Hi Marcus
Thanks for the quick answer. I didn't know about nitems_written(0) but I did wonder why the system didn't already know. It's been a while since I used GDB but I will have a go. I don't quite understand - when you say "do make sure your string isn't going to be longer than your noutput_items" I don't know what that means because that's something coming from the scheduler isn't it? If so how can I know beforehand what that number is? I know a few hundred bytes that will be triggered by the one last input bit for the packet. I am afraid any of the tagged streams or messages are a bit of a mystery to me. Mike
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