You can bring up the Simplehomenet Utility Suite (free download), connect to EZSrve, select the EZSrve/EZBridge tab, and select the Control tab, which displays a Data Received window. The received two part X10 message will appear here as well as the single SndX10 message. At least that is what I am seeing on my system.
You will be looking at raw X10 data. The EZBridge/EZSrve Reference Manual (from download list) page 21 has an X10 Translation Table that will allow you to translate the raw data into meaningful X10 data.