[HOTFIX] Check client readyState before sending pings (#605)

React Native WebSocket library throw an error when a message is sent through the socket while its state is still "CONNECTING".
Fix this issue by preventing send pings until its "OPEN"

Author: Yoann-Abbes

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "kuzzle-sdk",
-  "version": "7.5.4",
+  "version": "7.5.5",
   "description": "Official Javascript SDK for Kuzzle",
   "author": "The Kuzzle Team <[email protected]>",
   "repository": {

package.json

@@ -102,14 +102,15 @@ export default class WebSocketProtocol extends BaseProtocolRealtime {
           clearTimeout(this.pongTimeoutId);
         });
       }
-
       this.client.onopen = () => {
         this.clientConnected();
         /**
-         * Send pings to the server
+        * Send pings to the server
         */
         this.pingIntervalId = setInterval(() => {
-          this.ping();
+          if (this.client.readyState === 1) {
+            this.ping();
+          }
           this.pongTimeoutId = setTimeout(() => {
             const error: any = new Error('Connection lost.');
             error.status = 503;

src/protocols/WebSocket.ts

@@ -52,6 +52,7 @@ export abstract class BaseProtocolRealtime extends KuzzleAbstractProtocol {
     this.state = 'connected';
     this.wasConnected = true;
     this.stopRetryingToConnect = false;
+
   }
 
   /**