Hey Bob,
there is plenty of documentation on this topic you can check out under
[1,2].
Especially, the Header Payload Demuxer (HPD) [3] should be worth a look
if you are dealing with packetized variable length data.
Hope those pointer can get you started. If you have further questions
after going through those pages, let me know.
Cheers,
Julian
[1] https://www.gnuradio.org/doc/doxygen/page_packet_data.html
[2] https://www.gnuradio.org/doc/doxygen/page_packet_comms.html
[3]
https://www.gnuradio.org/doc/doxygen/classgr_1_1digital_1_1header__payload__demux.html
On 31.12.18 01:00, Alban Meffre wrote:
Hi
I would like to decode a simple GFSK packet
here is the packet structure :
preamble : AAh x 4
sync word : D391h
length byte : 1 byte
payload : 1 to 64 bytes
CRC : 2 bytes
TX : arduino + CC1101 module, 2GFSK, 100kbps, excursion 50kHz, carrier
433 MHz
RX : RTLSDR
until now i was able to demodulate the signal and add a "sync" tag using
the correlate access code.
my goal is to extract the payload and send it to a file or a socket.
is there a simple way to do that without writing my own block ?
i can't go further, because i do not manage to find the info i need
i do not know where to start : stream, tagged stream, PDU, messages, etc..
i do not figure out how to use these tag for variable length. nothing
clear in the doc
i'd be glad if someone helps me
best regards
bob
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