ACK doesn't need to wait 2 seconds for a reply, and when it does so the
next send waits too. Eventually we'll want to combine messages already
in the queue into a single send. For now, this makes things better.
So far uses curl and json-c to send b64-encoded data to new script
which is able to echo the data. Next that script will need to open a
UDP socket to the relay and return results that appear before timeout.