49 lines
1.4 KiB
Arduino
49 lines
1.4 KiB
Arduino
|
// Platform compatibility: espressif8266
|
||
|
|
|
||
|
|
#include <Arduino.h>
|
||
|
|
#include <Ethernet.h>
|
||
|
|
|
||
|
|
#include <PicoMQTT.h>
|
||
|
|
|
||
|
|
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
|
||
|
|
|
||
|
|
EthernetClient client;
|
||
|
|
PicoMQTT::Client mqtt(client, "broker.hivemq.com");
|
||
|
|
|
||
|
|
unsigned long last_publish_time = 0;
|
||
|
|
int greeting_number = 1;
|
||
|
|
|
||
|
|
void setup() {
|
||
|
|
Serial.begin(115200);
|
||
|
|
|
||
|
|
Serial.println("Connecting to network...");
|
||
|
|
Ethernet.init(5); // ss pin
|
||
|
|
while (!Ethernet.begin(mac)) {
|
||
|
|
Serial.println("Failed, retrying...");
|
||
|
|
}
|
||
|
|
Serial.println(Ethernet.localIP());
|
||
|
|
|
||
|
|
// Subscribe to a topic and attach a callback
|
||
|
|
mqtt.subscribe("picomqtt/#", [](const char * topic, const char * payload) {
|
||
|
|
// payload might be binary, but PicoMQTT guarantees that it's zero-terminated
|
||
|
|
Serial.printf("Received message in topic '%s': %s\n", topic, payload);
|
||
|
|
});
|
||
|
|
|
||
|
|
mqtt.begin();
|
||
|
|
}
|
||
|
|
|
||
|
|
void loop() {
|
||
|
|
mqtt.loop();
|
||
|
|
|
||
|
|
// Publish a greeting message every 3 seconds.
|
||
|
|
if (millis() - last_publish_time >= 3000) {
|
||
|
|
// We're publishing to a topic, which we're subscribed too.
|
||
|
|
// The broker should deliver the messages back to us.
|
||
|
|
String topic = "picomqtt/esp-" + WiFi.macAddress();
|
||
|
|
String message = "Hello #" + String(greeting_number++);
|
||
|
|
Serial.printf("Publishing message in topic '%s': %s\n", topic.c_str(), message.c_str());
|
||
|
|
mqtt.publish(topic, message);
|
||
|
|
last_publish_time = millis();
|
||
|
|
}
|
||
|
|
}
|