diff --git a/main/main.c b/main/main.c
index dc6cb1d..ab7335c 100644
--- a/main/main.c
+++ b/main/main.c
@@ -107,15 +107,22 @@ int8_t bme280_readout(){
 
 void bme280_task(void *pvParameter){
    int8_t ret = 1;
+   char msgbuf[128];
    while (1) {
       ret = bme280_readout();
       if (ret == 0) {
          post_data_http(client.bme280, "bme280", "bedroom-bme280-01",
                comp_data.temperature, comp_data.humidity, comp_data.pressure / 100.);
+
+         snprintf(msgbuf, sizeof(msgbuf), "bme280: %.2f C, %.2f %%, %.2f hPa",
+               comp_data.temperature, comp_data.humidity, comp_data.pressure / 100.);
+         ESP_LOGI(TAG, "bme2800: %s", msgbuf);
       }
       else {
          post_error_http(client.bme280, "bme280", "bedroom-bme280-01",
-               1, "some error");
+               ret, "some error");
+         snprintf(msgbuf, sizeof(msgbuf), "am2302: return code %d", ret);
+         ESP_LOGE(TAG, "bme280: %s", msgbuf);
       }
       // read_out every 2 sec
       vTaskDelay(BME280_READOUT_DELAY / portTICK_RATE_MS);
@@ -135,13 +142,13 @@ void DHT_task(void *pvParameter)
                getTemperature(), getHumidity());
          post_data_http(client.am2302,  "am2302", "bedroom-am2302-01",
                getTemperature(), getHumidity(), -1);
-         ESP_LOGI(TAG, "%s", msgbuf);
+         ESP_LOGI(TAG, "am2302: %s", msgbuf);
       }
       else {
          post_error_http(client.am2302, "am2302", "bedroom-am2302-01",
-               1, "some error");
+               ret, "some error");
          snprintf(msgbuf, sizeof(msgbuf), "am2302: return code %d", ret);
-         ESP_LOGE(TAG, "%s", msgbuf);
+         ESP_LOGE(TAG, "am2302: %s", msgbuf);
       }
       // -- wait at least 2 sec before reading again ------------
       // The interval of whole process must be beyond 2 seconds !!
@@ -151,8 +158,31 @@ void DHT_task(void *pvParameter)
 
 static void post_error_http(esp_http_client_handle_t client,
       char *sensor, char *sensor_description, int err_code, char *error_details){
+   char url[80];
+   snprintf(url, 80, "%s/%s", db_worker_root, sensor);
+   esp_http_client_config_t config = { .url = url, .event_handler = _http_event_handler};
+   client = esp_http_client_init(&config);
+   esp_http_client_set_method(client, HTTP_METHOD_POST);
+   esp_http_client_set_header(client, "Content-Type", "application/json");
+   // POST
+   char post_data[256];
+   snprintf(post_data, sizeof(post_data),
+         "{\"status\": %d, \"error\": \"%s\", \"sensor\": \"%s\"}",
+         err_code, error_details, sensor_description);
+   esp_http_client_set_post_field(client, post_data, strlen(post_data));
+   esp_err_t err = esp_http_client_perform(client);
 
-   /* snprintf(post_data, sizeof(post_data), "{\"status\": failed, \"error\": \"could not read from sensor\", \"sensor\": \"%s\"}", s); */
+   if (err == ESP_OK) {
+      ESP_LOGI(TAG, "%s: HTTP POST Status = %d, content_length = %d",
+            sensor,
+            esp_http_client_get_status_code(client),
+            esp_http_client_get_content_length(client));
+   } else {
+      ESP_LOGE(TAG, "%s: HTTP POST request failed: %s",
+            sensor, esp_err_to_name(err));
+   }
+
+   esp_http_client_cleanup(client);
 }
 
 static void post_data_http(esp_http_client_handle_t client,
@@ -173,11 +203,13 @@ static void post_data_http(esp_http_client_handle_t client,
    esp_err_t err = esp_http_client_perform(client);
 
    if (err == ESP_OK) {
-      ESP_LOGI(TAG, "HTTP POST Status = %d, content_length = %d",
+      ESP_LOGI(TAG, "%s: HTTP POST Status = %d, content_length = %d",
+            sensor,
             esp_http_client_get_status_code(client),
             esp_http_client_get_content_length(client));
    } else {
-      ESP_LOGE(TAG, "HTTP POST request failed: %s", esp_err_to_name(err));
+      ESP_LOGE(TAG, "%s: HTTP POST request failed: %s",
+            sensor, esp_err_to_name(err));
    }
 
    esp_http_client_cleanup(client);