New utility for drawing protocol ladder diagrams

[Harald Welte]

Hi!

With the help of graphviz, I have written a small perl-based tool that
allows you to generate ladder diagrams.  It can be found at
git://git.osmocom.org/gen_ladder.git

For your reference, I'm attaching a sample input and output file.

The bent/curved arrows are a result of graphviz trying to indicate
that the message is between e.g. MS and MSC and 'bypasses' BTS and BSC.
I'm still waiting for somebody with more graphviz skills to make this an
option.

Hope this is useful for some of you...

-- 
- Harald Welte <laforge at gnumonks.org>           http://laforge.gnumonks.org/
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[entities]
# define the entities in the system (in order)
ms
bts
bsc
# msc means MSC + VLR
msc
hlr

[messages]
# define the protocol messages in-order
ms	bts	"L1 RACH burst"
bts	bsc	"RSL CHAN RQD"
bsc	bts	"RSL CHAN ACT REQ"
bts	bsc	"RSL CHAN ACT ACK"
bsc	bts	"RSL IMM ASS CMD"
bts	ms	"IMMEDIATE ASSIGN"
ms	bsc	"MM LOC UPD REQ"
bsc	msc	"COMPL L3 INFO (LOC UPD REQ)"
msc	ms	"MM IDENTITY REQUEST"
ms	msc	"MM IDENTITY RESPONSE"
msc	hlr	"MAP SEND AUTH INFO req"
hlr	msc	"MAP SEND AUTH INFO resp"
msc	ms	"MM AUTH REQ"
ms	msc	"MM AUTH RESP"
msc	hlr	"MAP UPD LOC AREA req"
hlr	msc	"MAP INSERT SUBSCR DATA req"
msc	hlr	"MAP INSERT SUBSCR DATA resp"
hlr	msc	"MAP UPD LOC AREA resp"

ms	msc	"Dedicated Channel" both dashed
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