Added a comment to descript a for loop behaviour.

firmware/firmware.ino

@@ -526,7 +526,7 @@ void _fsm_loop()
       //debug("send data to influxdb if required");
 #ifdef INFLUXDB_FEATURE
       for (uint8_t i = 0; i < 5 and validData == false; i++)
-      {
+      { // only check sensor data 0 to 4 -> SENSOR_TEMPERATURE, SENSOR_HUMIDITY, SENSOR_LIGHT, SENSOR_WINDSPEED, SENSOR_PRESSURE
         if (currentSensorData[i] != 0 and currentSensorData[i] != nanf("no value") and (not isnan(currentSensorData[i])))
         {
           validData = true;