Receiving bytes works the same way, but you use SerReceive instead of SerSend. Sending and receiving at the same time is always impossible with IRDA because reflections can cause the Palm to see itself.

UInt16	serRefNum=0;
Err	err;

// Find serial library
	err = SysLibFind("Serial Library", &serRefNum); 
	if (err)
	{ 
		ErrDisplay("Open: Error on Ser:SysLibFind."); 
		serRefNum = 0;   
	} 

// Open serial port at 9600 baud
	err = SerOpen(serRefNum, 0, 9600L); 
	if (err)
	{ 
		if(err==serErrAlreadyOpen) 
		{ 
			ErrDisplay("SerOpen serErrAlreadyOpen"); 
		}
		else if (err==serErrBadParam)
		{ 
			ErrDisplay("SerOpen serErrBadParam"); 
		}
		else if (err==memErrNotEnoughSpace)
		{ 
			ErrDisplay("SerOpen memErrNotEnoughSpace"); 
		}
		else
		{ 
			ErrDisplay("Open: Error on SerOpen."); 
		} 
	} 

// Switch to IRDA mode	
	SerControl(serRefNum, serCtlIrDAEnable, 0L, 0L);


// Send raw IRDA bytes
	SerSend(serRefNum, "Test string...", 14, &err);


// Close the serial port before end of application
	SerClose(serRefNum);