Create socket connection and send a message

src/app.js

@@ -1,4 +1,5 @@
 import React from 'react';
+import io from 'socket.io-client';
 
 export default class App extends React.Component {
     constructor(props) {
@@ -8,9 +9,30 @@ export default class App extends React.Component {
             ioState: {
                 dout: [false],
             },
+            socket: io.connect()
         }
     }
 
+    componentDidMount() {
+        this.connect();
+    }
+
+    componentWillUnmount() {
+        this.setState({socket: this.state.socket.removeAllListeners()});
+    }
+
+    connect() {
+        let socket = this.state.socket;
+
+        socket.on('connect', () => {
+            console.log('connected');
+        });
+
+        socket.on('message', (data) => {
+            console.log(data);
+        });
+    }
+
     doutSet(pin, value) {
         this.setState({
             ioState: {