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ESP32 foundation library for MQTT based HomeIOT
#include <Arduino.h>
using std::string;
#include <freertos/queue.h>
QueueHandle_t mqttQueue;
typedef struct {
string name;
string metric;
} mqttMessage;
// EspMqtt.
#include "EspMQTT.h"
EspMQTT mqtt;
void mqtt_callback(std::string param, std::string value);
void mqttSetup() {
uint16_t debugLevel = 0;
if (debugLevel) {
mqtt.debugLevel = debugLevel;
mqtt.setAvailabilityInterval(5);
}
// MqTT:
mqtt.setWiFi("wifi-name", "wifi-pass", "hostname");
mqtt.setMqtt("mqtt-server", "mqtt-user", "mqtt-pass");
mqtt.setCommonTopics("my/root/topic/dir", "ds18b20");
mqtt.setCallback(mqtt_callback);
mqtt.start(true);
}
// Main.cpp Setup.
void setup() {
mqttSetup();
mqttQueue = xQueueCreate(10, sizeof(mqttMessage));
}
// Main.cpp Loop.
float counter = 1.1;
void loop() {
if (xQueueReceive(mqttQueue, &message, 100 / portTICK_PERIOD_MS) == pdFALSE) {
mqtt.publishMetric(message.name, message.metric);
// printf("mqtt [%s] push = %s\n", msg.name.c_str(), msg.metric.c_str());
}
else {
counter += 0.1;
char data[10];
sprintf(data, "%.2f", counter);
string metric = std::string(data);
mqttMessage msg = {"temperature", metric};
xQueueSend(mqttQueue, &msg, portMAX_DELAY);
}
vTaskDelay(5000 / portTICK_PERIOD_MS);
}
void mqtt_callback(std::string param, std::string value) {
uint16_t val = atoi(value.c_str());
printf("%s=%s\n", param.c_str(), message.c_str());
}