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Basic MQTT example with Authentication
- connects to an MQTT server, providing username
and password
- publishes "hello world" to the topic "outTopic"
- subscribes to the topic "inTopic"
#include <SPI.h>
#include <Ethernet.h>
#include <PubSubClient.h>
// Update these with values suitable for your network.
byte mac[] = { 0xDE, 0xED, 0xBA, 0xFE, 0xFE, 0xYY }; 7/Sustituir YY por número de puesto
IPAddress server(192, 168, 6, 72);
void callback(char* topic, byte* payload, unsigned int length) {
Serial.print("Message arrived [");
Serial.print("] ");
for (int i = 0; i < length; i++) {
EthernetClient ethClient;
PubSubClient client(server, 1883, callback, ethClient);
void setup()
// Note - the default maximum packet size is 128 bytes. If the
// combined length of clientId, username and password exceed this,
// you will need to increase the value of MQTT_MAX_PACKET_SIZE in
// PubSubClient.h
if (client.connect("arduinoClientXX", "curso_iot", "raspberry")) { //Sustituir XX por número de puesto
client.publish("outTopic", "hello world");
void loop()
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