Hi everyone, I’m Simon, DJ2LS, and I'm working on my project „codec2 - FreeDATA“ since some month.
My goal is to create a multiplattform, open-source TNC, with an easy to use GUI. At the moment the project is Linux only and not usable yet. It's a prototype and I’m improving my programming skills „learning by doing“. So expect a lot of failures, problems, uncommon programming stuff. But at least I thought - Just do it! And here are the first results: ##### GUI The basic GUI is already working. Easy selection of audio devices and radio via Hamlib. Some status messages of the TNC are working as well. A huge part, which is still not working, is the waterfall diagram to have a look over the band / channel and its busy state. My plans are, to create a GUI with different modules: - Data transfer module - Chat module, with a modern, smartphone like design - Beacon module The entire GUI is a network application. So you can control and send data within your private network by default. The future idea is, sitting on the couch and chatting via HF... ##### TNC The TNC itself is written in Python and will be a CLI application. But you don’t have to fight with a lot of CLI commands - Just start the TNC and everything can be configured via network GUI. I’m also doing some basic TNC behavior a little bit different: - You don’t have to connect to another station to send data and keeping the channel opened ( and the channel busy as well ) This means, that if you want to send data to another station, you have to open a data channel ( automatically), which will be closed as soon as the data has been transmitted. ##### ARQ I already created support for different ARQ modes : - Stop-and-Wait - Go-Back-N - Selective Repeat You can also mix them together by selecting the amount of data frames per acknowledge burst and repeating lost frames. This is working in my development environment with some restrictions, but needs some more real tests with some kilometers between the stations. Somewhen in the future "path measurement" will automatically select the best constellation between frames per burst, amount of data and channel quality. You can find everything in my Github repository: https://github.com/DJ2LS/codec2-FreeDATA I don’t have that much time because of my job, so I’m doing everything step by step. Actually I’m working on the data module and a huge amount of documentation needs to be done as well. But everything looks promising. Have a good start into the week! Simon, DJ2LS
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