Release v1.4.0 (#11)

* refactor websocket / power usage

* cooldown between api requests during testing

* refactor power state methods

* remove unused code

* cooldown between api requests during testing

* version bump

classes/WebSocket.js

@@ -0,0 +1,55 @@
+const W3CWebSocket = require('websocket').w3cwebsocket;
+const WebSocketAsPromised = require('websocket-as-promised');
+const delay = require('delay');
+
+class WebSocket {
+  /**
+   * Open WebSocket connection and send provided payloads
+   *
+   * @param url
+   * @param payloads
+   * @param delayTime
+   *
+   * @returns {Array}
+   */
+  static async WebSocketRequest(url, payloads, ...{ delayTime = 1000 }) {
+    const wsp = new WebSocketAsPromised(url, {
+      createWebSocket: wss => new W3CWebSocket(wss),
+    });
+
+    const responses = [];
+    wsp.onMessage.addListener(message => responses.push(JSON.parse(message)));
+
+    try {
+      await wsp.open();
+
+      for (const payload of payloads) {
+        await wsp.send(payload);
+        await delay(delayTime);
+      }
+
+      await wsp.close();
+    } catch (e) {
+      return this.customThrowError(e);
+    }
+
+    return responses;
+  }
+
+  /**
+   * Parse WebSocket errors and return user friendly messages
+   *
+   * @param e
+   *
+   * @returns {{error: string}|{msg: string, error: number}}
+   */
+  static customThrowError(e) {
+    const loginError = e.message.indexOf('WebSocket is not opened');
+    if (loginError > -1) {
+      return { error: 401, msg: 'Authentication error' };
+    }
+    return { error: 'An unknown error occurred' };
+  }
+}
+
+module.exports = WebSocket;