Use Direwolf for Raw Packets not AX.25 Frames

[buddylindsey]

I am trying to write some software and I want to send raw data across RF (mostly experimentation) at this point.

However, I am lost in configuration. I would like to keep it simple and just write the output to a .wav file and then read from a .wav file while testing my code.

It seems like I would want to use KISS serial tnc, but I am a little lost in the configuration.

Is there a "simple" way to do non ax.25 data sending and receiving to a serial port for my app to connect to?

[ShawnStoddard]

Are trying to send raw audio? Can you provide some more details?

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On Tue, Oct 22, 2024, at 09:40, Buddy Lindsey, Jr. wrote: I am trying to write some software and I want to send raw data across RF (mostly experimentation) at this point. However, I am lost in configuration. I would like to keep it simple and just write the output to a `.wav` file and then read from a `.wav` file while testing my code. It seems like I would want to use KISS serial tnc, but I am a little lost in the configuration. Is there a "simple" way to do non ax.25 data sending and receiving to a serial port for my app to connect to? — Reply to this email directly, view it on GitHub <#552>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AARTX7KM5GLRBP5U2J5LJ5DZ4ZIV7AVCNFSM6AAAAABQMRHNV6VHI2DSMVQWIX3LMV43ASLTON2WKOZSGYYDKNBZGQ4TIOA>. You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[buddylindsey]

I want to see about messing with writing my own protocol as a learning exercise. Or re-implement ax.25 on my own, or at least part of it. I am trying to better understand lower-level packet radio. However, I feel overwhelmed on the actual generating audio and reading audio portion I was hoping I could use direwolf to handle modulation and demodulation of data.

What I would like to do is send data to direwolf via a serial port and it modulate it to a .wav file.

I then want to have direwolf read that .wav file demodulate it and push the data to a serial port for my app to read.

I don't want direwolf to do any transformations or try to read the data as ax.25 frames. I don't have a problem wrapping my data with the KISS protocol. Just don't want it to do anything beyond that.

Once i work out what I am trying to do in code I want to then try to send it to direwolf to have direwolf send it to my digirig for transmission in a real scenario.

[dranch]

Direwolf Github issues aren't the place to ask questions or get support. That's what the Direwolf group.io list at https://groups.io/g/direwolf is for. I recommend to create a thread there for getting a LOT more exposure to your question but you also might want to check out Kamal's minimodem - http://www.whence.com/minimodem/ as one idea. Please close this Github issue.

[buddylindsey]

Thanks, I missed the groups.io group. I'll go there and will also checkout minimodem.

[wb2osz]

direwolf is not just a TNC. It is a toolkit for experimentation. When used with the KISS interface, arbitrary HDLC frames can be sent and received. At least one person is using direwolf for non-AX.25 frames with his own protocol. direwolf will complain but do it. You can use the "-dh" command line option to dump all packets in hexadecimal. "gen_packets" will convert text to an audio file. "atest" will demodulate audio files and display the resulting text. These are used for modem & other automated testing without real-time audio.
You might find this documentation useful: https://github.com/wb2osz/aprsspec

73,
John WB2OSZ