Function test_netdev_dhcp

components/net/utest/tc_netdev.c:235–296

* @brief Test DHCP functionality * * This function tests: * - DHCP disable operation * - DHCP state verification * - DHCP state restoration * - Network configuration stability after DHCP operations * * @note Includes retry mechanism to wait for network configuration restoration * to prevent interference with subsequent ping tests */

 *       to prevent interference with subsequent ping tests
 */
static void test_netdev_dhcp(void)
{
    rt_err_t res;
    rt_bool_t initial_state;
    ip_addr_t initial_ip, initial_gw;
    int retry_count = 0;
    const int max_retries = 10;

    /* Save initial network configuration for restoration */
    initial_state = netdev_is_dhcp_enabled(netdev_default);
    initial_ip = netdev_default->ip_addr;
    initial_gw = netdev_default->gw;
    rt_kprintf("Initial DHCP state: %s\n", initial_state ? "enabled" : "disabled");
    rt_kprintf("Initial IP: %s, Gateway: %s\n", inet_ntoa(initial_ip), inet_ntoa(initial_gw));

    /* Test DHCP disable operation */
    res = netdev_dhcp_enabled(netdev_default, RT_FALSE);
    if (res == RT_EOK)
    {
        uassert_false(netdev_is_dhcp_enabled(netdev_default));
        rt_kprintf("DHCP successfully disabled\n");
    }
    else
    {
        rt_kprintf("Failed to disable DHCP: error code %d\n", res);
        uassert_true(RT_FALSE);
        return;
    }

    /* Restore initial DHCP state */
    res = netdev_dhcp_enabled(netdev_default, initial_state);
    uassert_true(res == RT_EOK);

    /* Wait for network configuration to stabilize after DHCP restoration */
    if (initial_state)
    {
        rt_kprintf("Waiting for DHCP to restore network configuration...\n");
        while (retry_count < max_retries)
        {
            rt_thread_mdelay(1000); /* Wait 1000ms between checks */

            /* Check if IP and gateway are properly restored */
            if (!ip_addr_isany(&netdev_default->ip_addr) &&
                    !ip_addr_isany(&netdev_default->gw))
            {
                rt_kprintf("Network configuration restored after %d retries\n", retry_count);
                rt_kprintf("Current IP: %s, Gateway: %s\n",
                           inet_ntoa(netdev_default->ip_addr),
                           inet_ntoa(netdev_default->gw));
                break;
            }
            retry_count++;
        }

        /* Fail the test if network configuration is not restored within timeout */
        if (retry_count >= max_retries)
        {
            rt_kprintf("Failed: Network configuration not fully restored within timeout\n");