WebSocket is a single TCP Connect to full duplex Communication protocol. WebSocket communication protocol was approved by IETF As standard RFC 6455 and supplemented by RFC7936. WebSocket API Also be W3C Set as standard.

WebSocket makes the data exchange between the client and the server easier, allowing the server to actively push data to the client. In the WebSocket API, the browser and server only need to complete one handshake, and they can directly create a persistent connection and carry out two-way data transmission.

var sotk = null;
var socketOpen = false;
var wsbasePath = "ws://Developer server wss interface address/“;

//start websoket
  webSocketStart(e){
    sotk = wx.connectSocket({
      url: wsbasePath,
      header: { 'content-type': 'application/x-www-form-urlencoded' },
      method: "POST",
      success: res => {
        console.log('Applet connected successfully:', res);
      },
      fail: err => {
        console.log('Something went wrong!!' + err);
        wx.showToast({
          title: 'Network exception!',
        })
      }
    })

    this.webSokcketMethods();

  },

//Monitor command
  webSokcketMethods(e){
    let that = this;
    sotk.onOpen(res => {
      socketOpen = true;
      console.log('Monitor WebSocket Connection open event.', res);
    })
    sotk.onClose(onClose => {
      console.log('Monitor WebSocket Connection close event.', onClose)
      socketOpen = false;
    })
    sotk.onError(onError => {
      console.log('Monitor WebSocket Mistake. error message', onError)
      socketOpen = false
    })

    sotk.onMessage(onMessage => {
      var data = JSON.parse(onMessage.data);
      console.log('Monitor WebSocket Message event received to the server. Messages returned by the server',data);
     
    })
   
  },

//send message
  sendSocketMessage(msg) {
    let that = this;
    if (socketOpen){
      console.log('adopt WebSocket Connect to send data', JSON.stringify(msg))
      sotk.send({
        data: JSON.stringify(msg)
      }, function (res) {
        console.log('has been sent', res)
      })
    }
    
  },
 //Close connection
  closeWebsocket(str){
    if (socketOpen) {
      sotk.close(
        {
          code: "1000",
          reason: str,
          success: function () {
            console.log("Close successfully websocket Connect");
          }
        }
      )
    }
  },