Echelon ISI - Manual (Page 44)

ISI Programmer’s Guide 42
// (CSME) message.
IsiCreateEnrollment(Assembly);
break;
... // Processing for other states
} // End of switch(state)
}
// IsiUpdateUserInterface is called with isiApprovedHost as the
// IsiEvent parameter in response to receiving a CSME;
// IsiUpdateUserInterface is called with isiImplemented as the
// IsiEvent parameter in response to invoking
// IsiExtendEnrollement() or IsiCreateEnrollment()
void IsiUpdateUserInterface(IsiEvent Event, unsigned Parameter) {
if (Event == isiApprovedHost){
SetConnectLed(LED_ON);
}
else if (Event == isiImplemented || Event == isiCancelled) {
isiState = isiNormal;
SetConnectLED(LED_OFF);
}
... //Processing for other events
}
Canceling a Connection
You can cancel a pending enrollment on the connection host at any stage, and on
any device that has accepted the connection invitation. Cancellation is no longer
possible once the connection is implemented; see
Deleting a Connection for these
cases.
Pending enrollment sessions are automatically cancelled if:
• On the connection host, if no connection enrollment acceptance message
(CSME) is received within T
enroll
after the IsiOpenEnrollment() function call.
• On the connection host, if the connection is not implemented by a
IsiCreateEnrollment() or IsiExtendEnrollment() function call within T
enroll
after the receipt of a connection enrollment confirmation message (CMSE).
• On an accepting device, if the connection has been accepted and no
connection enrollment confirmation message (CMSC) has been received
within T
enroll
after the acceptance.
To explicitly cancel a pending enrollment, call the IsiCancelEnrollment()
function.
When a connection host cancels a pending enrollment session, it issues a
connection enrollment cancellation message (CSMX). Devices that have accepted
the related connection invitation automatically cancel in result of receiving a
related CSMX message.
When a connection member cancels a pending enrollment session, the
cancellation only has local effect—the approved assembly changes to the
isiCancelled state. Since the connection host may continue re-sending invitation
messages (CSMOs), the same device may, once again, conditionally approve the
assembly and move it to the isiPending state. The user may now accept the
connection invitation once again (by causing the application to call