How to enable UDP callbacks in Windows 7

Hello.  I send datagrams UDP to a controller that is shipped to a PC.  The PC is Windows 7 Home premium, 64 bit, Core i3, Broadcom NIC and works CVI2012.  I use the UDPReader code example that comes with the samples provided with CVI.  I have tried everything and can't get the UDPCallback to run.  The on-board controller creates the socket successfully.  I can see the packets transmitted by the sender.  I can use the control panel to show the connection to the Local network and I see the number of bytes received increasing with each shipment.  However, the UDPCallback is not called.  I tried the following:

(1) address: I thought I might have a problem with an incorrect IP address or Port numbers.  I tried many combinations and also tried USE_ANY_LOCAL_PORT and USE_ANY_ADDRESS, which (as I understand it) implemented the code to receive a UDP packet from anywhere.

(2) I tried to change the configuration of the NIC (Broadcom Etherenet card on the main map) because I see a lot of NIC devices can process control totals and change the way that they interrupt the processor.  I tried to disable all these features NIC.  No change.

(3) I tried to use the multicast and broadcast.

(4) I tried different length packets.

(5) I put breakpoints in the recall, but they are not achieved.

I do not have a network Analyzer, so I can't easily verify the content of the datagram arriving on the PC.

I wonder if:

(1) my datagram is not well-formed and is rejected. (Should be OK because the embedded controller has a UDP driver who obvously must conform to the Protocol.)

2) there is a problem due to having a multi PC processor

3) code is required to enable the Win 7 report to the CVI system that a packet was received.  The UDPCallback is triggered by the UDP_DATAREADY event and this seems to be related to an FD_READ event but I couldn't find more information about it.

I CAN successfully Ping the controller from the PC, so there is no underlying problem with LAN.

Any ideas greatly appreciated.   Stuart.

Hi Stuart,

You have disabled your firewall. The reports that I can find on problems to receive information via a UDP connection is mainly explained by the firewall is enabled on a machine. This includes Windows and third-party firewalls.

Kind regards

Tags: NI Software

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