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authorHarald Welte <laforge@gnumonks.org>2015-12-02 00:46:46 +0100
committerHarald Welte <laforge@gnumonks.org>2015-12-02 00:46:46 +0100
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parent47ff79107532a5e04470db23c3254dc998e1c39c (diff)
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+I've been working on a small python tool that can be used to attach to
+the MNCC interface of OsmoNITB. It implements the 04.08 CC state
+machine with our MNCC primitives, including support for RTP bridge mode
+of the voice streams.
+The first working version of the tool is available from
+ http://git.osmocom.org/mncc-python/
+ git clone git://git.osmocom.org/mncc-python
+The code is pretty hacky in some places. That's partially due to the
+fact that I'm much more familiar in the C, Perl and Erlang world than in
+python. Still I thought it's a good idea to do it in python to enable
+more people to use/edit/contribute to it.
+I'm happy for review / cleanup suggestion by people with more Python-foo
+than I have.
+Architecturally, I decided to do things a bit erlang-like, where we have
+finite state machines in an actor models, and message passing between
+the actors. This is what happens with the GsmCallFsm()'s, which are
+created by the GsmCallConnector() representing both legs of a call and
+the MnccActor() that wraps the MNCC socket towards OsmoNITB.
+The actual encoding/decodng of MNCC messages is auto-generated from the
+mncc header file #defines, enums and c-structures by means of ctypes
+code generation.
+The immediate first use case for this was to be able to generate MT
+calls to a set of known MSISDNs and load all 14 TCH/H channels of a
+single-TRX BTS. It will connect the MT calls in pairs, so you end up
+with 7 MS-to-MS calls.
+mncc_test.py currently drops you into a python shell where you can e.g.
+start more / new calls by calling functions like
+ connect_call("7839", "3802")
+from that shell. Exiting the shell by quit() or Ctrl+C will terminate
+all call FSMs and terminate.