update Code

libraries/MQTT_Client/examples/Hello/Hello.ino

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+/*
+ * Publishes "Hello" at regular intervals. The message can be subscribed and observed in HiveMQs
+ * Websockets client http://www.hivemq.com/demos/websocket-client/
+ *
+ * Copyright (C) 2018 Andreas Motzek andreas-motzek@t-online.de
+ *
+ * You can use, redistribute and/or modify this file under the terms of the Modified Artistic License.
+ * See http://simplysomethings.de/open+source/modified+artistic+license.html for details.
+ *
+ * This file is distributed in the hope that it will be useful, but without any warranty; without even
+ * the implied warranty of merchantability or fitness for a particular purpose.
+ */
+
+#include <Client.h>
+#include <WiFi101.h>
+#include <CooperativeMultitasking.h>
+#include <MQTTClient.h>
+
+char ssid[] = "...";
+char pass[] = "...";
+char host[] = "broker.hivemq.com";
+char clientid[] = " ";
+char topicname[] = "amotzek/hello";
+
+CooperativeMultitasking tasks;
+WiFiClient wificlient;
+MQTTClient mqttclient(&tasks, &wificlient, host, 1883, clientid, NULL, NULL);
+MQTTTopic topic(&mqttclient, topicname);
+
+void setup() {
+  Serial.begin(9600);
+  //
+  while (!Serial) {
+    delay(1000);
+  }
+  //
+  WiFi.begin(ssid, pass);
+  delay(10000);
+}
+
+void loop() {
+  if (mqttclient.connect()) {
+    topic.publish("Hello");
+    //
+    while (tasks.available()) {
+      tasks.run();
+    }
+    //
+    mqttclient.disconnect();
+  }
+  //
+  switch (WiFi.status()) {
+    case WL_CONNECT_FAILED:
+    case WL_CONNECTION_LOST:
+    case WL_DISCONNECTED: WiFi.begin(ssid, pass);
+  }
+  //
+  delay(30000);
+}