@d11/react-native-mqtt
v0.0.3
Published
React native support for using mqtt
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6,872
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d11-react-native-mqtt
Message Queuing Telemetry Transport (MQTT) is a lightweight, efficient, and reliable messaging protocol designed for low-bandwidth, high-latency, or unreliable networks.
MQTT operates on a publish/subscribe pattern, facilitating the decoupling of message senders (publishers) from message receivers (subscribers). This is achieved through the utilization of a central component known as a message broker, which orchestrates communication between publishers and subscribers.
This package provides MQTT functionality for React Native applications.
Internally, this package leverages HiveMQTT for Android and CocoaMQTT for iOS, ensuring seamless integration and optimal performance across both platforms.
- Contribution guidelines: CONTRIBUTING.md
- License: MIT
- MQTT resources:
Features
API flavor:
- Asynchronous API
Backpressure support:
- QoS 1 and 2
- QoS 0 (dropping incoming messages, if necessary)
- Bringing MQTT flow control and reactive pull backpressure together
Transports:
- TCP
- SSL/TLS
Automatic and configurable thread management
Automatic and configurable reconnect handling
Lifecycle listeners
- When connected
- When disconnected or connection failed
Minimum Supported Version
This project requires the following minimum versions to function properly:
- Java: JDK 8 or higher
- iOS: iOS 12.0 or higher
- Android: API level 24 (Android 7.0) or higher
Installation
using NPM
npm install @d11/react-native-mqtt
using Yarn
yarn add @d11/react-native-mqtt
General configuration
| Variable Name | Description | Default value | |:---------------:|:--------------------------------------------------------------------------------------------:|---------------| | topic | A topic is a UTF-8 encoded string that is the basis for message routing in the MQTT protocol | None | | clientId | The unique identifier of the MQTT client | None | | host | The host name or IP address of the MQTT server | None | | port | The port of the MQTT server | None | | keepAlive | Keep the connection alive for mentioned time in seconds. | 60 sec | | cleanSession | A flag to create new session or use old session while connecting | true | | backoffTime | Time to wait before retrying connection | 2 sec | | maxBackoffTime | Max time to wait before retrying connection | 60 sec | | jitter | Jitter is used to add randomness into backoff time | 1 | | enableSslConfig | A boolean indicating whether SSL/TLS configuration should be enabled | false | | autoReconnect | A boolean to determine auto reconnection | None | | retryCount | An integer to determine retry count | None |
Quality of Service (QoS)
| Enum Name | Description | |:-------------:|:---------------------------------------------------------------------:| | AT_MOST_ONCE | QoS for at most once delivery as per the capabilities of the network. | | AT_LEAST_ONCE | QoS for ensuring at least once delivery. | | EXACTLY_ONCE | QoS for ensuring exactly once delivery. |
Creation of clients
import { createMqttClient, MqttConfig } from "@d11/react-native-mqtt";
import { MqttClient } from "@d11/react-native-mqtt/dist/Mqtt/MqttClient";
export const createMqtt = (mqttConfig: MqttConfig): MqttClient => {
const client = createMqttClient({
clientId: mqttConfig.clientId,
host: mqttConfig.host,
port: mqttConfig.port,
options: {
password: '',
enableSslConfig: false,
autoReconnect: true,
maxBackoffTime: mqttConfig.maxBackoffTime,
retryCount: mqttConfig.connectRetryCount,
cleanSession: mqttConfig.cleanSession,
keepAlive: mqttConfig.keepAlive,
jitter: mqttConfig.jitter,
username: '',
},
});
return client;
}
Example
import * as React from 'react';
import { StyleSheet, View, Text, Button } from 'react-native';
import { createMqtt } from './components/create-mqtt';
import { MqttClient } from '@d11/react-native-mqtt/dist/Mqtt/MqttClient';
import { MqttConfig } from "@d11/react-native-mqtt";
const mqttConfig: MqttConfig = {
"clientId": "mqttx_0121",
"cleanSession": true,
"host": "dummy.mqttx.com",
"jitter": 1,
"keepAlive": 60,
"maxBackoffTime": 60,
"port": 8883,
"retryCount": 3
}
enum MqttQos {
AT_MOST_ONCE = 0,
AT_LEAST_ONCE = 1,
EXACTLY_ONCE = 2,
}
export default function App() {
const [client, setClient] = React.useState<MqttClient | undefined>(undefined);
const createMqttClient = () => {
const newClient = createMqtt(MqttConfig);
setClient(newClient);
};
const connectMqtt = () => {
if (client) {
client.connect();
}
};
const disconnectMqtt = () => {
if (client) {
client.disconnect();
}
};
const subscribeMQTT = () => {
if(client){
client.subscribe({
topic: "sample_topic",
qos: MqttQos.AT_LEAST_ONCE,
onSuccess: (ack) => {
console.log(`MQTT Subscription Success: ${ack}`);
},
onError: (error) => {
console.log(`MQTT Subscription Failed: ${error}}`);
},
onEvent: ({ payload }) => {
console.log(`MQTT Subscription data: ${payload}`);
}
})
}
}
return (
<View style={styles.container}>
<Button
title="Create Mqtt"
color={'green'}
onPress={createMqttClient}
/>
<Button
title="Connect Mqtt"
color={'green'}
onPress={connectMqtt}
/>
<Button
title="Subscribe MQTT"
color={'green'}
onPress={subscribeMQTT}
/>
<Button
title="Disconnect Mqtt"
color={'red'}
onPress={disconnectMqtt}
/>
</View>
);
}
const styles = StyleSheet.create({
container: {
flex: 1,
alignItems: 'center',
justifyContent: 'center',
}
});
API Support
createMqttClient
: A function that returns an instance of MqttClient with the given input config.
createMqttClient: (config: MqttConfig) => MqttClient
const client = createMqttClient(config)
type MqttConfig = {
clientId: string;
host: string;
port: number;
options?: MqttOptions;
}
type MqttOptions = {
keepAlive?: number;
cleanSession?: boolean;
username?: string;
password?: string;
maxBackoffTime?: number;
backoffTime?: number;
jitter?: number;
enableSslConfig?: boolean;
autoReconnect?: boolean;
retryCount?: number;
}
connect
: connects to MQTT server withauto-reconnect
andretry
support.
connect(options?: MqttOptions) => void
client.connect()
setOnConnectCallback
: Performs an action after connection is established.
type onConnectCallback = (ack: MqttEventsInterface[MQTT_EVENTS.CONNECTED_EVENT]) => void
client.setOnConnectCallback(onConnectCallback)
MQTT_EVENTS {
CONNECTED_EVENT = 'connected',
DISCONNECTED_EVENT = 'disconnected',
SUBSCRIPTION_EVENT = 'subscription_event',
SUBSCRIPTION_SUCCESS_EVENT = 'subscribe_success',
SUBSCRIPTION_FAILED_EVENT = 'subscribe_failed',
}
setOnConnectFailureCallback
: Sets a callback for handling connection failure events.
type onConnectFailureCallback = (mqtt5ReasonCode: Mqtt5ReasonCode) => void
client.setOnConnectFailureCallback(onConnectFailureCallback)
Mqtt5ReasonCode {
BAD_USER_NAME_OR_PASSWORD = 134,
NOT_AUTHORIZED = 135,
BAD_AUTHENTICATION_METHOD = 140,
NORMAL_DISCONNECTION = 0,
DEFAULT = -1,
}
setOnErrorCallback
: Sets a callback for handling error events.
type onErrorCallback = (ack: MqttEventsInterface[MQTT_EVENTS.ERROR_EVENT]) => void
client.setOnErrorCallback(onErrorCallback)
setOnDisconnectCallback
: Sets a callback for handling client disconnect events.
type onDisconnectCallback = (mqtt5ReasonCode: DisconnectCallback['mqtt5ReasonCode'],
options: DisconnectCallback['options']) => void
client.setOnDisconnectCallback(onDisconnectCallback)
connectInterceptor
: Method to intercept connection options and may modify or override them.
type connectInterceptor?: (options?: MqttOptions) => Promise<MqttConnect | undefined>
client.connectInterceptor()
reconnectInterceptor
: Method to intercept connection options and may modify or override them.
type reconnectInterceptor?: (mqtt5ReasonCode?: Mqtt5ReasonCode) => Promise<MqttConnect | undefined>
client.reconnectInterceptor()
setOnReconnectInterceptor
: PerformS an action everytime before reconnect after first connect fails.
type reconnectInterceptor = (
mqtt5ReasonCode?: Mqtt5ReasonCode
) => Promise<MqttConnect | undefined>
client.setOnReconnectInterceptor(reconnectInterceptor)
setOnConnectFailureCallback
: Sets a callback for handling connection failure events.
type onConnectFailureCallback = (mqtt5ReasonCode: Mqtt5ReasonCode) => void
client.setOnConnectFailureCallback(onConnectFailureCallback)
getConnectionStatus
: Gets the current connection status.
getConnectionStatus: () => string
const status = client.getConnectionStatus();
getCurrentRetryCount
: Gets the current retry count.
getConnectionStatus: () => number
const status = client.getCurrentRetryCount();
subscribe
: Subscribes to a topic with onEvent, onSuccess , onError callbacks support.
subscribe: ({ topic, qos, onEvent, onSuccess, onError}: Subscribe) => void
client.subscribe({
topic,
qos,
onEvent,
onSuccess,
onError,
})
type Subscribe = {
topic: string;
qos?: MqttQos;
onEvent: (
payload: MqttEventsInterface[MQTT_EVENTS.SUBSCRIPTION_EVENT]
) => void;
onSuccess?: (
ack: MqttEventsInterface[MQTT_EVENTS.SUBSCRIPTION_SUCCESS_EVENT]
) => void;
onError?: (
error: MqttEventsInterface[MQTT_EVENTS.SUBSCRIPTION_FAILED_EVENT]
) => void;
}
disconnect
: Disconnects with MQTT server.
disconnect: () => void
client.disconnect();
remove
: Removes particular client.
remove: () => void
client.remove();
How does it work?
Running example app
# install all packages
yarn
# for android
yarn example android
# for ios
yarn example ios
Contributing
See the contributing guide to learn how to contribute to the repository and the development workflow.
License
MIT