this fixes SCEX ping for RPi

linux/boardtest/UartTestClass.h

@@ -1,6 +1,7 @@
 #ifndef LINUX_BOARDTEST_UARTTESTCLASS_H_
 #define LINUX_BOARDTEST_UARTTESTCLASS_H_
 
+#include <fsfw/globalfunctions/DleEncoder.h>
 #include <termios.h>  // Contains POSIX terminal control definitions
 
 #include <array>
@@ -28,7 +29,10 @@ class UartTestClass : public TestTask {
 
   void scexInit();
   void scexPeriodic();
+  int prepareScexPing();
   TestModes mode = TestModes::GPS;
+  DleEncoder dleEncoder = DleEncoder();
+  size_t encodedLen = 0;
   lwgps_t gpsData = {};
   struct termios tty = {};
   int serialPort = 0;