/* Wifi MAC as char array */
static char device_id[32] = {0};
static esp_err_t http_event_handler(esp_http_client_event_t *evt) {
return ESP_OK;
}
static esp_err_t send_to_victoriametrics(const char *payload)
{
/*
* My setup uses valid certificates from LetsEncrypt and is
* also fronted by a Nginx which handles authentification
*/
esp_http_client_config_t config = {
.url = "https://my.vicmetrics.instance/api/v1/import/prometheus",
.event_handler = http_event_handler,
.timeout_ms = 5000,
.auth_type = HTTP_AUTH_TYPE_BASIC,
.username = "super",
.password = "secret",
.crt_bundle_attach = esp_crt_bundle_attach,
};
esp_http_client_handle_t client = esp_http_client_init(&config);
if (!client) {
ESP_LOGE(TAG, "HTTP client init failed");
return ESP_FAIL;
}
esp_http_client_set_method(client, HTTP_METHOD_POST);
esp_http_client_set_header(client, "Content-Type", "text/plain");
esp_err_t err = esp_http_client_set_post_field(client, payload, strlen(payload));
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to set POST body: %s", esp_err_to_name(err));
esp_http_client_cleanup(client);
return err;
}
err = esp_http_client_perform(client);
if (err != ESP_OK) {
ESP_LOGE(TAG, "HTTP POST failed: %s", esp_err_to_name(err));
esp_http_client_cleanup(client);
return err;
}
int status = esp_http_client_get_status_code(client);
if (status < 200 || status >= 300) {
ESP_LOGE(TAG, "VictoriaMetrics returned HTTP %d", status);
esp_http_client_cleanup(client);
return ESP_FAIL;
}
esp_http_client_cleanup(client);
return ESP_OK;
}
static void send_metrics_to_vm(
uint16_t pm1, uint16_t pm25, uint16_t pm4, uint16_t pm10,
int16_t hum, int16_t temp, int16_t voc, int16_t nox, uint16_t co2)
{
char payload[2048];
int64_t ts_s = time(NULL);
snprintf(payload, sizeof(payload),
"sens66_pm1{device=\"%s\"} %u %" PRId64 "\n"
"sens66_pm25{device=\"%s\"} %u %" PRId64 "\n"
"sens66_pm4{device=\"%s\"} %u %" PRId64 "\n"
"sens66_pm10{device=\"%s\"} %u %" PRId64 "\n"
"sens66_humidity{device=\"%s\"} %d %" PRId64 "\n"
"sens66_temperature{device=\"%s\"} %d %" PRId64 "\n"
"sens66_voc{device=\"%s\"} %d %" PRId64 "\n"
"sens66_nox{device=\"%s\"} %d %" PRId64 "\n"
"sens66_co2{device=\"%s\"} %u %" PRId64 "\n",
device_id, pm1, ts_s,
device_id, pm25, ts_s,
device_id, pm4, ts_s,
device_id, pm10, ts_s,
device_id, hum, ts_s,
device_id, temp, ts_s,
device_id, voc, ts_s,
device_id, nox, ts_s,
device_id, co2, ts_s
);
ESP_LOGI(TAG, "Sending metrics:\n%s", payload);
esp_err_t err = send_to_victoriametrics(payload);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to send metrics to VictoriaMetrics");
}
}
static void task_example(void *pvParameters)
{
uint8_t mac[6];
/* MAC will never change. So only read once. */
esp_efuse_mac_get_default(mac);
snprintf(device_id, sizeof(device_id),
"%02X:%02X:%02X:%02X:%02X:%02X",
mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
(...)
}
