I guess you want the irdadump utility (it\'s part of irda-utils)
NAME
irdadump -- monitors the IrDA traffic on one ore more links.
SYNOPSIS
irdadump [-i device] [-d] [-l] [-s n] [-x]
OPTIONS
-i device N.N.
-l set line buffering on output file.
-d prints the time difference between the current and the previous
frame.
-s n Set snaplen for -x.
-x dump frame.