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command line util to encode/decode framed packets?
(lemmy.world)
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this post was submitted on 04 Aug 2024
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The command you're looking for is tape archiver, cunningly called
tar.Holy f… I thought you’re joking but yes tar is indeed a tape archiver
https://www.tecmint.com/tar-command-examples-linux/
That is what tar stands for. Interestingly enough, tar is based on an older util called ar, which was just a generic archive.
Interesting. Is that some new project?
No, but to learn bring computing to 2024 and to pad my github I'm currently working on a modern replacement written in React that can also use Electron on the desktop. It's pretty light at around 150mb. I don't have plans to natively port it to Linux, but it'll work in Windows Linux and MacOS with a little tweaking.
I do have plans to release the Docker image I've used for testing later this year along with a Snap and Flatpak so I guess it will natively work on Ubuntu.
Oh, and longterm goals are to have an Android and iPhone port. I have an ad provider set up so I can offer the mobile apps for free (gotta hustle) but I'll have a patreon and kofi set up by then for donations and a mostly ad-free version that aggregates usage info of your device and apps but doesn't give away any personally-identifiable details if you opt-out.
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I tried that first! But
tarcomplains if it can't find the file header! So I still need to do some sort of packets. Unless you know some sort of workaround?You're probably decoding noise or in the middle of the bit stream.
What you're looking for is called "preamble." That's a sequence of bits used to synchronize the decoder (marks the start of data, useful in modulation schemes for clock recovery, and a few other things).
Looking at minimodem's manual, try using the sync-byte option. Prepend your tar stream with a string of bytes, like 0x01, before sending to minimodem for encoding. Then use the sync code option to mark the start of the tar bit stream. This is as simple as cat preamble.bin myfiles.tar | minimodem --tx ....
Other things to consider: start small with 300 baud BFSK before speeding up. Test with wav files before attempting physical tape or speakers and a microphone.