200 struct tcp_pcb {  struct
207   u16_t remote_port;
209   tcpflags_t flags;
232   u8_t polltmr, pollinterval;
233   u8_t last_timer;
234   u32_t tmr;
237   u32_t rcv_nxt;   /* next seqno expected */
238   tcpwnd_size_t rcv_wnd;   /* receiver window available */
239   tcpwnd_size_t rcv_ann_wnd; /* receiver window to announce */
240   u32_t rcv_ann_right_edge; /* announced right edge of window */
243   s16_t rtime;
245   u16_t mss;   /* maximum segment size */
248   u32_t rttest; /* RTT estimate in 500ms ticks */
249   u32_t rtseq;  /* sequence number being timed */
250   s16_t sa, sv; /* @todo document this */
252   s16_t rto;    /* retransmission time-out */
253   u8_t nrtx;    /* number of retransmissions */
256   u8_t dupacks;
257   u32_t lastack; /* Highest acknowledged seqno. */
260   tcpwnd_size_t cwnd;
261   tcpwnd_size_t ssthresh;
264   u32_t snd_nxt;   /* next new seqno to be sent */
265   u32_t snd_wl1, snd_wl2; /* Sequence and acknowledgement numbers of last
290   struct tcp_pcb_listen* listener;  argument
295   tcp_sent_fn sent;
297   tcp_recv_fn recv;
299   tcp_connected_fn connected;
301   tcp_poll_fn poll;
303   tcp_err_fn errf;
307   u32_t ts_lastacksent;
308   u32_t ts_recent;
312   u32_t keep_idle;
314   u32_t keep_intvl;
315   u32_t keep_cnt;
319   u8_t persist_cnt;
343 err_t lwip_tcp_event(void *arg, struct tcp_pcb *pcb,  argument