add README
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I've been working on a small python tool that can be used to attach to
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the MNCC interface of OsmoNITB. It implements the 04.08 CC state
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machine with our MNCC primitives, including support for RTP bridge mode
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of the voice streams.
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The first working version of the tool is available from
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http://git.osmocom.org/mncc-python/
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or
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git clone git://git.osmocom.org/mncc-python
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The code is pretty hacky in some places. That's partially due to the
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fact that I'm much more familiar in the C, Perl and Erlang world than in
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python. Still I thought it's a good idea to do it in python to enable
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more people to use/edit/contribute to it.
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I'm happy for review / cleanup suggestion by people with more Python-foo
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than I have.
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Architecturally, I decided to do things a bit erlang-like, where we have
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finite state machines in an actor models, and message passing between
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the actors. This is what happens with the GsmCallFsm()'s, which are
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created by the GsmCallConnector() representing both legs of a call and
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the MnccActor() that wraps the MNCC socket towards OsmoNITB.
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The actual encoding/decodng of MNCC messages is auto-generated from the
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mncc header file #defines, enums and c-structures by means of ctypes
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code generation.
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The immediate first use case for this was to be able to generate MT
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calls to a set of known MSISDNs and load all 14 TCH/H channels of a
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single-TRX BTS. It will connect the MT calls in pairs, so you end up
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with 7 MS-to-MS calls.
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mncc_test.py currently drops you into a python shell where you can e.g.
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start more / new calls by calling functions like
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connect_call("7839", "3802")
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from that shell. Exiting the shell by quit() or Ctrl+C will terminate
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all call FSMs and terminate.
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