Hi!

After quite a bit of hacking on libosmocore as well as the various parts of Osmocom-BB, I've now committed the latest state to the 'uplink' branch of osmocom-bb.git.

I have decided to introduce RSL/RLL as the interface between Layer2(LAPDm) and Layer3(04.08), as it is a clean protocol that we already understand from the OpenBSC side.

You can see in src/host/layer2/src/osmocom_rslms.c how we receive e.g. the 04.08 PAGING REQUEST and 04.08 IMMEDIATE ASSIGNMENT on the PCH/AGCH inside RSL UNIT DATA INDICATION messages.

Please note the layer2/src/lapdm.c implementation is extremely incomplete, particularly when it comes to ABM (asynchronous balanced mode) and I-frames. It's full of FIXME's that I'll be working on as soon as possible.

However, the infrastructure now seems to be coming together and we basically have everything in place for bi-directional transmission of data for SAPI0 and SAPI3 for both DCCH and ACCH (limited to SDCCH/4 on combined CCCH on C0T0)

Regards, Harald