Pass by reference

lorawan.h

@@ -40,7 +40,7 @@ namespace lorawan {
   extern String last_transmission;
   void initialize();
   void process();
-  void preparePayloadIfTimeHasCome(int16_t co2, float temp, float hum);
+  void preparePayloadIfTimeHasCome(const int16_t &co2, const float &temp, const float &hum);
 }
 
 #endif

mqtt.cpp

@@ -207,7 +207,7 @@ namespace mqtt {
     }
   }
 
-  void publishIfTimeHasCome(const String &timeStamp, int16_t co2, float temp, float hum) {
+  void publishIfTimeHasCome(const String &timeStamp, const int16_t &co2, const float &temp, const float &hum) {
     // Send message via MQTT according to sending interval
     unsigned long now = seconds();
     //TODO: Send average since last MQTT message?

mqtt.h

@@ -15,6 +15,6 @@ namespace mqtt {
   extern String last_successful_publish;
   void initialize(String &topic);
   void keepConnection();
-  void publishIfTimeHasCome(const String &timeStamp, int16_t co2, float temp, float hum);
+  void publishIfTimeHasCome(const String &timeStamp, const int16_t &co2, const float &temp, const float &hum);
 }
 #endif