UDP data

Hi all,

when I am trying to send a UDP message I can receive at the pc what I am sending from my NIOS II. But I am trying to send a string "test string" what I receive (and what shows in the console) is ":à.". My question is: when I send data do I need to give my data an offset?! I've got the LWIP manual here en it shows the headers. I've got room for a link header, an IP header and for the TCP header. Under these headers I've got space for the payload. So I think I need to give that offset, but I'm not sure. Help anyone?!

Thanks in advance...

Danny