I have heard about ULTRA, but couldn't find the specs on the irda.org website. I will check this out as a second option after testing IrTestReq.
The actual ULTRA protocol doesn't seem to be available anymore. You can infer some of its structure from the IrWW spec (WW = wristwatch).
It's really not a very interesting protocol (IMHO), as it is limited to very low bauds ( < 9600) and packet payloads ( <= 62 bytes).
Serial API is a better option (albeit with some cross-device issues) to look into if IrTestReq doesn't work.
-Dave
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