if (tcp_sndbuf(c_pcb) > strlen(msg)) { err = tcp_write(c_pcb, msg, strlen(msg), TCP_WRITE_FLAG_COPY); if (err != ERR_OK) xil_printf("tcp_server: Error on tcp_write: %d\r\n", err); err = tcp_output(c_pcb); if (err != ERR_OK) xil_printf("tcp_server: Error on ...
TCP/IP是互联网最基本的协议,是互联网通信使用的网络协议,由网络层的IP协议和传输层的TCP协议组成。TCP/IP只有四个分层,分别为应用层、传输层、网络层以及网络访问层。虽然TCP/IP分层少了,但与OSI模型是不冲突的,它把OSI模型一些层次整合一起的,本质上可以实现相同功能。 实际上,还有一个TCP/IP混合模型,分为五...
tcp_echoserver_pcb =tcp_new();if(tcp_echoserver_pcb !=NULL) {// printf("create a new pcb\n");err_terr;// bind local IP to designated port (TCP_SERVER_PORT)err =tcp_bind(tcp_echoserver_pcb, IP_ADDR_ANY, TCP_SERVER_PORT);if(err == ERR_OK){//printf(" binding pcb successfull...
/* if tcp send buffer has enough space to hold the data we want to transmit from PL, then start tcp transmission*/ if (tcp_sndbuf(tpcb) > SEND_SIZE) { /*transmit received data through TCP*/ err = tcp_write(tpcb, RxBufferPtr[packet_index & 1], SEND_SIZE, copy); if (err != ...
解耦:编写回调函数xxx_tcp()、xxx_udp(),注册到协议栈里面。协议栈通过回调函数告知接口层,当前PCB的状态信息。接口层根据当前PCB的状态信息做相应处理即可。 文件: api_msg.c:构建api msg,被netconn调用,发送到内核锁或tcpip内核线程执行指定的回调函数。
echoclient是自定义的一个结构体类型,包含了TCP从设备的状态、TCP协议控制块指针和发送数据指针。tcp_echoclient_disconnect函数用于断开TCP连接,通过调用tcp_echoclient_connection_close函数实现,它有两个形参,一个是TCP协议控制块,一个是echoclient类型指针。
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tcp_write +#define altcp_output tcp_output + +#define altcp_mss tcp_mss +#define altcp_sndbuf tcp_sndbuf +#define altcp_sndqueuelen tcp_sndqueuelen +#define altcp_nagle_disable tcp_nagle_disable +#define altcp_nagle_enable tcp_nagle_enable +#define altcp_nagle_disabled tcp_nagle_disabled ...
因为tcp_receive函数在收到数据后,会把窗口缩小,表示接收数据的空间被刚收到的数据占用了,所以你在tcp_receive中可以看到这样的语句, pcb->rcv_wnd -= tcplen; pcb->rcv_wnd -= TCP_TCPLEN(cseg); 故而,在应用层处理完这些数据后,要通知LWIP,这些空间可以恢复到原来大小了,那些数据已经用过了。
2. Call tcp_sndbuf() to find the maximum amount of data that can be sent. 3. Call tcp_write() to enqueue the data. 4. Call tcp_output() to force the data to be sent. u6ttpsdu(tuttppb*pb 1_ c_nbfsrc c_c c) Returns the number of bytes of space available in the output ...