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