React-Native-Reconnecting-WebSocket

React native auto reconnect websocket extends WebSocketModule. API design referenced reconnecting-websocket.

It is API compatible, so when you have:

var ws = new WebSocket('ws://....');

you can replace with:

var ws = new ReconnectingWebSocket('ws://....');

Less code, more exponential.

Parameters

var socket = new ReconnectingWebSocket(url, protocols, options);

url

• The URL you are connecting to.
• https://html.spec.whatwg.org/multipage/comms.html#network

protocols

• Optional string or array of protocols per the WebSocket spec.
• https://tools.ietf.org/html/rfc6455

options

• Options (see below)

Options

Options can either be passed as the 3rd parameter upon instantiation or set directly on the object after instantiation:

var socket = new ReconnectingWebSocket(url, null, {reconnectInterval: 3000});

reconnectInterval

• The number of milliseconds to delay before attempting to reconnect.
• Accepts integer
• Default: 1000

maxReconnectInterval

• The maximum number of milliseconds to delay a reconnection attempt.
• Accepts integer
• Default: 30000

reconnectDecay

• The rate of increase of the reconnect delay. Allows reconnect attempts to back off when problems persist.
• Accepts integer or float
• Default: 1.5

timeoutInterval

• The maximum time in milliseconds to wait for a connection to succeed before closing and retrying.
• Accepts integer
• Default: 2000

maxReconnectAttempts

• The maximum number of reconnection attempts that will be made before giving up. If null, reconnection attempts will be continue to be made forever.
• Accepts integer or null.
• Default: null

---

Methods

See the detail in react-native/WebSocket.js

How to add heartbeat?

1. usual

ws = new WebSocketJs("ws://...");

ws.onopen = (e) => {
    console.log("onopen",e)
};
ws.onmessage = (evt) => {
    console.log("onmessage",JSON.parse(evt.data))
};
ws.onclose = (e) => {
    console.log("onclose",e)
};
ws.onerror = (e) => {
    console.log("onerror",e)
};

2. add heartbeat

ws.onopen = (e) => {
    // execute immediately!
    ws.send("heartbeat string");
    
    heartCheck.reset().start()
};

ws.onmessage = (evt) => {
    heartCheck.reset().start()
};

var heartCheck = {
    timeout: 10000,//default 10s
    timeoutObj: null,
    serverTimeoutObj: null,
    reset:function(){
        clearTimeout(this.timeoutObj);
        clearTimeout(this.serverTimeoutObj);
        return this;
    },
    start:function(){
        let self = this;
        this.timeoutObj = setTimeout(function(){
            ws.send("heartbeat string");
            self.serverTimeoutObj = setTimeout(function(){
                ws.close();
            }, self.timeout)
        }, this.timeout)
    }
}