INT_32_T masterIpcAyt ( PTR_T ipchandle /* pointer to IPC handle */ )
This is an "are you there" routine. The SNMP master agent calls this routine whenever it needs to do a status check on the IPC link to the address ipchandle. This routine puts a null-buffer message of type IPC_AYT on the subagent's message queue. If the subagent replies with a message of the same type, the link is considered active.