Help with callback in scripts

I've written a script to mirror a xap rf command on my livebox to a port on my raspi.

require "xap"
require "xap.bsc"
require("socket");
local switchoff="01427111937";
local switchon ="11427111937";
local myIP="172.16.1.164";
local myPort = 3000;
local sendTx

function init()
client=socket.tcp()
client:settimeout(0.5)
res, err = client:connect(myIP, myPort)
if not res and not res=="timeout" then
print("Error in connect: "..err)
os.exit()
end
print("success")
client:send("u", i, j)
f = xap.Filter()
f:add("xap-header", "source", "dbzoo.livebox.controller:rf.2")
f:add("xap-header","class","xAPBSC.event")
f:callback(switchplug)
end


function getdata()
local s, status, partial = client:receive('*l') --try to read all data
if status ~= "timeout" then
print(s)
end
end




function switchplug(frame)
sendTx = frame:getValue("output.state","state")
print(sendTx)
if sendTx == "on" then
client:send(switchon, i, j)
print(switchon)
else
client:send(switchoff, i, j)
print(switchoff)
end
end


xap.init("dbzoo.lua.tcptest","FF005A00" )
init()
xap.Timer(getdata, 6):start()
xap.process()

The script seems to work fine on the livebox but I expected to be able to run it on the Pi and have it respond to the xap function callback. Which of the xap programs needs to be running on the Pi to make this work?