quad: don't block for client on virtual quad

Problem

The virt-quad requires the ground station to be run, due to the blocking while loop for accepting socket clients. Not every quad test will require the ground station.

Solution

Make the virt-quad more flexible by allowing it to connect to clients on the fly, enabling us to test/simulate other aspects of the quad that don't require the ground station.

Disclaimer

The git-diffs don't give Kris justice. Most of the code is still his, just with a tab adjustment because I haven't bothered to change my editor config. The only part that has actually changed is the accepting of clients (and then the addition of checking for clients in the write/read functions).

Review:

• @burneykb
• @dawehr

Lol, just ignore this. Needs to happen sometime, but is technically not a part of this merge request.

added 7 commits

• 8d377b1e...e6d15db7 - 5 commits from branch virt_quad
• 250e9bfe - Merge branch 'master' into virt_quad_noblock
• 00d2b59e - getting closer

Compare with previous version

Went with Unix FIFOs instead.

closed