diff --git a/hardware/include/JsonTools.hpp b/hardware/include/JsonTools.hpp
index 19786b4..098758c 100644
--- a/hardware/include/JsonTools.hpp
+++ b/hardware/include/JsonTools.hpp
@@ -11,6 +11,7 @@
 #include "MAX7219.hpp"
 #endif
 
+#if DEVICE_ROLE == SENSOR
 String serializeSensorValue(
     int groupId,
     const String &deviceId,
@@ -20,6 +21,7 @@ String serializeSensorValue(
     const BME280Data_t &bme,
     const MQ7Data_t &mq7,
     const GPSData_t &gps);
+#endif
 
 #if DEVICE_ROLE == ACTUATOR
 MAX7219Status_t deserializeActuatorStatus(HTTPClient &http, int httpResponseCode);
diff --git a/hardware/include/globals.hpp b/hardware/include/globals.hpp
index e87717f..5014f23 100644
--- a/hardware/include/globals.hpp
+++ b/hardware/include/globals.hpp
@@ -2,7 +2,7 @@
 
 #include <Arduino.h>
 
-#define DEVICE_ROLE SENSOR // se cambia entre SENSOR y ACTUATOR
+#define DEVICE_ROLE ACTUATOR // se cambia entre SENSOR y ACTUATOR
 
 #define MQTT_URI "miarma.net"
 #define API_URI "https://contaminus.miarma.net/api/v1/"
diff --git a/hardware/src/lib/http/JsonTools.cpp b/hardware/src/lib/http/JsonTools.cpp
index 5d7ebf1..90b4e52 100644
--- a/hardware/src/lib/http/JsonTools.cpp
+++ b/hardware/src/lib/http/JsonTools.cpp
@@ -1,5 +1,6 @@
 #include "JsonTools.hpp"
 
+#if DEVICE_ROLE == SENSOR
 String serializeSensorValue(
     int groupId,
     const String &deviceId,
@@ -39,6 +40,7 @@ String serializeSensorValue(
 #endif
   return output;
 }
+#endif
 
 #if DEVICE_ROLE == ACTUATOR
 MAX7219Status_t deserializeActuatorStatus(HTTPClient &http, int httpResponseCode)