The features of the 25-byte raw data are as follows: bytes 6. and 7. for sender node ID; byte 8. for the width of the packets in data part; byte 9. for group ID; bytes 10. for handler ID; bytes 11. and 12. for sender node ID; bytes 13. and 14. for sent node ID; bytes for 15. and 16. for temperature value; bytes 17. and 18. for humidity value; bytes 19. and 20. for light value; bytes 21. and 22. for voltage value. Figure 8 shows the 25-byte raw data transferred from the base station to the computer.