[siwg917] 공유기 mac 얻기, arp table에서 확인.

1. arp 요청함수.

#include "lwip/netif.h"

#include "lwip/ip4_addr.h"

#include "lwip/etharp.h"

#define ARP_RETRY_COUNT 10

#define ARP_WAIT_MS 100

void request_and_print_gateway_mac(const sl_net_wifi_client_profile_t *profile, struct netif *netif)

{

ip4_addr_t gateway_ip;

IP4_ADDR(&gateway_ip,

profile->ip.ip.v4.gateway.bytes[0],

profile->ip.ip.v4.gateway.bytes[1],

profile->ip.ip.v4.gateway.bytes[2],

profile->ip.ip.v4.gateway.bytes[3]);

// 1. ARP 요청 전송

if (etharp_request(netif, &gateway_ip) != ERR_OK) {

printf("Failed to send ARP request to gateway\r\n");

return;

}

// 2. ARP 응답 대기 및 MAC 주소 찾기

struct eth_addr *eth_ret;

const ip4_addr_t *resolved_ip;

for (int i = 0; i < ARP_RETRY_COUNT; i++) {

if (etharp_find_addr(netif, &gateway_ip, &eth_ret, &resolved_ip) >= 0) {

printf("Gateway MAC: %02X:%02X:%02X:%02X:%02X:%02X\r\n",

eth_ret->addr[0], eth_ret->addr[1], eth_ret->addr[2],

eth_ret->addr[3], eth_ret->addr[4], eth_ret->addr[5]);

return;

}

osDelay(100); // FreeRTOS 기반 대기

}

printf("Gateway MAC: [Not found in ARP cache after ARP request]\r\n");

}

2. 업데이트된 arp테이블에서 mac 보기. (함수일부)

void display_client_network_info(sl_net_wifi_client_profile_t profile)

{

printf("\r\n=== Wi-Fi Client Network Information ===\r\n");

printf("SSID: %s\r\n", profile.config.ssid.value);

printf("Security: %d\r\n", profile.config.security);

// IP 정보 표시

printf("\r\n--- IP Configuration ---\r\n");

printf("IP Management Mode: %s\r\n",

profile.ip.mode == SL_IP_MANAGEMENT_DHCP ? "DHCP" :

profile.ip.mode == SL_IP_MANAGEMENT_STATIC_IP ? "Static IP" : "Link Local");

if (profile.ip.type & SL_IPV4) {

printf("IPv4 Address: %d.%d.%d.%d\r\n",

profile.ip.ip.v4.ip_address.bytes[0],

profile.ip.ip.v4.ip_address.bytes[1],

profile.ip.ip.v4.ip_address.bytes[2],

profile.ip.ip.v4.ip_address.bytes[3]);

printf("Subnet Mask: %d.%d.%d.%d\r\n",

profile.ip.ip.v4.netmask.bytes[0],

profile.ip.ip.v4.netmask.bytes[1],

profile.ip.ip.v4.netmask.bytes[2],

profile.ip.ip.v4.netmask.bytes[3]);

printf("Gateway: %d.%d.%d.%d\r\n",

profile.ip.ip.v4.gateway.bytes[0],

profile.ip.ip.v4.gateway.bytes[1],

profile.ip.ip.v4.gateway.bytes[2],

profile.ip.ip.v4.gateway.bytes[3]);

// Gateway MAC 주소 표시

struct netif *netif = netif_default; // 또는 Wi-Fi에 해당하는 netif 지정

ip4_addr_t gateway_ip;

struct eth_addr *eth_ret;

const ip4_addr_t *resolved_ip;

IP4_ADDR(&gateway_ip,

profile.ip.ip.v4.gateway.bytes[0],

profile.ip.ip.v4.gateway.bytes[1],

profile.ip.ip.v4.gateway.bytes[2],

profile.ip.ip.v4.gateway.bytes[3]);

if (etharp_find_addr(netif, &gateway_ip, &eth_ret, &resolved_ip) >= 0) {

printf("Gateway MAC: %02X:%02X:%02X:%02X:%02X:%02X\r\n",

eth_ret->addr[0], eth_ret->addr[1], eth_ret->addr[2],

eth_ret->addr[3], eth_ret->addr[4], eth_ret->addr[5]);

} else {

printf("Gateway MAC: [Not found in ARP cache]\r\n");

}

}

}

3. 실행위치

static void application_start(void *argument)

{

UNUSED_PARAMETER(argument);

sl_status_t status;

sl_ip_address_t ip_address = { 0 };

sl_net_wifi_client_profile_t profile = { 0 };

sl_wifi_performance_profile_t performance_profile = { .profile = ASSOCIATED_POWER_SAVE_LOW_LATENCY };

status = sl_net_init(SL_NET_WIFI_CLIENT_INTERFACE, &client_configuration, &wifi_client_context, NULL);

if (status != SL_STATUS_OK) {

printf("Failed to start Wi-Fi Client interface: 0x%lx\r\n", status);

return;

}

printf("Wi-Fi Client interface success\r\n");

#ifdef SLI_SI91X_MCU_INTERFACE

uint8_t xtal_enable = 1;

status = sl_si91x_m4_ta_secure_handshake(SL_SI91X_ENABLE_XTAL, 1, &xtal_enable, 0, NULL);

if (status != SL_STATUS_OK) {

printf("Failed to bring m4_ta_secure_handshake: 0x%lx\r\n", status);

return;

}

printf("m4_ta_secure_handshake Success\r\n");