Software to use WiFi cards to transmit peer to peer data. Updated HFDP.
High Flyers Data Protocol is a software inspired by WifiBroadcast. Using Pcap library and of-the-shelf wifi modules (like this) we send any udp data peer-to-peer. This software was developed on ubuntu and rasbian, requiers just pcaplib-dev and pthread!
HFDP include many options usefull for autonomous vehicles:
- Can send data from any local UDP client/server (like telemetry or video)
- Two modules doesn't need to have bidirectional communication
- Each packet can be pass via man-in-the-middle (you can have two planes and one can act as a retransmitter)
- Any wifi module that supports packet injection and monitor mode can be used
Many mistakes were made during draft of the first version. After some thought I have came to conclusion, that updating code would take more time than rewriting. Now with little more skill I will try to make it better 🙃. Besides I want a cpp project to make myself better 😎.
With C++ smart pointers, thread managment and class architecture things should be easier. Previously I wanted to keep the project in C because PCAP library is in C but I think more gain will be with using C++.
Not using buffers was a huge mistake in HFDPv1. Packets were blocking arrival on another when waiting for transmitting or recieving sockets.
FEC (forward error correction) should give benefit of capability of repairing broken recived packets based on fec data. To use it, protocol should be rewritten.
Random .txt files for keeping MAC adresses, and configurations sucks. Even more sucks to write dump function to read this data. That is why I want to keep everything in nice JSON file for easy readability and implementation.
Everyone likes threads (especially when u have to pass data between them), that is why I want to add more of them, so CPU load will be better distributed 🔥🔥🔥.
PCAP library offers low-level packets filtering which can decrease CPU load. Some of this functionality was in one of the branches of HFDPv1.