Req: GET /rd-lookup/res?et=core.rd-group

Res: 2.05 Content
Payload:
<coap://[ff35:30:2001:db8:f1::8000:1]/light>;
     rt="tag:example.com,2020:light";
     if="tag:example.net,2020:actuator",
<coap://[ff35:30:2001:db8:f1::8000:1]/color-temperature>;
     if="tag:example.net,2020:parameter";u=K,