1、保证LWIP_TCP_KEEPALIVE被定义为1,(这样TCP_KEEPIDLE、TCP_KEEPINTVL和TCP_KEEPCNT 设置才有效) 2、 int32 keepalive = 1; int32 keepidle = 1; int32 keepinterval = 1; int32 keepcount = 1; int32 flag = 1; if(setsockopt(server_socket, SOL_SOCKET, SO_KEEPALIVE, (void *)&keepalive, ...
第一步:在opt.h中 LWIP_TCP_KEEPALIVE 置1 1 /** 2 * LWIP_TCP_KEEPALIVE==1: Enable TCP_KEEPIDLE, TCP_KEEPINTVL and TCP_KEEPCNT 3 * options processing. Note that TCP_KEEPIDLE and TCP_KEEPINTVL have to be set 4 * in seconds. (does not require sockets.c, and will affect tcp.c) ...
/* Check if KEEPALIVE should be sent */if(ip_get_option(pcb, SOF_KEEPALIVE) &&((pcb->state == ESTABLISHED) ||(pcb->state == CLOSE_WAIT))) {if((u32_t)(tcp_ticks - pcb->tmr) >(pcb->keep_idle + TCP_KEEP_DUR(pcb)) / TCP_SLOW_INTERVAL) {LWIP_DEBUGF(TCP_DEBUG, ("tcp_...
第一步:在opt.h中 LWIP_TCP_KEEPALIVE 置1 1/**2* LWIP_TCP_KEEPALIVE==1: Enable TCP_KEEPIDLE, TCP_KEEPINTVL and TCP_KEEPCNT3* options processing. Note that TCP_KEEPIDLE and TCP_KEEPINTVL have to be set4* in seconds. (does not require sockets.c, and will affect tcp.c)5*/6#if!
你傻啊，keepalive是保持活动的意思。意思就是说，不要关闭tcp。为了实现这项功能，带有keepalive ......
把LWIP中的keepalive功能打开之后，如果协议栈检测到TCP长时间不再发送数据就会把连接断开。如果我在网络...
把LWIP中的keepalive功能打开之后,如果协议栈检测到TCP长时间不再发送数据就会把连接断开。如果我在网络正常通信的情况下突然拔掉网线,等到协议栈把TCP连接断开后,再插上网线,但是却不能重新连接之前的TCP,怎么才能让原先的TCP重新连接进行通信呢,谁有好一点的方法?? 0 2020-4-6 04:36:18 评论 淘帖 邀请回答...
“在TCP的机制里面，本身是存在有心跳包的机制，也就是TCP选项 SO_KEEPALIVE。系统默认是设置的2小时的...
返回：ERR_OK表示发送成功或没有可发送的数据，其它表示出错。 3、void tcp_keepalive(struct tcp_pcb...
#define LWIP_TCP_KEEPALIVE1//tcp保活定时器 #define TCP_KEEPIDLE_DEFAULT60000//保活时间60s #define TCP_KEEPINTVL_DEFAULT10000//保活探测10s #define TCP_KEEPCNT_DEFAULT9U //*** // //---DEBUG_OPTIONS--- // //*** #define