lwip的send居然会阻塞? 最近调试LWIP(uCos下运行),发现一个问题: 在一个任务内不断进行发送(发送后任务挂起1s),用netconn_write来发送,然后在某一个时刻把网线拔掉,netconn_write还能执行几次,我的是还能执行9次,第10次执行netconn_write,就被阻塞了,仿真,发现最后是在tcpip_apimsg()里面阻塞掉了,因为这个函...
lwip send函数的原型如下: ``` err_t send(int socket, const void *dataptr, size_t size, int flags); ``` 其中,socket是要发送数据的套接字描述符,dataptr是数据的指针,size是数据的大小,flags是可选的标志位。 在使用lwip send函数发送数据之前,需要先创建一个套接字并建立连接,然后才能调用send函数...
Socket是应用层与TCP/IP协议族通信的中间软件抽象层，它是一组接口。在设计模式中，Socket其实就是一个...
This seems to work. When I remove the select() call, however, I get an error on the send() which sets errno to 119 or Connection already in progress. This error code isn't documented in the send() man pages. Can someone tell me why the select() command is even necessary here, ...
/* initialize LwIP tcp_poll callback function */ tcp_poll(tpcb, tcp_echoclient_poll, 1); /* send data */ tcp_echoclient_send(tpcb,es); return ERR_OK; } } else { /* close connection */ tcp_echoclient_connection_close(tpcb, es); ...
在lwip中, send\recv使用flag参数宏定义与内核不一致,导致参数设置无效 内核bits/socket.h: #define MSG_PEEK 0x02 #define MSG_WAITALL 0x100 #define MSG_OOB 0x01 #define MSG_DONTWAIT 0x40 #define MSG_MORE 0x8000 #define MSG_NOSIGNAL 0x4000 ...
assert failed: tcpip_send_msg_wait_sem IDF/components/lwip/lwip/src/api/tcpip.c:455 (Invalid mbox) UIS8910DM平台移值LwIP的方式和推荐的不太一样。 (1)没有创建 tcpip_thread 线程,把需要在 tcpip_thread 执行的代码,移植到 net_thread 线程上。该工作通过修改 tcpip_thread() 函数和异步调用函数...
Using lwip raw udp API, notice that only one UDP echo works then the device echoes back improperly after that (UDP packet seems to be malformed, missing payload) #include "lwip/api.h" #include "lwip/udp.h" void udp_echo_recv(void *arg, s...
assert failed: tcpip_send_msg_wait_sem IDF/components/lwip/lwip/src/api/tcpip.c:455 (Invalid mbox) Steps to reproduce. esp_http_client_config_t config = { .url = file_url.c_str(), .cert_pem = (char *) server_cert_pem_start, .timeout_ms = 600000, //.crt_bundle_attach = es...
ESP8266 ESP-01S Serial WIFI Wireless Transceiver Module 4MB Flash Send Receive LWIP AP+STA ESP-01 Advanced Version $1.14 - $1.33 Min. order: 100 pieces Easy Return DIYmall ESP32 Devkit Board ESP-WROOM-32 Dual Core 2.4G Wifi Bluetooth-compatible Development Board CP2102 for Arduino (36Pin)...