Tcp duplex

[reube]

Fixes #94
Hi @ProfHoekstra, @jooste.
We're quite keen to get involved in helping with developing bluesky.
(Our company is SPARKL www.sparkl.com).

Specifically, this pull request concerns the 'tcp duplex' issue.
See example on: ethertricity#4
Also, pls see comments on original pull request:
ethertricity#9

I have taken the liberty of adding some tests.
I will also invite you to the slack channel where the output from our CI server goes.
You can run the tests by executing make test or pytest -s bluesky/test with python-pytest installed.
There are 4 simple tests for the tcp interface currently.

The changes are mostly trivial. Modules such as BlueSky_qtgl.py have been chopped around a little to make it more easy to use for tests.

Pls feedback any questions, feedback, etc. Thanks - much appreciated
Andrew Farrell

Test run output:

Branch tcp_duplex set up to track remote branch tcp_duplex from origin.
============================= test session starts ==============================
platform linux2 -- Python 2.7.12, pytest-3.2.1, py-1.4.34, pluggy-0.4.0
rootdir: /home/vagrant/bluesky, inifile:
Reading config from settings.cfg
Creating directory "output"
Creating directory "data/cache/py2"
StateBasedCD: using default Python version, no compiled version for this platform.
StateBasedCD: using Python version.
Using BlueSky performance model
Loading global navigation database...
cachefile constructor
Cachefile not found: data/cache/py2/navdata.p
Reading nav.dat
Reading fix.dat
Reading awy.dat
cachefile constructor
Cachefile not found: data/cache/py2/aptsurface.p
Binary buffer file not found, or file out of date: Constructing vertex buffers from geo data.
Reading apt.dat from apt.zip
Writing cache: data/cache/py2/aptsurface.p
Writing cache: data/cache/py2/navdata.p
collected 4 items

bluesky/test/tcp/test_simple.py Loading palette bluesky-default
Using Qt 4.8.7 for windows and widgets
Initializing multi-process simulation
QGLWidget initialized for OpenGL version 3.3
cachefile constructor
Reading cache: data/cache/py2/aptsurface.p
Maximum supported texture size: 8192
Loading texture data/graphics/world.8192x4096.dds
cachefile constructor
Cachefile not found: data/cache/py2/coastlines.p
Reading coastlines.dat
Writing cache: data/cache/py2/coastlines.p
-- test_create_fail --: Data received: ['Syntax error: Too few arguments', 'CRE', 'CRE acid,type,lat,lon,hdg,alt,spd']
.-- test_create_success --: Data received: ['ok.']
.-- test_pos --: Data received: ['Info on KL204 B744 index = 0', 'Pos: N51\'59\'57.0"  E004\'00\'0.0"', 'Hdg: 180   Trk: 180', 'Alt: 2000 ft  V/S: 0 fpm', 'CAS/TAS/GS: 220/226/226 kts   M: 0.345', '', 'ok.']
.-- test_disconnect --: Data received: ['2']
-- test_disconnect --: Data received: ['2']
-- wait_for --: Data received: ['1']
.Reading config from settings.cfg
StateBasedCD: using default Python version, no compiled version for this platform.
StateBasedCD: using Python version.
Using BlueSky performance model
Loading global navigation database...
cachefile constructor
Reading cache: data/cache/py2/navdata.p
Successfully loaded DATAFEED
('Node', (0, 0), 'stopped.')
Stopping telnet server.
Stopping simulation processes...
Stopping nodes:
Done.
BlueSky normal end.


========================== 4 passed in 123.70 seconds ==========================