enum tcp_state {CLOSED = 0, //連接斷開沒有連接LISTEN = 1, //服務器進入偵聽狀態SYN_SENT = 2, //連接請求已發送等待確認SYN_RCVD = 3, //已接收到對方的連接請求ESTABLISHED = 4, //連接已建立FIN_WAIT_1 = 5, //程序以關閉連接FIN_WAIT_2 = 6, //另一端程序已關閉連接CLOSE_WAIT = 7, //等待程序關閉連接CLOSING = 8, //兩端同時收到對方關閉連接請求LAST_ACK = 9, //服務器等待對方接受關閉請求TIME_WAIT = 10 //關閉成功等待網絡中可能出現得到剩余數據 };

LWIP的回調函數

#if LWIP_CALLBACK_API/* Function to be called when more send buffer space is available. */tcp_sent_fn sent;/* Function to be called when (in-sequence) data has arrived. */tcp_recv_fn recv;/* Function to be called when a connection has been set up. */tcp_connected_fn connected;/* Function which is called periodically. */tcp_poll_fn poll;/* Function to be called whenever a fatal error occurs. */tcp_err_fn errf; #endif /* LWIP_CALLBACK_API */

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