support new msgpack schema & UDP transport

[itdaniher]

Derived from the same capnproto schema in this repository, information's serialized as a reading containing an array containing an array of u64s, a u64 representing datatype, a u64 UID, a f64 measurement, and a f64 timestamp.

Readings are broadcast to 127.0.0.1:9999 via UDP. The following is a basic demo.

import socket, msgpack

s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

s.bind(("127.0.0.1", 9999))

while True:
      x = msgpack.loads(s.recv(1024))
      print x
      print dict(zip(x, ["Lower", "DataType", "UID", "Measurement", "Timestamp"]))

[madisonmay]

Ok, so we're migrating from Unix Domain Socket --> UDP. Sounds good to me.

[itdaniher]

Yep! I'm pretty sure unix sockets are blocked by rust-lang/rust#12103 / rust-lang/rust#11201 - I had the code working fine using greenthreads, but using system threads I couldn't ever get the fifo object to actually be instantiated.