Function utest_tc_init

components/net/utest/tc_netdev.c:973–1026

* @brief Unit test initialization function * * This function performs setup operations before running tests: * - Creates callback synchronization event * - Locates and configures the test network device * - Saves initial network configuration for restoration * - Waits for network connectivity to be established * - Sets the test network device as default * * @return rt_err_t RT_EOK on succ

 * @return rt_err_t RT_EOK on success, -RT_ERROR on failure
 */
static rt_err_t utest_tc_init(void)
{
    struct netdev *netdev_lwip = RT_NULL;

    /* Create event for callback synchronization */
    callback_event = rt_event_create("callback_event", RT_IPC_FLAG_FIFO);
    if (callback_event == RT_NULL)
    {
        rt_kprintf("Failed to create callback event\n");
        return -RT_ERROR;
    }

    netdev_lwip = netdev_get_by_name(RT_UTEST_DEFAULT_NETDEV_NAME);
    if (netdev_lwip == RT_NULL)
    {
        rt_kprintf("Network interface device not found!\n");
        return -RT_ERROR;
    }

    /* Save initial network configuration */
    initial_ip_addr = netdev_lwip->ip_addr;
    initial_netmask = netdev_lwip->netmask;
    initial_gw = netdev_lwip->gw;
    initial_dns0 = netdev_lwip->dns_servers[0];
    initial_dns1 = netdev_lwip->dns_servers[1];
    initial_dhcp_enabled = netdev_is_dhcp_enabled(netdev_lwip);

    rt_kprintf("Saved initial network config - IP: %s, DHCP: %s\n",
               inet_ntoa(initial_ip_addr),
               initial_dhcp_enabled ? "enabled" : "disabled");

    /* Wait for network connect successful */
    while (1)
    {
        if (!ip_addr_isany(&netdev_lwip->ip_addr))
        {
            rt_kprintf("IP address assigned: %s\n", inet_ntoa(netdev_lwip->ip_addr));
            break;
        }
        rt_thread_mdelay(500);
    }

    /* Save the old netdev */
    netdev_default_old = netdev_default;
    netdev_set_default(netdev_lwip);

    if (netdev_default == RT_NULL)
    {
        rt_kprintf("No default network interface!\n");
        return -RT_ERROR;
    }

    return RT_EOK;
}

/**
 * @brief Unit test cleanup function