Am trying to connect to a socket using Xamarin Binding project for RedPark's RedSocket SDK.Am getting the below error lwip_connect: invalid address" failed at line 495 in /Users/jeremy/Dev/Folsom/Folsom_570/RecEthernet/tcp/api/sockets.c But I dont see any user exists with that name in m...
netconn_sendto() 函数用于向通过 netconn 结构体表示的网络连接发送数据到指定的目标地址 发送数据:netconn_sendto() 函数将应用程序提供的数据发送到指定的目标地址。应用程序可以通过将数据写入 netconn 结构体的发送缓冲区来准备要发送的数据。 目标地址指定:与 netconn_send() 函数不同的是,netconn_sendto(...
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void udp_input (struct pbuf *p, struct netif *inp); 1. 2. 3. 二,udp数据输出 代码提供了多个udp输出的函数,这些函数各自实现一部分功能,最后都要调用udp_sendto_if_src()函数把数据交给ip层。 例如:udp_send()将pbuf发送到udp_pcb中记录的目的地址。其实它调用了udp_sendto(),而udp_sendto()中由...
udp_hdr *udphdr; /* UDP首部 */ err_t err; struct pbuf *q; /* 组装好的UDP报文,用于推到发送缓冲区 */ u8_t ip_proto; /* IP协议 */ u8_t ttl; /* TTL */ LWIP_ASSERT_CORE_LOCKED(); /* 内核锁内 */ /* 校验必要参数 */ LWIP_ERROR("udp_sendto_if_src: invalid pcb", pcb...
*itcansendthemmoreefficientlybycombiningthemtogether). *Topromptthesystemtosenddatanow,calltcp_output()after *callingtcp_write(). 【src\core\tcp_out.c】 err_ttcp_write(structtcp_pcb*pcb,constvoid*data,u16_tlen,u8_tapiflags) { /*connectionisinvalidstatefordatatransmission?*/ if(pcb-state==EST...
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示例1: udp_sendto_if ▲点赞 9▼ /** * Send data to a specified address using UDP. * The netif used for sending can be specified. * * This function exists mainly for DHCP, to be able to send UDP packets * on a netif that is still down. ...
then we have to free the pbuf! */ pbuf_free(p); goto end; } } else { LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: not for us.\n")); #if LWIP_ICMP || LWIP_ICMP6 /* No match was found, send ICMP destination port unreachable unless destination address was broadcast/...
所以最终boss是函数udp_sendto_if_src();,该函数就是填充了udp的首部,并传递给ip层,其中关于校验和计算的宏会比较复杂 //将pbuf填充并交给ip层err_tudp_sendto_if_src(structudp_pcb *pcb,structpbuf *p,constip_addr_t*dst_ip,u16_tdst_port,structnetif *netif,constip_addr_t*src_ip){structudp_hd...