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//----------------------------------------------------------------------------- 
// TCP.H 
// 
//----------------------------------------------------------------------------- 
 
// TCP states 
#define STATE_CLOSED					0 
#define STATE_LISTEN					1 
#define STATE_SYN_RCVD				2 
#define STATE_ESTABLISHED			3 
#define STATE_CLOSE_WAIT			4 
#define STATE_LAST_ACK				5 
#define STATE_FIN_WAIT_1			6 
#define STATE_FIN_WAIT_2			7 
#define STATE_CLOSING				8 
#define STATE_TIME_WAIT				9 
 
 
// TCP flag bits 
#define FLG_FIN						0x0001 
#define FLG_SYN						0x0002 
#define FLG_RST						0x0004 
#define FLG_PSH						0x0008 
#define FLG_ACK						0x0010 
#define FLG_URG						0x0020 
 
 
// Miscellaneous 
#define NO_CONNECTION  			5  
#define TCP_TIMEOUT				4		// = 2 seconds 
#define INACTIVITY_TIME			30		// = 15 seconds 
 
void tcp_send(UINT, UINT, UCHAR); 
void tcp_rcve(UCHAR xdata *, UINT); 
void tcp_retransmit(void); 
void tcp_inactivity(void); 
void init_tcp(void);