[vdr] Messages from Lirc have to be longer than 21 chars, why?

Hi,

during my tests with eventlircd I noticed that the up key of my remote didn't work with vdr, but with xbmc. I debugged vdr and stumbled above the line lirc.c:89 (not vanilla sources):

if (ready && ret > 21) {

Lirc sends this to vdr:

"67 0 KEY_UP devinput"

So this key gets ignored, all other key have longer names and are working. Solution seems to be easy. Instead of 21 I could use 19, but with inputlircd I get this string for the same key:

"67 0 KEY_UP event7"

It would get ignored again.

What is the intention for this condition:

ret > 21?

Is it to make sure to not get garbage from lirc? But why 21 chars? What would be a better length, or a better check?

Gerald