Sending IR commands to the Dune player is fairly simple If you know how to implement http protocol and send an http GET over TCP. As an example here are the IR power commands as http Get commands:

Power On : GET /cgi-bin/do?cmd=ir_code&ir_code=A05FBF00
Power Off: GET /cgi-bin/do?cmd=ir_code&ir_code=A15EBF00
Power tgl: GET /cgi-bin/do?cmd=ir_code&ir_code=BC43BF00

If you compare this to the Dune published IR codes it should be obvious.

As a pure http command from a browser (for testing) the following will probably work (e.g Power tgl)
[Link: duneIPAddress]

Contact me at my email address (see my profile) if you need more help