update Code

libraries/MQTT_Client/examples/LowPowerHello/LowPowerHello.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/
+ *
+ * If the libraries Arduino Low Power and RTC Zero are included then Cooperative Multitasking
+ * uses LowPower.idle(...) instead of delay(...).
+ *
+ * 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 <ArduinoLowPower.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);
+  tasks.after(10000, checkWiFi); // after 10 seconds call checkWiFi()
+  tasks.after(10000, checkBroker); // after 10 seconds call checkBroker()
+  tasks.after(30000, publishHello); // after 30 seconds call publishHello()
+}
+
+void loop() {
+  tasks.run();
+}
+
+void checkWiFi() {
+  switch (WiFi.status()) {
+    case WL_CONNECT_FAILED:
+    case WL_CONNECTION_LOST:
+    case WL_DISCONNECTED:
+      Serial.println("wifi not connected");
+      WiFi.begin(ssid, pass);
+      tasks.after(10000, checkWiFi); // after 10 seconds call checkWiFi()
+      //
+      return;
+  }
+  //
+  tasks.after(30000, checkWiFi); // after 30 seconds call checkWiFi()
+}
+
+void checkBroker() {
+  if (!mqttclient.connected()) {
+    Serial.println("mqtt client not connected");
+    mqttclient.connect();
+  }
+  //
+  tasks.after(30000, checkBroker); // after 30 seconds call checkBroker()
+}
+
+void publishHello() {
+  if (mqttclient.connected()) topic.publish("Hello");
+  //
+  tasks.after(30000, publishHello); // after 30 seconds call publishHello()
+}