This is an adaptation of the WiFi promiscuous mode demo code from Arduino
See https://www.hackster.io/rayburne/esp8266-mini-sniff-f6b93a
// Notes.h tab in Arduino IDE is only for comments and references! // based on RandDruid/esp8266-deauth (MIT) https://github.com/RandDruid/esp8266-deauth // inspired by kripthor/WiFiBeaconJam (no license) https://github.com/kripthor/WiFiBeaconJam // https://git.schneefux.xyz/schneefux/jimmiejammer/src/master/jimmiejammer.ino // requires SDK v1.3: install esp8266/Arduino from git and checkout commit 1c5751460b7988041fdc80e0f28a31464cdf97a3 // Modified by M. Ray Burnette for publication as WiFi Sniffer 20161013 /* Arduino 1.6.12 on Linux Mint 17.3 Sketch uses 227,309 bytes (21%) of program storage space. Maximum is 1,044,464 bytes. Global variables use 45,196 bytes (55%) of dynamic memory, leaving 36,724 bytes for local variables. Maximum is 81,920 bytes. */ /* // beacon template uint8_t template_beacon[128] = { 0x80, 0x00, 0x00, 0x00, /*4*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /*10*/ 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, /*16*/ 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, /*22*/ 0xc0, 0x6c, /*24*/ 0x83, 0x51, 0xf7, 0x8f, 0x0f, 0x00, 0x00, 0x00, /*32*/ 0x64, 0x00, /*34*/ 0x01, 0x04, /* SSID */ /*36*/ 0x00, 0x06, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x01, 0x08, 0x82, 0x84, 0x8b, 0x96, 0x24, 0x30, 0x48, 0x6c, 0x03, 0x01, /*56*/ 0x04 } ; * / /* Notes: Ref: http://www.esp8266.com/viewtopic.php?f=32&t=7025 In the ESP8266WiFi.h, there is the function getNetworkInfo() which I presume allows you to get info for hidden AP. bool getNetworkInfo(uint8_t networkItem, String &ssid, uint8_t &encryptionType, int32_t &RSSI, uint8_t* &BSSID, int32_t &channel, bool &isHidden); CODE: SELECT ALL /** loads all infos from a scanned wifi in to the ptr parameters @param networkItem uint8_t @param ssid const char* @param encryptionType uint8_t @param RSSI int32_t @param BSSID uint8_t * @param channel int32_t @param isHidden bool @return (true if ok) */ /* Serial Console Sample Output: ESP8266 mini-sniff by Ray Burnette http://www.hackster.io/rayburne/projects Type: /-------MAC------/-----WiFi Access Point SSID-----/ /----MAC---/ Chnl RSSI BEACON: <=============== [ TardisTime] 1afe34a08bc9 8 -76 BEACON: <=============== [ xfinitywifi] 56571a0730c0 11 -90 BEACON: <=============== [ ] 52571a0730c0 11 -91 BEACON: <=============== [ ATTGH6Gs22] 1005b1d6ff90 11 -95 BEACON: <=============== [ ATT4P3G9f8] 1c1448777420 11 -92 BEACON: <=============== [ HOME-30C2] 5c571a0730c0 11 -91 BEACON: <=============== [ ATT8Q4z656] b077acc4dfd0 11 -92 BEACON: <=============== [ HOME-B1C2] 94877c55b1c0 11 -94 BEACON: <=============== [ HUXU2012] 0c54a5d6e480 6 -94 BEACON: <=============== [ xfinitywifi] 0c54a5d6e482 6 -97 BEACON: <=============== [ ] 0c54a5d6e481 6 -96 DEVICE: 18fe34fdc2b8 ==> [ TardisTime] 1afe34a08bc9 8 -79 DEVICE: 18fe34f977a0 ==> [ TardisTime] 1afe34a08bc9 8 -94 DEVICE: 6002b4484f2d ==> [ ATTGH6Gs22] 0180c2000000 11 -98 BEACON: <=============== [ HOME-01FC-2.4] 84002da251d8 6 -100 DEVICE: 503955d34834 ==> [ ATT8Q4z656] 01005e7ffffa 11 -87 BEACON: <=============== [ ] 84002da251d9 6 -98 BEACON: <=============== [ xfinitywifi] 84002da251da 6 -95 BEACON: <=============== [ ] fa8fca34e26c 11 -94 DEVICE: cc0dec048363 ==> [ ATT8Q4z656] 01005e7ffffa 11 -88 BEACON: <=============== [ ] fa8fca95bad3 11 -92 BEACON: <=============== [ HOME-5475] 58238c3b5475 1 -96 BEACON: <=============== [ xfinitywifi] 5a238c3b5477 1 -94 BEACON: <=============== [ ] 5a238c3b5476 1 -96 DEVICE: 1859330bf08e ==> [ ATT8Q4z656] 01005e7ffffa 11 -92 BEACON: <=============== [ ] 92877c55b1c0 11 -92 DEVICE: f45fd47bd5e0 ==> [ ATTGH6Gs22] ffffffffffff 11 -93 BEACON: <=============== [ Lynch] 744401480a27 11 -96 BEACON: <=============== [ xfinitywifi] 96877c55b1c0 11 -93 DEVICE: f43e9d006c10 ==> [ xfinitywifi] 8485066ff726 6 -96 DEVICE: 285aeb4f16bf ==> [ ATTGH6Gs22] 3333ffb3c678 11 -94 DEVICE: 006b9e7fab90 ==> [ ATTGH6Gs22] 01005e7ffffa 11 -91 DEVICE: 78456155b9f0 ==> [ Lynch] 01005e7ffffa 11 -95 DEVICE: 6cadf84a419d ==> [ HOME-30C2] 88cb8787697a 11 -89 BEACON: <=============== [ Verizon-SM-G935V-6526] a608ea306526 11 -92 */