Re: [Discuss-gnuradio] edit packet content in benchmark

[Tom Rondeau]

On Mon, Jun 24, 2013 at 12:08 PM, yeran <address@hidden> wrote:
> Hi everyone,
>
> In benchmark, the packet is 23-byte long, inclues preamble, access code,
> header, payload, crc, and 'x55'. Now I want to add a one-byte flag after the
> header. I changed the packet_utils.py make_packet block, add a flag when
> form the new packet. And changed the header length to 9.  However, in
> terminal, when I run benchmark, it shows the new packet is 24-byte long now,
> including the flag byte. But in the file_sink after the byte2chunks and the
> chunks2symbols, the file is not longer than before. In these two files a
> packet is still 23 bytes without the new flag byte. So though in tx
> terminal, it looks like I've successfully changed the packet format, but
> actually, the transmitter didn't send this out, it still sends the original
> packet format.
>
> Has anyone come across this problem before, and could give me some kind
> suggestions on this? Thanks in advance!
>
> Ada

In the receiver, the deframing strips the header, so you're only
getting the payload out. You'll need to look at what the receiver code
is doing to read the header and return the packet length. You can
update that code to also include your flag from the header.

Tom