RTKernel-32

RTFiles-32

RTIP-32

RTIP-32 Programming Manual

RTIP-32 Reference Manual

RTIP-32 Configuration

Socket API

Simplified Networking API

Extended RTIP-32 API

Function vf_init

Function xn_add_dns_server

Function xn_add_host_table_entry

Function xn_clear_host_cache

Function xn_delete_host_table_entry

Function xn_get_domain_name

Function xn_has_dns

Function xn_set_domain_name

Function xn_set_server_list

Function xn_name2ip_addr

Function xn_abort

Function xn_arp_send

Function xn_attach

Function xn_bootp_res

Function xn_bootp

Function xn_debug_error

Function xn_getlasterror

Function xn_geterror_string

Function xn_interface_close

Function xn_interface_info

Function xn_interface_mcast

Function xn_interface_open

Function xn_interface_open_config

Function xn_interface_opt

Function xn_interface_ethernet_statistics

Function xn_interface_statistics

Function xn_ip_set_option

Function xn_ping

Function xn_pkt_data_max

Function xn_rarp

Function xn_rt_add

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_arp_cache_lookup

xn_arp_cache_lookup can be used to lookup an IP address in the ARP cache:

int xn_arp_cache_lookup(BYTE * ipn, BYTE * hw_addr, DWORD * ttl);

Parameters

ipn

Pointer to the IP address in network byte order to be looked up.

hw_addr

Pointer to a 6 byte buffer to receive the hardware (MAC) address associated with *ipn. This parameter is optional and may be set to NULL.

ttl

Pointer to a variable to receive the number of seconds remaining in the timeout of this cache entry. The cache entry will expires after (*ttl) seconds. This parameter is optional and may be set to NULL.

return value

Returns 0 if successful, otherwise SOCKET_ERROR. If an error occurred, call xn_getlasterror and xn_geterror_string to return the error value. Error code EINVAL is returned if *ipn was not found in the cache or EWOULDBLOCK if RTIP-32 is currently waiting for an ARP reply from address *ipn). Section Error Codes further describes each error.

ARP cache entries have a configurable live-time (see CFG_ARP_TIMEOUT, default 10 minutes). This function can be used to query if an address on the local LAN segment is resolved and when it will expire. To avoid communication pauses due to ARP queries, the application can call xn_arp_remote before an ARP cache entry expires to refresh and reset its timeout.

Left Extended RTIP-32 API

Function xn_arp_remote

Down Function xn_send_ethernet_frame