SIM client

[Andreas.Eversberg]

hi,
 
i committed the SIM client process for layer23. it turns reading and
writing jobs (from and to SIM files) into APDUs. because the SIM reader
is not yet finished, it cannot be tested yet.
 
after attaching the SIM card, a process in mobile/subscriber.c will
request all required files form that card before starting the network
selection process. (untested, as noted above)
 
the mobility management is now cleaned up: TODO comments in the source
code are replaced by SIM update commands to the SIM client.
 
in order to make mobile application work with public networks, we need
to perform the following steps:
 
- finish the SIM reader and interface in layer 1
- add BTSAP interface to layer23
- add measurement reports to both TCH and SDCCH4/8 (*)
- send updates for measurement report from layer23 via l23 api of layer
1
- add crpyto-key request to layer 1 and l1-l2 interface (dieter ?)
 
* tests showed that the measurement report on SDCCH4/8 is requred. if
not sent, the network releases a call (cleanly) after the mobile stays
for a some seconds on an SDCCH4/8 (probably waiting for measurements,
before completing the call). sending some dummy measurements completed
the call successfully.
 

beside that, the following issues need to be solved soon, in order to
make the layer 1 firmware usable and stable:
 
- additional structures for the libosmocore, see
http://home.eversberg.eu/osmocore.patch
<http://home.eversberg.eu/osmocore.patch> 
- freeze of layer 1 after about 40-60 data messages, see
http://home.eversberg.eu/data.patch
<http://home.eversberg.eu/data.patch>  for testing. after a few location
updates firmware freezes. (the location update will fail, because the
patch disturbs location updating process, but the bug show up.)
- syncing problem
- clock drifts away after sync
- subchannels 4..8 of SDCCH/8
and maybe
- tch mode l1ctl message to select signalling only / speech codec of
TCH/F / TCH/H. (including bearer capability processing in layer23)
 

regards,
 
andreas

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