WiFi and Bluetooth security is probably the easiest to learn about, but other networks are just as vulnerable when an RTL-SDR is used. Another option Flipper Zero, a hacking gadget for Sub-1 GHz ...
The WiFi feature of the Mini appears to be for ... and his efforts to breathe new life into gadgets through firmware hacking. His replacement firmware for the Xiaomi LYWSD03MMC Bluetooth ...