Is anyone into that?
rtl-sdr dongle:
https://hackaday.com/2019/07/31/rtl-sdr-seven-years-later/
https://www.rtl-sdr.com/about-rtl-sdr/
hacking the coffee machine:
http://blog.rona.fr/post/2017/10/15/Sniffing-and-decoding-NFC-with-a-DVB-T-stick-rtl-sdr-and-GNURadio
DSP course where in the final project students are asked to send images using a Baofeng UV-5R and receive them with an RTL-SDR:
https://inst.eecs.berkeley.edu/~ee123/sp16/index.html