// WiFi Monitor — portable scanner on ESP32-C3 // Creates an AP, scans nearby networks, shows live stats on a web page. // Walk around with it plugged into a power bank, view on your phone. #include #include #include #include WebServer web(80); bool apMode = true; const char PAGE[] PROGMEM = R"HTML( WiFi Monitor

📶 WiFi Monitor

Network	CH	Signal	Strength	MAC

)HTML"; void setup() { Serial.begin(115200); delay(300); Serial.println("\nWiFi Monitor"); // AP mode — connect your phone to see the scanner WiFi.mode(WIFI_AP); uint8_t mac[6]; esp_read_mac(mac, ESP_MAC_WIFI_SOFTAP); char apName[32]; snprintf(apName, sizeof(apName), "WiFi-Mon-%02X%02X", mac[4], mac[5]); WiFi.softAP(apName, nullptr, 6, 0, 4); Serial.printf("AP: %s -> http://192.168.4.1\n", apName); web.on("/", []() { web.send_P(200, "text/html", PAGE); }); web.on("/scan.json", []() { int n = WiFi.scanNetworks(false, true); // async=false, show_hidden=true String j = "["; for (int i = 0; i < n; i++) { if (i) j += ","; String ssid = WiFi.SSID(i); ssid.replace("\\", "\\\\"); ssid.replace("\"", "\\\""); if (ssid.length() == 0) ssid = "(hidden)"; char macStr[18]; uint8_t* bssid = WiFi.BSSID(i); snprintf(macStr, sizeof(macStr), "%02x:%02x:%02x:%02x:%02x:%02x", bssid[0], bssid[1], bssid[2], bssid[3], bssid[4], bssid[5]); j += "{\"ssid\":\"" + ssid + "\",\"ch\":" + WiFi.channel(i) + ",\"rssi\":" + WiFi.RSSI(i) + ",\"open\":" + (WiFi.encryptionType(i) == WIFI_AUTH_OPEN ? "true" : "false") + ",\"mac\":\"" + String(macStr) + "\"}"; } j += "]"; WiFi.scanDelete(); web.send(200, "application/json", j); }); web.begin(); Serial.println("ready — open http://192.168.4.1 on your phone"); } void loop() { web.handleClient(); delay(1); }