Example when wifi is not connected

examples/client-without-wifi/client-without-wifi.ino

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+#include <TinyMqtt.h>   // https://github.com/hsaturn/TinyMqtt
+#include <Streaming.h>  // https://github.com/janelia-arduino/Streaming
+
+/** TinyMQTT allows a disconnected mode:
+ * 
+ *  In this example, local clients A and B are talking together, no need to be connected.
+ *  A single ESP can use this to be able to comunicate with itself with the power
+ *  of MQTT, and once connected still continue to work with others.
+ *  
+ */
+
+std::string topic="sensor/temperature";
+
+MqttBroker broker(1883);
+MqttClient mqtt_a(&broker);
+MqttClient mqtt_b(&broker);
+
+void onPublishA(const Topic& topic, const char* payload, size_t length)
+{ Serial << "--> A Received " << topic.c_str() << endl; }
+
+void onPublishB(const Topic& topic, const char* payload, size_t length)
+{ Serial << "--> B Received " << topic.c_str() << endl; }
+
+void setup()
+{
+  Serial.begin(115200);
+  delay(500);
+  Serial << "init" << endl;
+
+  mqtt_a.setCallback(onPublishA);
+  mqtt_a.subscribe(topic);
+
+  mqtt_b.setCallback(onPublishB);
+  mqtt_b.subscribe(topic);
+}
+
+void loop()
+{
+	broker.loop();
+  mqtt_a.loop();
+  mqtt_b.loop();
+
+  // ============= client A publish ================
+	static const int intervalA = 5000;
+	static uint32_t timerA = millis() + intervalA;
+	
+	if (millis() > timerA)
+	{
+		Serial << "A is publishing " << topic.c_str() << endl;
+		timerA += intervalA;
+		mqtt_a.publish(topic);
+	}
+
+  // ============= client B publish ================
+	static const int intervalB = 3000;	// will send topic each 5000 ms
+	static uint32_t timerB = millis() + intervalB;
+	
+	if (millis() > timerB)
+	{
+		Serial << "B is publishing " << topic.c_str() << endl;
+		timerB += intervalB;
+		mqtt_b.publish(topic);
+	}
+}