Function xn_pkt_data_max

Function xn_rt_cycle_gw

Function xn_rt_del

Function xn_rt_replace

Function xn_rtip_exit

Function xn_rtip_init

Function xn_rtip_restart

Function xn_set_ip

Function xn_tcp_is_connect

Function xn_tcp_is_read

Function xn_tcp_is_write

Function xn_wait_tcp_output

Function xn_autoanswer

Function xn_autologin

Function xn_hangup

Function xn_scriptlogin

Function xn_autoip

Function xn_ioacc_init

Function xn_nat_init

Function xn_arp_add

Function xn_arp_del

Function xn_arp_remote

Function xn_arp_cache_lookup

Function xn_send_ethernet_frame

Function xn_callbacks

Function cb_wr_screen_string_fnc

Function cb_rs232_connection_lost_fnc

Function cb_error_report_fnc

Function cb_raw_mode_in_char_fnc

Function cb_autoip_new_ip_fnc

Function cb_autoip_no_ip_fnc

Function cb_packetin_isr

Function cb_packetin_task

Function cb_packetout

Function xn_pkt_data_max

Maximum number of bytes transferable per packet.

int xn_pkt_data_max(SOCKET socket, BYTE * dest_ip_addr);

Parameters

socket

Socket returned by socket.

dest_ip_addr

Destination IP address (UDP only).

return value

An integer indicating how many bytes are available in the user area of a packet or SOCKET_ERROR on error. If an error occurred, call xn_getlasterror and xn_geterror_string to return the error value. Error Codes further describes each error.

Possible values for this function are:

Value	Meaning
ENOTINITIALIZED	RTIP-32 has not been initialized (xn_rtip_init has not been called).
ENOTSOCK	Invalid socket descriptor.
ENOTCONN	Socket is not connected.

The packet structure is of fixed length and contains preamble information. This routine returns the number of bytes available for user data in the packet.

For UDP and RAW, the return value is based upon the MTU value for the interface which will be used to send messages for this socket. The interface will be determined by the dest_ip_addr parameter. For TCP, the return value depends upon the maximum segment size from the device table and the other side's MSS value sent in the initial SYNC message.

The specified socket must be connected.

Left Extended RTIP-32 API

Function xn_ping

Down Function xn_rarp