refactor: more conditionals for GPS

also re-added some missing returns.

src/helpers/sensors/EnvironmentSensorManager.cpp

@@ -127,14 +127,16 @@ bool EnvironmentSensorManager::querySensors(uint8_t requester_permissions, Cayen
 
 int EnvironmentSensorManager::getNumSettings() const {
   #if ENV_INCLUDE_GPS
-  return gps_detected ? 1 : 0;  // only show GPS setting if GPS is detected
+    return gps_detected ? 1 : 0;  // only show GPS setting if GPS is detected
   #endif
+  return NULL;
 }
 
 const char* EnvironmentSensorManager::getSettingName(int i) const {
   #if ENV_INCLUDE_GPS
-  return (gps_detected && i == 0) ? "gps" : NULL;
+    return (gps_detected && i == 0) ? "gps" : NULL;
   #endif
+  return NULL;
 }
 
 const char* EnvironmentSensorManager::getSettingValue(int i) const {

src/helpers/sensors/EnvironmentSensorManager.h

@@ -36,11 +36,11 @@ protected:
   bool INA3221_initialized = false;
   bool INA219_initialized = false;
   
-  LocationProvider* _location;
   bool gps_detected = false;
   bool gps_active = false;
 
   #if ENV_INCLUDE_GPS
+  LocationProvider* _location;
   void start_gps();
   void stop_gps();
   void initBasicGPS();
@@ -48,7 +48,11 @@ protected:
 
 
 public:
+  #if ENV_INCLUDE_GPS
   EnvironmentSensorManager(LocationProvider &location): _location(&location){};
+  #else
+  EnvironmentSensorManager(){};
+  #endif
   bool begin() override;
   bool querySensors(uint8_t requester_permissions, CayenneLPP& telemetry) override;  
   #if ENV_INCLUDE_GPS

variants/promicro/target.cpp

@@ -1,7 +1,9 @@
 #include <Arduino.h>
 #include "target.h"
 #include <helpers/ArduinoHelpers.h>
-#include <helpers/sensors/MicroNMEALocationProvider.h>
+
+#if ENV_INCLUDE_GPS
+#endif
 
 PromicroBoard board;
 
@@ -11,8 +13,13 @@ WRAPPER_CLASS radio_driver(radio, board);
 
 VolatileRTCClock fallback_clock;
 AutoDiscoverRTCClock rtc_clock(fallback_clock);
-MicroNMEALocationProvider nmea = MicroNMEALocationProvider(Serial1);
-EnvironmentSensorManager sensors = EnvironmentSensorManager(nmea);
+#if ENV_INCLUDE_GPS
+  #include <helpers/sensors/MicroNMEALocationProvider.h>
+  MicroNMEALocationProvider nmea = MicroNMEALocationProvider(Serial1);
+  EnvironmentSensorManager sensors = EnvironmentSensorManager(nmea);
+#else
+  EnvironmentSensorManager sensors;
+#endif
 
 #ifdef DISPLAY_CLASS
   DISPLAY_CLASS display;