Interop Client: Recieve and store mission from AUVSI

[rland93]

On launch, the first thing we do is get a mission. So, we need to build the following functionality in interop:

• Get mission data as JSON from AUVSI server
• Start a service on the interop client (ideally, in its own thread).
• Unpack the JSON and store it into a single message Mission.msg. This message is kept in memory until:
• The interop client receives a request for a mission. At that point, it will pass the mission to the requestor.

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You can compose messages, so rather than passing in FlyZoneArrays, ObjectArrays, and so on, just pack them into a single message when the mission data is received.

[rland93]

Great work. I was able to compile it, on running it I get

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/urllib3/connection.py", line 159, in _new_conn
    conn = connection.create_connection(
  File "/usr/lib/python3/dist-packages/urllib3/util/connection.py", line 84, in create_connection
    raise err
  File "/usr/lib/python3/dist-packages/urllib3/util/connection.py", line 74, in create_connection
    sock.connect(sa)
ConnectionRefusedError: [Errno 111] Connection refused

I'm guessing because the interop server isn't running.

Can we document how the interop server gets installed/launched?

And then test the service with the interop server running to make sure the mission is being fetched?