TCP&UDP Binding - Could not transform/Could not parse

As an aside, you can make a map like

ON=S0100
OFF=C0100
S0800=ON
C0800=OFF
I000010115=ON
I000010015=OFF

You’ve not defined any input config “<” in your Items. Ordinarily, we might expect those to be “write only” and ignoure incoming UDP.
But I guess that udp.cfg
udp:updatewithresponse=true
overrides that (for all udp Items?)
(I realize something is required in udp.cfg to get anything working)

Problem with that theory is

Where did it get the idea to use the map file, without instruction? Confused.

Anyways, I think you may gain control of incoming data by specifying a “<” part in your udp= Item configs
This might help