Question

我正在尝试将数据从MIMXRT1062发送到PC，并且已设置UDP Echo Server。代码如下：

struct netconn *conn;
struct netbuf *buf_rcv;
char buffer[200];
conn = netconn_new(NETCONN_UDP);
netconn_bind(conn, IP_ADDR_ANY, 9007); 
LWIP_ERROR("udpecho: invalid conn", (conn != NULL), return;);

while (1) {

err = netconn_recv(conn, &buf_rcv);

printf("address: %d\n port: %d\n",netbuf_fromaddr(buf_rcv),netbuf_fromport(buf_rcv));
if (err == ERR_OK) {
 //no need netconn_connect here, since the netbuf contains the address
  if(netbuf_copy(buf_rcv, buffer, sizeof(buffer)) != buf_rcv->p->tot_len) {
    printf("netbuf_copy failed\n");
  } else {
    buffer[buf_rcv->p->tot_len] = '\0';

    printf("Received: %s\r\n",buffer);

    err = netconn_send(conn, buf_rcv);
    if(err != ERR_OK) {
      LWIP_DEBUGF(LWIP_DBG_ON, ("netconn_send failed: %d\n", (int)err));
      printf("netconn_send failed!\r\n");
    } else {
      LWIP_DEBUGF(LWIP_DBG_ON, ("got %s\n", buffer));
    }
}
  netbuf_delete(buf_rcv);

}

我已使用此代码成功将数据回显到PC。但是我希望能够在调试期间查看数据，但是当我尝试

时

printf("Received: %s\r\n",buffer);

不打印数据。作为附带说明，我最终想将数据发送到PC而不接收数据，我尝试了以下代码：

 ip_addr_t ipaddr;

 conn = netconn_new(NETCONN_UDP);
 netconn_connect(conn, IP_ADDR_ANY, 9007);
while(1){
        buf = netbuf_new();
        netbuf_ref(buf,buffer, sizeof(buffer));

        if(netconn_send(conn, buf)==ERR_OK){
          printf("Sending %s\r\n",buffer);
        }
        else{
          printf("Sending failed\r\n");
        }
        netbuf_delete(buf);
}
netconn_close(conn);
netconn_delete(conn);

代码只是echo的修改版本。回显有效，但我无法显示正在回显的数据，而在其他版本中，PC端看不到已发送的数据。我不确定自己在做什么错。帮助将不胜感激。谢谢！

如何从UDP NetConnection打印接收的数据

0 个答案: