This is what I use for sending UDP:

function sendUDP(msg)
local socket = require "socket"
local udp = assert(socket.udp())
assert(udp:sendto(msg, "192.168.1.100", 9999))
assert(udp:close())
end



sendUDP("HELLO")

Spotted another setting "undec on". If I have this and ARC on, it responds to every event but varies between 3-7 codes:

ON DOOR CLOSE:
Packettype = UNDECODED RF Message
UNDECODED ARC:2779F21C072B

Packettype = UNDECODED RF Message
UNDECODED ARC:2779F21C0722

Packettype = UNDECODED RF Message ...

Interestingly, if I enable X10 at same time as Lighting4 I get this output, again, intermittently:

ON DOOR CLOSE:

Packettype = Security1
subtype = X10 security
Sequence nbr = 36
id1-3 = BCF900 decimal:12384512
status = Motion
battery level = Low
Signal level = 7 -64dBm

ON DOOR OPEN:

Packettype ...

Thanks ArieKanarie, that got them recognised but it detected 6 devices - 2 for each of the tamper, closed and open.

But it only works intermittently and not consistently between the 2 pairs. I tried it in RFXmngr (see below for example only tamper output) and same occurs, it is recognised but only ...

I have purchased the sensors below and can't get them to work with RFXCOM I've tried Lighting4 and ARC. It does say on the listing that the oscillator resistor can be 330K , any ideas where to put it ? Is it the empty space where it says R5 or maybe the 4 headers GTRV ? The chip markings is ...