The following code enables you to open a telnet connection and send commands. I use it to connect to my Pioneer sound system. Add it to a user script.
function telnet(host, port, command)
local socket = require("socket")
local tcp = assert(socket.tcp())
res, err = tcp:connect(host, port)
res, err = tcp:send(command)
while true do
local s, status, threebytes = tcp:receive(3)
if status == "closed" then break end
All you need to do now is call the function from your KNX-Object script. Example:
telnet('192.168.0.24', 8102, 'PF\r\n\r\nclose\r\n\r\n')
The PF command tells my Pioneer to turn off. I’m not sure if a close command is necessary, but all the returns are. The IP address and port have to be changed to what you need.