Pass by reference

lorawan.cpp

@@ -183,7 +183,7 @@ namespace lorawan {
     }
   }
 
-  void preparePayloadIfTimeHasCome(int16_t co2, float temperature, float humidity) {
+  void preparePayloadIfTimeHasCome(const int16_t &co2, const float &temperature, const float &humidity) {
     static unsigned long last_sent_at = 0;
     unsigned long now = seconds();
     if (now - last_sent_at > config::lorawan_sending_interval) {