only count seconds_since_reset when logging is enabled

FDRS_Gateway/FDRS_Gateway.ino

@@ -145,7 +145,7 @@ void loop() {
 
   timeClient.update();  //update internal clock if possible
   #endif
-  #ifndef USE_WIFI
+  #if defined (USE_SD_LOG) || defined (USE_FS_LOG)
   unsigned long current_millis = millis();
   if(current_millis-last_millis >= 1000){
     seconds_since_reset+=(current_millis-last_millis)/1000;

FDRS_Gateway/fdrs_functions.h

@@ -88,12 +88,9 @@ uint8_t LoRa2[] =         {mac_prefix[3], mac_prefix[4], LORA2_PEER};
 //uint8_t LoRaAddress[] = {0x42, 0x00};
 #endif
 
-#ifndef USE_WIFI
+#if defined (USE_SD_LOG) || defined (USE_FS_LOG)
 unsigned long last_millis = 0;
 unsigned long seconds_since_reset = 0;
-#endif
-
-#if defined (USE_SD_LOG) || defined (USE_FS_LOG)
 char logBuffer[512];
 uint16_t logBufferPos = 0; // datatype depends on size of sdBuffer
 #endif