TCP binding Send and Update different message

Add-ons Bindings
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I’m using TCP binding to connect to a "personalized KNX interface (a socket wich implements a service that directly connects to KNX) developed by me. I’ve implemented my own protocol over TCP, something like:

<knx>CMD={cmd};GA={a/b/c};DLEN={data_len};[VAL={value}]</knx>

So, for example, for sending ON to a GroupAddress 0/0/1 of a light I would send:

<knx>CMD=WR;GA=0/0/1;DLEN=0;VAL=01</knx>

And if there’s a feedback GroupAddress 0/0/2 I would take back:

<knx>CMD=WR;GA=0/0/2;DLEN=0;VAL=01</knx>

I can control the lights correctly, but I can’t get the feedback because by using the .map files we can define just one value to ON and one to OFF.

My .items has:

Switch Light_map         "Light_map"         (Light)    {tcp=">[ON:10.0.0.224:1234:MAP(knxer.map)], OFF:10.0.0.224:1234:MAP(knxer.map)]"}

and my .map:

ON=<knx>CMD=WR;GA=0/0/1;DLEN=0;VAL=01</knx>
OFF=<knx>CMD=WR;GA=0/0/1;DLEN=0;VAL=00</knx>

and of course, when I get the feedback from my service openHab complains there’s no translation in the .map.

Is there a away to do it with MAP? For now I’m using scripts to solve it.