Re: reading rfm69 packet transmission

[Chris Gorman]

Hello again,

Just a small update in case someone wants to try this out.  I have two
patches to apply to get this working for me.  The first,
RFM69-Library-AVR-syncword.patch, is to apply against
fermitron2048/packetdemod and the second, RFM69.patch, is to apply
against nayem-cosmic/RFM69-Library-AVR.  My thanks to both
nayem-cosmic and fermitron2048 for their work writing these pieces of
software.

Take care.

Chris

On Thu, Feb 3, 2022 at 12:40 PM Chris Gorman <chrisjohgorman@gmail.com> wrote:
>
> 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

RFM69-Library-AVR-syncword.patch
Description: Text Data

RFM69.patch
Description: Text Data