Cmd structure for rtl_tcp

Hi List! I'm new here, so I hope I'm asking for help in the right place. I'm trying to build and application that read I/Q data from rtl_tcp using Delphi. For beginning, I'm trying to set some params for rtl_tcp using my remote app. I found the source code of rtl_tcp and I could identify some information about what is each command, like 0x01 (hex) is to set frequency, 0x02 to set sample, etc.... What I don't undertand is the structure of parameters. Each parameter is one byte? If not, how parameters are sent? Do I need to send char to end command, like end of line or carrier return? Is not, what's the correct structure for sending commands? For example: For setting gain, send one byte with 0x04 and another byte indicating the gain index. Tks! Jonis Maurin Ceará