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Simple_MQTT_Connection.ino
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Simple_MQTT_Connection.ino
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// Library for w5100 or similar
//#include <Ethernet.h>
// Library for Enc28j60 or similar
#include <UIPEthernet.h>
// Bliblioteca Mqtt
#include <PubSubClient.h>
//Mac address
byte mac[] = {0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};
// Configures Broker Access
const char *mqtt_broker = "server"; // server
const char *mqtt_username = "usename"; // usename
const char *mqtt_password = "password"; // password
const int mqtt_port = 1883; // port tcp
char topic_A = "topic";
char sub_A = "sub";
// client id
#define client_id "client_id"
EthernetClient ethClient;
PubSubClient client(ethClient);
void setup() {
Serial.begin(9600);
Ethernet.begin(mac);
if (Ethernet.begin(mac) == 0) {
Serial.println("Failed to connect network: mac"); // prints on serial network connection error, possibly mac(?) error
Ethernet.begin(mac);
while (true);
}
Serial.print("Device IP: ");
Serial.println(Ethernet.localIP()); //Device IP DHCP
// Prepare connection to Broker
client.setServer(mqtt_broker, mqtt_port);
client.setCallback(callback);
}
//starts connection to broker
void reconnect() {
while (!client.connected()) {
Serial.println("Connecting to the broker.....");
if (client.connect(client_id, mqtt_username, mqtt_password)) {
Serial.println("Connected to broker");
// subscribe to topic
client.subscribe(sub_A);
} else {
Serial.print("Failure: ");
Serial.print(client.state());
delay(3000);
}
}
}
void callback(char *topic, byte *payload, unsigned int length) {
Serial.print("Payload: ");
Serial.print(topic);
Serial.print("/");
if (strcmp(topic, topic_A) == 0) {
String message;
for (int i = 0; i < length; i++) {
message = message + (char) payload[i]; // convert *byte to string
}
Serial.println(message);
/*if (message == "exemple") {
//code...
}*/
}
}
void loop() {
if (!client.connected()) {
reconnect();
}
client.loop();
}