Hey! Actually, this was investigated previously by Dennis Giese here (https://recon.cx/2018/brussels/resources/slides/RECON-BRX-2018-Reversing-IoT-Xiaomi-ecosys

Hey! Actually, this was investigated previously by Dennis Giese here (https://recon.cx/2018/brussels/resources/slides/RECON-BRX-2018-Reversing-IoT-Xiaomi-ecosystem.pdf https://recon.cx/2018/brussels/resources/slides/RECON-BRX-20...). He also has a number of related talks (https://dontvacuum.me/talks/topics.html https://dontvacuum.me/talks/topics.html). Seems like quite a number of things including WiFi SSID and lat/long info are sent.