70 lines
2.2 KiB
C
70 lines
2.2 KiB
C
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#include "esp_event_base.h"
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#include "esp_log.h"
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#include "mqtt_client.h"
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#include <stdint.h>
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#include <string.h>
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static const char *TAG = "mqtt"; // Logs are coming from this mqtt module
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static uint32_t MQTT_CONNECTED = 0;
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static int s_retry_num = 0;
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#define MQTT_TOPIC "/topic/test"
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#define MQTT_BROKER "mqtt://192.168.178.53:1883"
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#define MAX_RETRY 5
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esp_mqtt_client_handle_t mqtt_connect();
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static void mqtt_event_handler(void *handler_args, esp_event_base_t base,
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int32_t event_id, void *event_data)
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{
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if (event_id == MQTT_EVENT_CONNECTED) {
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ESP_LOGI(TAG, "Connected to MQTT broker.");
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MQTT_CONNECTED = 1;
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}
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if (event_id == MQTT_EVENT_PUBLISHED) {
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// Cast event which is void to a specific type provided by ESP-IDF
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// Then dereference and get `msg_id` field
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esp_mqtt_event_handle_t event = (esp_mqtt_event_handle_t)event_data;
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ESP_LOGI(TAG, "Message published succesfully, msg_id: %d", (*event).msg_id);
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}
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if (event_id == MQTT_EVENT_DISCONNECTED) {
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MQTT_CONNECTED = 0;
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ESP_LOGI(TAG, "Disconnected from MQTT broker. Attempting to reconnect.");
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if (s_retry_num < MAX_RETRY) {
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mqtt_connect();
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s_retry_num++;
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ESP_LOGI(TAG, "Retrying MQTT connection.");
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} else {
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ESP_LOGI(TAG, "Could not connect to MQTT broker. Giving up.");
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}
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}
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}
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esp_mqtt_client_handle_t mqtt_connect()
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{
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ESP_LOGI(TAG, "Attempting to connect to MQTT broker %s", MQTT_BROKER);
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esp_mqtt_client_config_t mqtt_config = {.broker.address.uri = MQTT_BROKER};
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esp_mqtt_client_handle_t client = esp_mqtt_client_init(&mqtt_config);
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esp_mqtt_client_register_event(client, ESP_EVENT_ANY_ID, mqtt_event_handler,
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client);
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esp_mqtt_client_start(client);
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return client;
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}
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void mqtt_publish(esp_mqtt_client_handle_t client, const char *payload)
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{
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if (MQTT_CONNECTED) {
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ESP_LOGI(TAG, "Publishing payload %s to topic %s", payload, MQTT_TOPIC);
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esp_mqtt_client_publish(client, MQTT_TOPIC, payload, strlen(payload), 0, 0);
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} else {
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ESP_LOGI(TAG, "Could not publish to MQTT topic %s. Not connected to broker",
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MQTT_TOPIC);
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}
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}
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// https://github.com/ESP32Tutorials/esp32-mqtt-pub-sub-esp-idf/blob/main/main/app_main.c
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