[1] S. Schulz, K. J. Buchenrieder and J. W. Rozenblit, Multilevel testing for design verification of embedded systems, in IEEE Design & Test of Computers, vol. 19, no. 2, pp. 60-69, March-April 2002.

[2] H.P.E. Vranken, M.F. Witteman, and R.C. Van Wuijtswinkel, Design for Testability in HardwareSoftware Systems, in IEEE Design & Test of Computers, vol. 13, no. 3, Fall 1996, pp. 79-87.

[3] Elm Chan FAT-FS Front page for the open source implementation of FAT- FS. Retrieved from http://elmchan.org/fsw/ff/00index_e.html

[4] SIM800 TCP/IP application note. Retrieved from https://cdnshop.adafruit.com/datasheets/sim800_ series_ip_application_note_v1.00.pdf