Hi, There's a couple of errors in your code.
First, you mixed up the arguments of memcpy. It takes the destination address as the first parameter, and source as the. Right now you are just copying something random onto your header struct, and then send out this random byte array. Second, the use of strlen(message) in the send call is wrong. The message array is never zeroed, so it will report a random length. Using sizeof(struct ofp_header) or perhaps header.length would be more straightforward here. Regards, Zoltan From: openflow-discuss-boun...@lists.stanford.edu [mailto:openflow-discuss-boun...@lists.stanford.edu] On Behalf Of Eduard Gibert Renart Sent: Monday, January 27, 2014 7:39 PM To: Andrew Ferguson Cc: openflow-discuss@lists.stanford.edu Subject: Re: [openflow-discuss] Openflow packet Still doesn't work now the message doesn't even appear in the screen when I use wireshark, but if I change the size of the char buffer from 10 to 100 then I get Unknown Type 59 or 122 (15231B or 3261B) Ver Warning ! Any ideas ? Respectfully, Eduard Gibert Renart On ene 27, 2014, at 12:37 PM, Andrew Ferguson <a...@cs.brown.edu<mailto:a...@cs.brown.edu>> wrote: On Jan 27, 2014, at 12:33 PM, Eduard Gibert Renart <edugib...@gmail.com<mailto:edugib...@gmail.com>> wrote: Yes my architecture is little-endian. So I need to convert the length and the xid like this ? struct ofp_header header; header.version = OFP_VERSION; header.type = OFPT_HELLO; header.length = htons(8); header.xid = htonl(13); yes. I haven't tested your code, but the incorrect length could definitely be the problem (xid not so much). try it and see! if you are new to htons and htonl, I suggest this description: http://www.beej.us/guide/bgnet/output/html/multipage/ipstructsdata.html#byteorder from the excellent Beej's Guide to Network Programming, which I also recommend: http://www.beej.us/guide/bgnet/ Andrew
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