// h file
namespace TestLib
{
	typedef enum
	{
		telegramFormat_1 = 0,
		telegramFormat_2,
	}st_telegramFormat;


	typedef struct
	{
		uint16_t length;
		uint8_t* telegramData;
	}st_telegramData;


	bool CheckTelegram(st_telegramData telegramCheck);

}

// cpp file
namespace TestLib
{
	bool CheckTelegram(st_telegramData telegramToCheck)
	{
		return false;
	}
}

// Verwendung

#include <TestLib.h>

uint8_t testtelegramm[100] = { 0xBE, 0x44, 0xC5, 0x14, 0x77, 0x55, 0x44, 0x33, 0x00, 0x04,  0x4E, 0x2F };

int main()
{
    TestLib::st_telegramData testtelegramm{ 0x00, 0, 0, TestLib::telegramFormat_1, 0, telegrammPayload };
    TestLib::CheckTelegram(testtelegramm);
}