Install the package as NPM module: 
npm install @cometchat-pro/react-native-chat@3.0.13 --save
In order to integrate the CometChat Pro React Native SDK, you need to install one more dependencies
  1. Async-Storage:
npm install @react-native-async-storage/async-storage --save
v2.4+ onwards, Voice & Video Calling functionality has been moved to a separate library. In case you plan to use the calling feature, please install the Calling dependency (@cometchat-pro/react-native-calls).npm install @cometchat-pro/react-native-calls@2.3.0 --saveThe calling component requires some configuration. Please follow the steps mentioned here.

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Calling Component Configuration

For @cometchat-pro/react-native-calls version starting 2.3.0, please make sure you add the following additional dependencies & permissions. 
{
  "@cometchat-pro/react-native-chat": "^3.0.13",
  "@react-native-async-storage/async-storage": "^1.17.5",
  "@react-native-community/netinfo": "7.1.7", // for react-native 0.63 & above.
  "@react-native-community/netinfo": "6.1.0", // for react-native below 0.63
  "react-native-background-timer": "2.4.1",
  "react-native-callstats": "3.73.7",
  "react-native-webrtc": "1.100.0"
}

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Permissions:

Android: 
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
iOS: 
<key>NSCameraUsageDescription</key>
<string>This is for Camera permission</string>
<key>NSMicrophoneUsageDescription</key>
<string>This is for Mic permission</string>

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Android:

Goto ./android folder and open project level build.gradle file and add all repository URLs in the repositories block under the allprojects section. 
allprojects {
  repositories {
    maven {
			url "https://dl.cloudsmith.io/public/cometchat/cometchat-pro-android/maven/"
		}
  }
}
Also in the same file in buildscript section in ext block make sure you have set minSdkVersion to 24. 
buildscript {
    ext {
        buildToolsVersion = "29.0.2"
        minSdkVersion = 24
        compileSdkVersion = 29
        targetSdkVersion = 29
    }
}

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iOS:

Please update the minimum target version in the Podfile. Goto ./ios folder and open the Podfile. In the Podfile update the platform version to 11.0. 
platform :ios, '11.0'
Open the ios/App folder and run pod install this will create an App.xcworkspace open this and run the app.

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Initialize CometChat

The init() method initialises the settings required for CometChat. The init() method takes the below parameters:
  1. appID - You CometChat App ID
  2. appSettings - An object of the AppSettings class can be created using the AppSettingsBuilder class. The region field is mandatory and can be set using the setRegion() method.
The AppSettings class allows you to configure two settings:
  • Region: The region where your app was created.
  • Presence Subscription: Represents the subscription type for user presence (real-time online/offline status)
  • autoEstablishSocketConnection(boolean value): This property takes a boolean value which when set to true informs the SDK to manage the web-socket connection internally. If set to false, it informs the SDK that the web-socket connection will be managed manually. The default value for this parameter is true. For more information on this, please check the Managing Web-Socket connections manually section. The default value for this property is true.
  • overrideAdminHost(adminHost: string): This method takes the admin URL as input and uses this admin URL instead of the default admin URL. This can be used in case of dedicated deployment of CometChat.
  • overrideClientHost(clientHost: string): This method takes the client URL as input and uses this client URL instead of the default client URL. This can be used in case of dedicated deployment of CometChat.
You need to call init() before calling any other method from CometChat. We suggest you call the init() method on app startup, preferably in the index.js file. 
let appID = "APP_ID";
let region = "REGION";
let appSetting = new CometChat.AppSettingsBuilder()
                        .subscribePresenceForAllUsers()
                        .setRegion(region)
                        .autoEstablishSocketConnection(true)
                        .build();
CometChat.init(appID, appSetting).then(
	() => {
		console.log("Initialization completed successfully");
	}, error => {
		console.log("Initialization failed with error:", error);
	}
);
Make sure you replace the APP_ID with your CometChat App ID and REGION with your App Region in the above code.
ParameterDescription
appIDCometChat App ID
appSettingAn object of the AppSettings class.