This paper presents the technology and implementation results of manipulating the MAC and IP Address of the transmitting side in MCU(Microcontroller Unit), when data communication with remote APs is performed on CC3220 Wi-Fi module associated with STM32 MCU. Because the existing packet sending and receiving process also changes in the CRC as MAC and IP change, CRC checksum errors occur when MAC and IP are manipulated. The method presented in this paper reduces the resources required for computations to match the CRC checksum in the transmission and reception environment between MCU and external AP, and it also allows the sending-receiving and exchanging data with minimal manipulation.