Posted on August 12, 2017 at 08:55Hi
2 questions here:
1. Why do I need the osDelay(1) before netbuff_delete()? Without it I get a statistical bug/crash.
2. why do I need lines x1-x3. Without it no second connection is possible.
/*----------------------------------------------------------------------
-------------*/
static void udpecho_thread(void *arg)
{
err_t err, recv_err;
LWIP_UNUSED_ARG(arg);
uint8_t send_buffer[32]={0xff};
uint16_t len = 0;
conn = netconn_new(NETCONN_UDP);
if (conn!= NULL)
{
err = netconn_bind(conn, IP_ADDR_ANY, ARTNET_PORT);
if (err == ERR_OK)
{
while (1)
{
recv_err = netconn_recv(conn, &buf);
if (recv_err == ERR_OK)
{
addr = netbuf_fromaddr(buf);
port = netbuf_fromport(buf);
len = netbuf_len(buf);
if (len < 700)
netbuf_copy(buf, &MyData, len);
if (len > 32)
netbuf_ref ( buf,send_buffer , 32);
netconn_connect(conn, addr, port);
netconn_send(conn,buf);
// why do i need this delay??????????
osDelay(1);
netbuf_delete(buf);
//if I uncomment this 3 lines , every thing works fine
//X1 netconn_delete(conn);
//X2 conn = netconn_new(NETCONN_UDP);
//X3 err = netconn_bind(conn, IP_ADDR_ANY, ARTNET_PORT);
}
else
{
netconn_delete(conn);
}
}
}
}
}
#lwip #stm32 #netconn #free-rtos
