Why does the Protocol Formatter block add additional 4 bytes of data to the Header?
For example, take the following case (Here is a snapshot of GRC and the .grc file is attached with the email . )
This .grc file (taken from the examples of /src/share/gnuradio/examples/digital/packet/) has two Fromat Obj.'s defined . One of them is "digital.packet_utils.default_access_code"
and Second one is the similar thing with additional counter (which appends 4 bytes of running counter data to the header)
When I execute the "digital.packet_utils.default_access_code" in python, it gives me 8 bytes of data. (ac dd a4 e2 f2 8c 20 fc )
but the output of Protocol Formatter is the following 12 bytes of data in which last 4 bytes of 12 bytes are appended with (00 11 00 11)
can anyone of you please point out me the reason why it is appending those 4 bytes of data?
Thanks for your time and help.