DSP Support Forum: Message List - sendto retruns correct bytes but nothing goes out on the wire for BF537, receive is fine

Re: sendto returns correct bytes but nothing goes out on the wire for BF537, receive is fine

analog@sgaur.hosted.jivesoftware.com — Wed, 24 Jun 2009 17:34:10 GMT

In my example, the remote IP is set to 192.168.1.100 which is my PC address. You need to change it to your target to make the example work.

Re: sendto returns correct bytes but nothing goes out on the wire for BF537, receive is fine

analog@sgaur.hosted.jivesoftware.com — Wed, 24 Jun 2009 16:41:34 GMT

We have now confirmed it is a Windows issue, when monitored in Linux the packets are being sent properly.

Will update when we find and fix the problem.

Re: sendto returns correct bytes but nothing goes out on the wire for BF537, receive is fine

analog@sgaur.hosted.jivesoftware.com — Wed, 24 Jun 2009 16:31:02 GMT

I got a linksys wireless router so I could duplicat what your envirnment is for using 192.168.1.100; It did not work.

I am using the following:

ADSP-BF537 EZKIT LITE 2.2

Phytec PCM 975 with BF-537 daughter card

another

Phytec PCM 975 with BF-537 daughter card

custom hardware with BF-537 daughter card

All the results are the same, something is on the wire it is not recognised by with PC host () or Wireshark.

I am using Update 6 of the IDDE and yet I get a different size for the DXE than you do. There are lots of things that me do this and I don't beleive it is a problem as yet.

Maybe there is an uniinitialized register someplace, I am not aware of.

Tom

Re: sendto returns correct bytes but nothing goes out on the wire for BF537, receive is fine

analog@sgaur.hosted.jivesoftware.com — Tue, 23 Jun 2009 18:39:56 GMT

Change the remote ip to 192.168.36.51. Please also find attached an example I just made with your code. It worked well - sendto returns 100 and wireshark sees the packets correctly.

Re: sendto returns correct bytes but nothing goes out on the wire for BF537, receive is fine

analog@sgaur.hosted.jivesoftware.com — Tue, 23 Jun 2009 18:17:30 GMT

An Update:

TCP functions just fine for RX/TX, UDP receive works fine. I checked the wire and there is "something" comming out on the wire but it looks like garbage. I suspect the LWIP has got the incorrect address for the DMA to the NIC for UDP sendto only, but I am not able to verify. BTW, this same code functions perfectly in Window XP and Linux.

Tom

Re: sendto returns correct bytes but nothing goes out on the wire for BF537, receive is fine

analog@sgaur.hosted.jivesoftware.com — Tue, 23 Jun 2009 17:59:49 GMT

I tried the bind, bind worked and neither send or sento worked returing -1 with a 0 (zero) in the errno. The sento is supposed to do an implicit bind to the target anyway.

Tom

Re: sendto retruns correct bytes but nothing goes out on the wire for BF537, receive is fine

analog@sgaur.hosted.jivesoftware.com — Tue, 23 Jun 2009 17:48:26 GMT

In you code, I did not see bind() function call. Bind the socket to a port before transmitting data.

sendto retruns correct bytes but nothing goes out on the wire for BF537, receive is fine

analog@sgaur.hosted.jivesoftware.com — Tue, 23 Jun 2009 16:55:25 GMT

In the myThread.c attached I should see a UDP packet with data = 100 bytes on the wire. I have a cross over cable attached from the Target Board and My PC with a static address of 192.168.136.51

I am usign Wireshark to mintor the wire and setup a receiver in windows to chatch the packet, nothing ever shows up, to window, wireshark but the return byte count from the sendto is correct.

Any Ideas?