CC3200 的SL_NETAPP_IP_RELEASED_EVENT事件怎么被触发

在AP模式中，触发的是SL_NETAPP_IP_LEASED_EVENT事件，程序顺序执行，所以没有触发

void SimpleLinkNetAppEventHandler(SlNetAppEvent_t *pNetAppEvent)
{
    switch(pNetAppEvent->Event)
    {
        case SL_NETAPP_IPV4_IPACQUIRED_EVENT:
        case SL_NETAPP_IPV6_IPACQUIRED_EVENT:
        {
            SET_STATUS_BIT(g_ulStatus, STATUS_BIT_IP_AQUIRED);
        }
        break;
        
        case SL_NETAPP_IP_LEASED_EVENT:
        {
            SET_STATUS_BIT(g_ulStatus, STATUS_BIT_IP_LEASED);
        
            g_ulStaIp = (pNetAppEvent)->EventData.ipLeased.ip_address;
            
            UART_PRINT("[NETAPP EVENT] IP Leased to Client: IP=%d.%d.%d.%d , ",
                        SL_IPV4_BYTE(g_ulStaIp,3), SL_IPV4_BYTE(g_ulStaIp,2),
                        SL_IPV4_BYTE(g_ulStaIp,1), SL_IPV4_BYTE(g_ulStaIp,0));
        }
        break;
        
        case SL_NETAPP_IP_RELEASED_EVENT:
        {
            CLR_STATUS_BIT(g_ulStatus, STATUS_BIT_IP_LEASED);

            UART_PRINT("[NETAPP EVENT] IP Released for Client: IP=%d.%d.%d.%d , ",
                        SL_IPV4_BYTE(g_ulStaIp,3), SL_IPV4_BYTE(g_ulStaIp,2),
                        SL_IPV4_BYTE(g_ulStaIp,1), SL_IPV4_BYTE(g_ulStaIp,0));

        }
        break;

        default:
        {
            UART_PRINT("[NETAPP EVENT] Unexpected event [0x%x] \n\r",
                       pNetAppEvent->Event);
        }
        break;
    }
}