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@@ -0,0 +1,38 @@ +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/ +or + 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. |