Hello all.

I'm trying to use the Ethernet.lib library with a 750-842 controller. I want to make an UDP server listenning to UDP packet wich are broadcasted on the network.

I'm doing this:

VAR
socket: ETHERNET_SERVER_OPEN;
Read: ETHERNET_READ;
END_VAR
IF (socket.SOCKET = 0) THEN
    socket(EN:=1, TYP:=SOCK_DGRAM, PROTO:=IPPROTO_UDP, PORT:=4545);
END_IF
Read(EN:=1, SOCKET:=socket.SOCKET, DATA:=buffer);
Read(EN:=0, DATA:=buffer);
IF (Read.LEN_OUT > 0) THEN
    (* Do somthing *)
END_IF

The socket is successfully created with no error, but when a packet comes nothing is read from the ETHERNET_READ function block...

Why? Does anybody know if I've done something wrong?

Thank

Raoul

Hi

Did you try it like this:

Read(EN:=1, SOCKET:=socket.SOCKET, DATA:=buffer);

IF (Read.LEN_OUT > 0) THEN

Read(EN:=0, DATA:=buffer);

(* Do somthing *)

END_IF

Yes I tried that, but It's exactly the same...

Raoul

Hi

I have a (fully working and tested) Sample for you.

Maybe it helps you to understand the mechanism.

Greets

Erik

WagoEthernetServer.zip [12.42 KiB] (forum.codesys.com)

Thank you, I'll try this example...

Raoul