Simple Wifi AP Scanner
Flash onto ESP8266. Connect serial console/terminal on 76800baud. Device will continuously scan for available APs and dump the raw stats.
Auth stat is as per AUTH_MODE enum from SDK: 00 = No Auth (Open) 01 = WEP 02 = WPA 03 = WPA2 04 = WPA/WPA2
Compiled firmware is available in the firmware directory. Flash with esptool.