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reading rfm69 packet transmission
From: |
Chris Gorman |
Subject: |
reading rfm69 packet transmission |
Date: |
Thu, 3 Feb 2022 12:40:50 -0500 |
Hello All,
I have two rfm69 boards [1] connected to two avrs and they are sending
messages to each other over the airway. Once I got this working I
thought it would be fun to inspect the messages being sent with my
rtl_sdr. I can confirm the message is being sent over serial on the
receiver.
I went searching on the internet for a way to decode the transmission
and found some scripts to use gnuradio to do packetdemod on rfm69
boards [2]. The problem with this setup is it requires me to modify
the code to the rfm69 [3] to prevent whitening. My software to run
the avrs isn't the same as the author of the packetdemod's and I can't
apply his patch. I have looked at the code to see if I am using
whitening, but as far as I can tell I am not. Regardless when I run
the packetdemod script, I get 'Invalid packets" instead of my message.
In my inbox this morning I found an email with a reference to packet
communications with gnuradio [4] and am wondering if I should be using
this method to decode the transmission between the two rfm69's? I
will try it out anyway as it seems interesting, but is this the
correct direction to analyze the transmission between two boards like
the rfm69s?
Thanks in advance,
Chris
[1] https://www.sparkfun.com/products/12775
[2] https://github.com/fermitron2048/packetdemod
[3] https://github.com/nayem-cosmic/RFM69-Library-AVR
[4] https://wiki.gnuradio.org/index.php?title=Packet_Communications
- reading rfm69 packet transmission,
Chris Gorman <=