How to receive data on openhab using UDP ? (solved)

[shasha]

Hello !

Here is the problem I am facing :

I have an arduino node communicating using UDP. It sends on port 600 receives on port 500.
I would like to be able to send and receive data to this node from the openhab.

Sending data has been straight forward. It works nicely. On the other hand I did not manage to get
any data from this node. I tried various changes in the config file and in the way to do the incoming
binding but I still got warnings. Here are some information on my setup :

items setup :

String fromUDPnode "fromUDPnode" {udp="<[192.168.0.9:500:'REGEX((.*))']"}
String toUDPnode "toUDPnode" {udp=">[192.168.0.9:500:'REGEX((.*))']"}

config :

udp:itemsharedconnections=true
udp:bindingsharedconnections=true
udp:directionssharedconnections=false
udp:addressmask=true
udp:postamble=
udp:blocking=false
udp:refreshinterval=250
udp:port=600

and here are the warnings I get :

 [WARN ] [AbstractDatagramChannelBinding] - Received data 10;59;1;0;23;0
         from an undefined remote end /192.168.0.9:500. We will not process it
 [WARN ] [AbstractDatagramChannelBinding] - No channel is active or defined for the data we received from /192.168.0.9:500. It will be discarded.

seems openhab receives the data but discard them ...

any clue on how to solve this issue ?

Thanks

[Jasper van Zuijlen]

I had the same issue and found this post quite fast but although it says "(solved)" I found no solution. I am leaving my reply here for future reference.

What I did to fix the "It will be discarded" message:

[openhab.cfg]

This sets up the receiving end of the binding i.e. the server that binds the 5005 port.

udp:port=5005

[default.items]

This sets up the openhab binding to the string. Notice the asterisk after the IP address; because the client will connect to the server it will get assigned a random free port. The asterisk will catch all ports a client will get solving the "No channel is active or defined issue".

String 	String_FF_Bath_Test 	"Test String[%s]" 	 {udp="<[127.0.0.1:\*:'REGEX((.\*))']"}

[python]

Just some test code to easily send a UDP message to openhab.

import socket
UDP_IP = "127.0.0.1"
UDP_PORT = 5005
MESSAGE = "Hello world!"

print "UDP target IP:", UDP_IP
print "UDP target port:", UDP_PORT
print "message:", MESSAGE

sock = socket.socket(socket.AF_INET, # Internet
                 socket.SOCK_DGRAM) # UDP
sock.sendto(MESSAGE, (UDP_IP, UDP_PORT))