Yes, you need to give time to the system for irda comms to work reliably.

You can code up a nested event loop - something like:
IrDiscoverReq(..);
Word timeout = TimGetTicks()+SysTicksPerSecond(); // one second timeout
for (;;) {
 EvtGetEvent(&event, SysTicksPerSecond());
 // In your irda callback you'd need to set a global if you connect, so you'll know it 
worked or not here
 // Also, you may get other events, which you'll need to decide to process or not
 if (TimGetTicks() > timeout) break;
}

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