Volevo usare la scheda WN722N per monitorare il traffico Esp-Now usando WireShark...il fatto e' che la scheda e' riconosciuta da Debian 11 ma non entrava in monitor mode mentre usando ParrotOs funzionava perfettamente.
La soluzione e' ricompilare il modulo usando questo link
git clone https://github.com/gglluukk/rtl8188eus
make &make install
e eliminando il modulo di defualt
sudo echo 'blacklist r8188eu'|sudo tee -a '/etc/modprobe.d/realtek.conf'
al riavvio si puo' monitorare il traffico mediante questi comandi
sudo iw wlx9c532268fdca set monitor control
sudo ip link set wlx9c532268fdca up
sudo wireshark
per selezionare il traffico proveniente da un determinato MAC si puo'usare
wlan.sa==xx:xx:xx:xx:xx:xx
========================================================
/*
ESP-NOW Demo - Transmit
esp-now-demo-xmit.ino
Sends data to Responder
DroneBot Workshop 2022
https://dronebotworkshop.com
https://dronebotworkshop.com/esp-now/
*/
// Include Libraries
#include <esp_wifi.h>
#include <esp_now.h>
#include <WiFi.h>
// Variables for test data
int int_value;
// MAC Address of responder - edit as required
uint8_t broadcastAddress[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
esp_interface_t current_esp_interface;
wifi_interface_t current_wifi_interface;
// Define a data structure
typedef struct struct_message {
char a[32];
int b;
} struct_message;
// Create a structured object
struct_message myData;
// Peer info
esp_now_peer_info_t peerInfo;
// Callback function called when data is sent
void OnDataSent(const uint8_t *mac_addr, esp_now_send_status_t status) {
Serial.print("\r\nLast Packet Send Status:\t");
Serial.println(status == ESP_NOW_SEND_SUCCESS ? "Delivery Success" : "Delivery Fail");
}
void setup() {
int_value = 0;
Serial.begin(115200);
WiFi.mode(WIFI_STA);
esp_wifi_set_protocol(current_wifi_interface, WIFI_PROTOCOL_LR);
if (esp_now_init() != ESP_OK) {
Serial.println("Error initializing ESP-NOW");
return;
}
esp_now_register_send_cb(OnDataSent);
memcpy(peerInfo.peer_addr, broadcastAddress, 6);
peerInfo.channel = 0;
peerInfo.encrypt = false;
if (esp_now_add_peer(&peerInfo) != ESP_OK){
Serial.println("Failed to add peer");
return;
}
}
void loop() {
strcpy(myData.a, "Luca");
int_value++;
myData.b = int_value;
esp_err_t result = esp_now_send(broadcastAddress, (uint8_t *) &myData, sizeof(myData));
if (result == ESP_OK) {
Serial.println("Sending confirmed");
}
else {
Serial.println("Sending error");
}
delay(1000);
}
========================================================Per leggere i pacchetti ESP-NOW a linea di comando si puo' usare tcpdump oppure un progetto Go che utilizza le libreria Pcap https://pkg.go.dev/github.com/google/gopacket/pcap
