Initial set of topics for Open5gs feedback talk

.gitignore

@@ -1,3 +1,6 @@
+.vscode/
+
+*.pdf
+
 # libreoffice:
 \.~lock\.*#
-*.pdf

2024/osmodevcon2024/open5gs_feedback/.gitignore

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+slides*.png
+slides*.txt
+slides.html

2024/osmodevcon2024/open5gs_feedback/Makefile

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+html: slides.html
+
+slides.html: slides.adoc
+	asciidoc slides.adoc
+
+.PHONY: html
+
+clean:
+	rm -f slides*.png slides*.txt slides.html

2024/osmodevcon2024/open5gs_feedback/slides.adoc

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+open5gs - feedback from user point of view
+==========================================
+:author:	Alexander Couzens <acouzens@sysmocom.de>, Oliver Smith <osmith@sysmocom.de>, Pau Espin Pedrol <pespin@sysmocom.de>
+:copyright:	2024 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de> (License: CC-BY-SA)
+:backend:	slidy
+:max-width:	45em
+
+== open5gs - feedback from user point of view
+
+* Source file structure:
+** (*-build.c, *-path.c, *-handler.c, *-context.c, *-sm.c)
+
+== open5gs - feedback from user point of view
+
+* Enc/dec code generated automatically from .docx spec files using python scripts
+
+== open5gs - feedback from user point of view
+
+* Split git repository vs unique git repository
+
+== open5gs - feedback from user point of view
+
+* Commits:
+** Meaningful commit messages
+** Logical change per commit
+
+== open5gs - feedback from user point of view
+
+* `assert()`
+
+== open5gs - feedback from user point of view
+
+* Config file syntax backward compatibility
+
+== open5gs - feedback from user point of view
+
+* mongodb backend:
+** DB requirements?
+** Alternatives?

2024/osmodevcon2024/osmo_epdg/.gitignore

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+slides*.png
+slides*.txt
+slides.html

2024/osmodevcon2024/osmo_epdg/Makefile

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+html: slides.html
+
+slides.html: slides.adoc
+	asciidoc slides.adoc
+
+.PHONY: html
+
+clean:
+	rm -f slides*.png slides*.txt slides.html

2024/osmodevcon2024/osmo_epdg/slides.adoc

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+osmo-epdg: The osmocom ePDG for VoWiFi
+======================================
+:author:	Pau Espin Pedrol <pespin@sysmocom.de>
+:copyright:	2024 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de> (License: CC-BY-SA)
+:backend:	slidy
+:max-width:	45em
+
+== One Slide
+
+* hello
+
+== Second slide
+
+* bye
+
+== Know more
+
+* IRC: #osmocom @ freenode
+* link:https://osmocom.org/projects/cellular-infrastructure/wiki/Mailing_Lists[Osmocom Mailing lists]
+* link:https://osmocom.org/projects/cellular-infrastructure/wiki/Videos_of_Presentations[Osmocom Recorded Presentations, Talks]
+* Contributing patches via link:https://osmocom.org/projects/cellular-infrastructure/wiki/Gerrit[Osmocom Gerrit]

2024/osmodevcon2024/osmo_pcu/.gitignore

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+slides*.png
+slides*.txt
+slides.html

2024/osmodevcon2024/osmo_pcu/Makefile

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+html: slides.html
+
+slides.html: *.adoc
+	asciidoc slides.adoc
+
+.PHONY: html
+
+clean:
+	rm -f slides*.png slides*.txt slides.html

2024/osmodevcon2024/osmo_pcu/data_model_graphviz.adoc

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+[graphviz]
+----
+digraph hierarchy {
+node[shape=record,style=filled,fillcolor=gray95]
+edge[dir=back, arrowtail=empty]
+
+PCU[label = "{gprs_pcu|+ pcu_sock_state\l+ bssgp\l+ bts_list[]\l}"]
+BTS[label = "{gprs_rlcmac_bts|+ gsm_sysinfo\l+ trx_list[]\l+ ms_list[]\l}"]
+TRX[label = "{gprs_rlcmac_bts_trx|+ul_tbfs[]\l+dl_tbfs[]\l}"]
+PDCH[label = "{gprs_rlcmac_pdch|+ is_enabled\l+ pdch_ulc\l+ assigned_usf_mask\l+ assigned_tfi_mask_(dl,ul)\l+ tbfs_dl[]\l+ tbfs_ul[]\l+ pagings[]\l}"]
+ULC[label = "{pdch_ulc|+ registered_polls[]\l}"]
+ULC_NODE[label = "{pdch_ulc_node|+ fn\l+ type\l}"]
+ULC_NODE_TBF_USF[label = "{pdch_ulc_node_tbf_usf|+ ul_tbf\l}"]
+ULC_NODE_TBF_POLL[label = "{pdch_ulc_node_tbf_poll|+ poll_tbf (UL/DL)\l+ reason\l}"]
+ULC_NODE_SBA[label = "{pdch_ulc_node_sba|+ sba\l}"]
+MS[label = "{GprsMs|+ imsi, tlli, ta...\l+ refcount\l+ current_trx\l+ first_common_ts\l+ llc_queue\l}"]
+TBF[label = "{gprs_rlcmac_tbf|+ tfi\l+ egprs_enabled\l+ control_ts\l+ pdch[]\l+ ul_ass_fsm\l+ dl_ass_fsm\l+ window\l+ llc_frame\l+ rlc_blocks\l}"]
+UL_TBF[label = "{gprs_rlcmac_ul_tbf|+ state_fsm\l+ ul_ack_fsm\l+ usf[]\l}"]
+DL_TBF[label = "{gprs_rlcmac_dl_tbf|+ state_fsm\l}"]
+SBA[label = "{gprs_rlcmac_sba|+ pdch\l+ fn\l+ ta\l}"]
+RLC_WINDOW[label = "{gprs_rlcmac_window|+ sns\l+ ws\l}"]
+RLC_WINDOW_UL[label = "{gprs_rlcmac_window_ul|+ v_r\l+ v_q\l+ v_n[]\l}"]
+RLC_WINDOW_DL[label = "{gprs_rlcmac_window_dl|+ v_s\l+ v_a\l+ v_b[]\l}"]
+LLC_QUEUE[label = "{gprs_llc_queue|+ prio_queues[]\l}"]
+LLC_PRIO_QUEUE[label = "{gprs_llc_prio_queue|+ codel_state\l+ priority\l+ frames[]\l}"]
+LLC_FRAME[label = "{gprs_llc_frame|+ payload[]\l+ priority\l}"]
+RLC_BLOCK[label = "{gprs_rlcmac_rlc_block|...}"]
+
+PCU -> BTS [headlabel="*", taillabel="1"]
+BTS -> TRX [headlabel="0..8", taillabel="1"]
+BTS -> MS [headlabel="*", taillabel="1"]
+TRX -> PDCH [headlabel="0..8", taillabel="1"]
+
+PDCH -> ULC [headlabel="1", taillabel="0..1"]
+ULC -> ULC_NODE [headlabel="*", taillabel="1"]
+ULC_NODE -> ULC_NODE_TBF_USF [arrowtail=odiamond]
+ULC_NODE -> ULC_NODE_TBF_POLL [arrowtail=odiamond]
+ULC_NODE -> ULC_NODE_SBA [arrowtail=odiamond]
+ULC_NODE_SBA -> SBA[headlabel="1", taillabel="1"]
+
+TBF -> UL_TBF [arrowtail=odiamond]
+TBF -> DL_TBF [arrowtail=odiamond]
+
+RLC_WINDOW -> RLC_WINDOW_UL [arrowtail=odiamond]
+RLC_WINDOW -> RLC_WINDOW_DL [arrowtail=odiamond]
+
+MS -> TBF [headlabel="*", taillabel="1"]
+
+MS -> LLC_QUEUE [headlabel="1", taillabel="1"]
+LLC_QUEUE -> LLC_PRIO_QUEUE [headlabel="*", taillabel="1"]
+LLC_PRIO_QUEUE -> LLC_FRAME [headlabel="*", taillabel="1"]
+
+TBF -> RLC_WINDOW [headlabel="*", taillabel="1"]
+TBF -> LLC_FRAME [headlabel="0..1", taillabel="1"]
+TBF -> RLC_BLOCK [headlabel="*", taillabel="1"]
+
+TRX -> MS [headlabel="*", taillabel="1", style=dashed, arrowtail=none, label="assigned"]
+TBF -> PDCH [headlabel="0..8", taillabel="1", style=dashed, arrowtail=none, label="assigned"]
+
+UL_TBF -> ULC_NODE_TBF_USF [style=dashed, arrowtail=none, label="registered"]
+TBF -> ULC_NODE_TBF_POLL [style=dashed, arrowtail=none, label="registered"]
+
+TRX -> UL_TBF [headlabel="*", taillabel="1", style=dashed, label="assigned"]
+TRX -> DL_TBF [headlabel="*", taillabel="1", style=dashed, label="assigned"]
+}
+----

2024/osmodevcon2024/osmo_pcu/pcu_loc_bsc_graphviz.adoc

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+[graphviz]
+----
+digraph G {
+    rankdir = LR;
+    BTS -> OsmoBSC [label="Abis/IP"];
+    BTS -> OsmoPCU [label="GPRS/TRAU"];
+    OsmoBSC -> OsmoMSC [label="3GPP AoIP"];
+    OsmoBSC -> OsmoPCU [label="pcu_sock"];
+    OsmoPCU -> OsmoSGSN [label="Gb/IP"];
+    OsmoMSC -> OsmoHLR [label="GSUP"];
+    OsmoSGSN -> OsmoHLR [label="GSUP"];
+    OsmoSGSN -> OsmoGGSN [label="Gp"];
+    OsmoGGSN -> Internet [label="Gi"];
+    OsmoPCU [color=red];
+    { rank=same OsmoBSC OsmoPCU }
+}
+----

2024/osmodevcon2024/osmo_pcu/pcu_loc_bts_graphviz.adoc

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+[graphviz]
+----
+digraph G {
+    rankdir = LR;
+    OsmoBTS -> OsmoBSC [label="Abis/IP"];
+    OsmoBSC -> OsmoMSC [label="3GPP AoIP"];
+    OsmoBTS -> OsmoPCU [label="pcu_sock"];
+    OsmoPCU -> OsmoSGSN [label="Gb/IP"];
+    OsmoMSC -> OsmoHLR [label="GSUP"];
+    OsmoSGSN -> OsmoHLR [label="GSUP"];
+    OsmoSGSN -> OsmoGGSN [label="Gp"];
+    OsmoGGSN -> Internet [label="Gi"];
+    OsmoPCU [color=red];
+    { rank=same OsmoBTS OsmoPCU }
+    { rank=same OsmoMSC OsmoSGSN }
+}
+----

2024/osmodevcon2024/osmo_pcu/slides.adoc

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+OsmoPCU: past, present and future
+=================================
+:author:	Pau Espin Pedrol <pespin@sysmocom.de>
+:copyright:	2024 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de> (License: CC-BY-SA)
+:backend:	slidy
+:max-width:	54em
+
+== PCU: GPRS Packet Control Unit
+
+* Forwards LLC data frames between MS and SGSN:
+** SNDCP (link:https://www.etsi.org/deliver/etsi_ts/144000_144099/144065/06.06.00_60/ts_144065v060600p.pdf[3GPP TS 44.065]): user plane (IP/UDP/TCP/...)
+** GMM (link:https://www.etsi.org/deliver/etsi_ts/124000_124099/124008/16.07.00_60/ts_124008v160700p.pdf[3GPP TS 24.008]): control plane
+
+* Towards the MS (Um): RLC/MAC (link:https://www.etsi.org/deliver/etsi_ts/144000_144099/144060/16.00.00_60/ts_144060v160000p.pdf[3GPP TS 44.060])
+* Towards the SGSN (Gb): BSSGP (link:https://www.etsi.org/deliver/etsi_ts/144000_144099/144064/16.00.00_60/ts_144064v160000p.pdf[3GPP TS 44.064]), NS (link:https://www.etsi.org/deliver/etsi_ts/148000_148099/148016/16.00.00_60/ts_148016v160000p.pdf[3GPP TS 48.016])
+* Towards the BTS/BSC: Not specified, Osmocom link:https://gitea.osmocom.org/cellular-infrastructure/osmo-pcu/src/branch/master/include/osmocom/pcu/pcuif_proto.h[PCU_IF]
+
+image::gprs_stack.jpg[width="100%"]
+
+== PCU: Location
+
+.Co-located with BTS:
+** OsmoBTS (with/without `direct_phy`)
+
+include::pcu_loc_bts_graphviz.adoc[]
+
+.Co-located with BSC:
+** Ericsson RBS
+
+include::pcu_loc_bsc_graphviz.adoc[]
+
+== Past:
+
+[role="incremental"]
+* It's 2017..2019 AD
+* PCU, the Ugly Ducking => no looking at it, no touching it
+* Heap of debris, people keep adding stuff on to it _(dramatic exaggeration)_
+* Not much architecture/API documentation
+* Code lacking spec references backing logic
+* C++ (problems with talloc, osmo_*, `llist` ASan false positives, ...)
+* Code really entangled:
+[role="incremental"]
+** Lots of spaghetti code
+** Object lifecycle not clear
+** No separation between `bts` and `pcu` object
+** `tbf`/`dl_tbf`/`ul_tbf` classes in same file
+** `tbf`/`GprsMs` object relation mess,`tbf` didn't have an MS object assigned sometimes
+** `alloc_algo` resource allocation not logically separated from `tbf` allocation, directly modifying them
+* Code lacking use of osmocom infra:
+** No FSMs
+** Lots of timers not using osmo_tdef
+* Existing logging not that useful / difficult to follow
+* Really difficult to figure out when certain events or code paths triggered (eg. DL vs UL TBF).
+
+* Functional architectural problems:
+** GPRS vs EGPRS mode, exclusive
+** No differentiation between CS/MCS L1 capabilities and GPRS/EGPRS (eg using EGPRS with only MCS1..MCS4)
+** Not receiving all TDMA blocks (DATA.ind): no fullTDMA clock. Procedures based on wall clock timers.
+[role="incremental"]
+*** Impossible for PCU scheduler to track T31XY, lost packets, etc.
+*** Stuff based on wall clock timers.
+
+== Past: Tests
+
+* No TTCN-3 tests
+* Only unit tests:
+** Long and difficult to follow/debug
+** Using osmo-pcu objects/code in an artifical way, sometimes wrong
+** Lots of code in osmo-pcu only used by unit tests => death code
+
+* Modifying code = high risk of breaking stuff, regressions
+
+== Motto 1:
+
+image::one_does_not_simply_change_pcu.jpg[width="100%"]
+
+* Consequence: New bugs and regressions are coming (TM)
+
+== Motto 2:
+
+image::one_does_not_simply_fix_bug_pcu.jpg[width="100%"]
+
+* Consequence: lots of refactoring commits required usually prior to fixing a bug without breaking more stuff
+
+== Chronology (1)
+
+// Refactoring rounds done in iterations: Submit bunch of commits, let them settle and see if regressions show up, next round.
+// Refactoring rounds or interesting events, in chronological order:
+
+.The Dark Age:
+
+[role="incremental"]
+* _2017_: Attempts at splitting spaghetti code (Max, no ttcn3, regressions sometimes)
+* _2017-08-09_: I start coding on osmo-pcu (owning 749/1333 commits since then)
+* _2018-03-08_: TTCN3 PCU_Tests added (mostly only NS tests from Harald)
+
+== Chronology (2)
+
+.Refactoring, refactoring, refactoring...
+
+[role="incremental"]
+* _2019-09-*_: TTCN3 PCU_Tests testing RLC/MAC (w/ Vadim)
+* _2019-09-*_: Move several timers to osmo_tdef; tdef subclass moved to own files
+* _2019-12-*_: Support PAGING-CS/PS from SGSN
+* _2020-0{1,2,3}-*_: Lots of CSN.1 enc/dec improvements on MS RA Capability (w/ Vadim)
+* _2020-05-*_: GprsMs object now allocated before tbf object; C++--
+* _2020-06-*_: 11bit RACH support for EGPRS (Vadim)
+* _2020-07-*_: PCUIFv10: IPv6 NSVC support, NS2 lib (lynxis)
+* _2020-10-*_: More `tbf`/`dl_tbf`/`ul_tbf` untangling, Allocator fixes
+* _2020-11-*_: GPRS + EGPRS multiplex support
+* _2020-12-16_: Convert lots of C++ classes to C
+* _2021-01-*_: Split `pcu` and `bts` objects, C++--
+* _2021-01-*_: NACC/RIM support. Frist FSM! `nacc_fsm`
+* _2021-02-22_: Multi-slot UL TBF support
+* _2021-03-*_: PCUIF: Rx DATA.ind len=0, track TDMA clock on block basis
+* _2021-0{3,4}-*_: Introduce PDCH UL Controller (`pdch_ulc`): sb, RRBP polls (other than N+13), sba, etc.
+* _2021-05-14_: Initial FSM `tbf_state`! (logic *slowly* moved inside)
+* _2021-07-27_: FSMS `tbf_ul_ass_state`, `tbf_dl_ass_state`
+* _2021-09-20_: Skip Tx idle blocks over PCUIF: BTS BCCH Tx power reduction
+* _2021-11-15_: Release 1.0.0, tons of stuff was moved to FSMs
+
+== Chronology (3)
+
+.Not done refactoring yet:
+
+[role="incremental"]
+* _2022-03-31_: LLC schedule with SAPI priority. LLC code C++--
+* _2022-10-27_: Refactor GprsMs code assigning TBFs (new APIs). Improved logging.
+* _2022-11-17_: Split tbf_fsm as tbf_{ul,dl}_fsm!
+* _2023-0{2,3,4}-*_: Ericsson RBS support (Philipp)
+* _2023-04-*_: gprs_rlcmac.cpp C++-- (Max)
+* _2023-04-*_: Rewrite GprsMs lifecycle (refcounts, etc.), GprsMsStorage merged into BTS.
+* _2023-04-*_: Split tbf allocation from resource allocation (`alloc_algo` becomes idempotent).
+* _2023-06-*_: Start fixing issues spotted during osmocom-bb gprs implementation
+* _2023-08-*_: PCUIFv11: DATA.cnf s/tlli/msg_id/, new paging SAPIs
+* _2023-08-22_: Allow modifying default msclass
+* _2023-10-05_: PCUIFv12: Signal BTS model in INFO.ind
+* _2024-03-25_: More `tbf`/`GprsMs` lifecycle fixes
+
+== Present
+
+.Great:
+[role="incremental"]
+* We have a TTCN-3 testsuite with 117 test cases (405 commits in osmo-ttcn3-hacks/pcu/)
+* Logging is more standarized and provides related context (eg. FSM): easier debug
+* Better documented code with spec references backing logic
+* More robust code base
+* TDMA clock tracking: Proper implementation of T31XY and N31XY
+* More efficient: multi-slot UL_TBF, RRBP != N+13, ...
+* Closer to multi-BTS per OsmoPCU co-located with OsmoBSC
+* Allocation of resources without the need to allocate a TBF: Allows for future TBF load-based reallocation
+* Good base for new functionalitites and improvements
+
+.Not so great:
+[role="incremental"]
+* Refactoring not yet complete
+* Limit of 8-TRX per BTS
+* BSSGP/NS code in bad shape (focus so far in RLC/MAC)
+
+== Ericsson RBS support
+
+* TODO: Merged, support since when?
+* OsmoPCU Co-located with OsmoBSC
+* `./configure --enable-er-e1-ccu`
+* Enabled in Osmocom OBS package repositories
+
+* TODO: look at related redmine tickets
+* TODO: look at related commit history:
+* TODO: ask pmaier for review
+* TODO:
+
+== Data Model
+
+include::data_model_graphviz.adoc[]
+
+== Code Architecture
+
+[role="incremental"]
+* Rx PCUIF `INFO.ind`: when BTS/BSC connects, initial configuration of BTS/TRXs/PDCHs
+* Rx PCUIF `DATA.ind`: SAPI=`BCCH` from BTS/BSC with SystemInformation used for configuration
+
+== Code Architecture: Uplink, RACH
+
+[role="incremental"]
+. Rx PCUIF `RACH.ind(BTS-TRX-TS,FN,RA)` from BTS/BSC (over `pcu_sock` or `direct_phy`)
+. One-phase-access:
+[role="incremental"]
+.. Allocate resources: MS, UL_TBF (single slot), TFI, USF, ...
+.. Tx ImmAss over CCCH
+.. Register `TBF_POLL` for the TBF in PDCH ULC
+. Two-phase-access:
+[role="incremental"]
+.. Allocate resources: SBA
+.. Register `SBA` in PDCH ULC, Tx ImmAss over CCCH
+.. Wait for Pkt Resource Request
+
+== Code Architecture: Uplink, PDTCH
+
+[role="incremental"]
+. Rx PCUIF `DATA.ind(BTS-TRX-TS,FN)` SAPI=`PDTCH` from BTS/BSC (over `pcu_sock` or `direct_phy`)
+. Update TDMA clock (per BTS), detect FN jumps
+. `pdch->rcv_block(data, len, fn, meas)`: Handle block: GPRS vs EPGRS, CTRL vs DATA
+.. UL CONTROL:
+[role="incremental"]
+... Decode whole block
+... Handle specifically per msg type (Validate against registered entries in PDCH ULC `TBF_POLL` or `SBA`)
+.. UL DATA:
+[role="incremental"]
+... Decode header => TFI => UL TBF
+... Validate against registered entries in PDCH ULC (`TBF_USF`)
+... Handle data in TBF
+. Expire registered polls up to BTS-TRX-TS included (trigger timeouts)
+
+== Code Architecture Downlink, PDTCH
+
+[role="incremental"]
+. Rx PCUIF `RTS.req(BTS-TRX-TS,FN)` SAPI=`PDTCH` from BTS/BSC (over `pcu_sock` or `direct_phy`), FN in the future!
+. scheduler: `gprs_rlcmac_rcv_rts_block()`
+[role="incremental"]
+.. Check if EGPRS can be used due to GPRS-only MS synchronization requirements
+.. Figure out USF for dl_block based on PDCH ULC state (SBA, polls), or allow UL data Tx (round-robin)
+.. Maybe Tx: DL CTRL block (FSMs, MS/TBF state)
+.. Maybe Tx: DL DATA block (TBF state, round-robin, priority)
+.. Maybe Tx: Dummy control message
+.. Tx PCUIF `DATA.req`
+
+
+== TTCN-3 testsuite
+
+include::ttcn3_component_diagram.adoc[]
+
+== Future
+
+[role="incremental"]
+* Improve TTCN-3 testsuite
+* Convert more C++ -> C
+* Multi-bts support for BSC-colocated
+* >8 TRX per BTS
+* Improve BSSGP/NS code
+* Clean up L1IF vs PCUIF layers (`direct_phy`)
+* Drop dummy ul_tbf objects created during RACH request, instead use some specific type
+* Improve `alloc_algo`, reconfigure TBFs to adapt for user load
+* Improve scheduler
+* Implement TA loop
+* ImplementPower loop
+* ANR: WIP in a branch, not working (deed90dd0030e6ea32ad4d74386cd91fc2f67436)
+
+== Questions ?
+
+* IRC: #osmocom @ freenode
+* link:https://osmocom.org/projects/osmopcu/wiki/OsmoPCU[OsmoPCU redmine project]
+* link:https://gitea.osmocom.org/cellular-infrastructure/osmo-pcu[osmo-pcu.git git repository]
+* Contributing patches via link:https://osmocom.org/projects/cellular-infrastructure/wiki/Gerrit[Osmocom Gerrit]
+
+* Pau Espin Pedrol <pespin@sysmocom.de>

2024/osmodevcon2024/osmo_pcu/ttcn3_component_diagram.adoc

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+[graphviz]
+----
+digraph G {
+  PCU [label="IUT\nosmo-pcu",shape="box", color=red];
+
+  subgraph cluster_ats {
+	label = "ATS\n(TTCN-3)";
+
+	system_PCU_PT [label="port system:PCU"];
+
+	subgraph cluster_RAW_PCU_Test_CT {
+		label = "RAW_PCU_Test_CT\n(PCU_Tests.ttcn)";
+
+		RAW_PCU_MSG_PT_PCUIF_A [label="port RAW_PCU_MSG_PT PCUIF\n(unused)"]
+		PCUVTY [label="PCUVTY"];
+		StatsD_ConnHdlr [label="StatsD_ConnHdlr"];
+		CTRL_Adapter_CT [label="CTRL_Adapter_CT"];
+
+		test [label="testcasename()\n(PCU_Tests.ttcn)", color=red];
+
+		subgraph cluster_bssgp_CT {
+			label="bssgp_CT\nSGSN_Components.ttcn";
+			subgraph cluster_BSSGP_Client_CT {
+				label="BSSGP_Client_CT\nBSSGP_Emulation.ttcnpp";
+				BSSGP_PT [label="port BSSGP_PT BSSGP"];
+			}
+		}
+
+		subgraph cluster_MS_BTS_IFACE_CT {
+			label = "MS_BTS_IFACE_CT\n(GPRS_Components.ttcn)";
+
+			RAW_PCU_MSG_PT_BTS_IFACE [label="port RAW_PCU_MSG_PT BTS"];
+		}
+
+	}
+
+	subgraph cluster_RAW_PCU_BTS_CT {
+		label = "RAW_PCU_BTS_CT\n(PCUIF_Components.ttcn)";
+
+		RAW_PCU_MSG_PT_CLCK_A [label="port RAW_PCU_MSG_PT CLCK"];
+		RAW_PCU_MSG_PT_PCUIF_B [label="port RAW_PCU_MSG_PT PCUIF"];
+		RAW_PCU_MSG_PT_TC [label="port RAW_PCU_MSG_PT TC"];
+
+		subgraph cluster_RAW_PCU_ClckGen_CT {
+			label = "RAW_PCU_ClckGen_CT\n(PCUIF_Components.ttcn)";
+
+			RAW_PCU_MSG_PT_CLCK_B [label="port RAW_PCU_MSG_PT CLCK", color=purple];
+		}
+
+		RAW_PCU_MSG_PT_CLCK_A -> RAW_PCU_MSG_PT_CLCK_B [dir=back];
+		RAW_PCU_MSG_PT_PCUIF_B -> RAW_PCU_MSG_PT_TC [dir=none];
+	}
+
+	subgraph cluster_RAW_PCUIF_CT {
+		label = "RAW_PCUIF_CT\n(PCUIF_Components.ttcn)";
+
+		PCUIF_CODEC_PT_PCU [label="port PCUIF_CODEC_PT PCU"];
+		RAW_PCU_MSG_PT_BTS [label="port RAW_PCU_MSG_PT BTS"];
+		RAW_PCU_MSG_PT_MTC [label="port RAW_PCU_MSG_PT MTC"];
+
+		PCUIF_CODEC_PT_PCU -> RAW_PCU_MSG_PT_BTS  [dir=none];
+		PCUIF_CODEC_PT_PCU -> RAW_PCU_MSG_PT_MTC  [dir=none];
+
+	}
+
+	RAW_PCU_MSG_PT_TC -> RAW_PCU_MSG_PT_BTS_IFACE [dir=none];
+	RAW_PCU_MSG_PT_PCUIF_A -> RAW_PCU_MSG_PT_MTC [dir=none];
+	RAW_PCU_MSG_PT_PCUIF_B -> RAW_PCU_MSG_PT_BTS [dir=none];
+
+	system_PCU_PT -> PCUIF_CODEC_PT_PCU [dir=none];
+
+	test -> RAW_PCU_MSG_PT_BTS_IFACE  [dir=none];
+	test -> RAW_PCU_MSG_PT_PCUIF_A  [label="(unused)", dir=none];
+	test -> BSSGP_PT;
+	test -> PCUVTY;
+	test -> StatsD_ConnHdlr;
+	test -> CTRL_Adapter_CT;
+  }
+
+  PCU -> BSSGP_PT [label="Gb"];
+  PCU -> StatsD_ConnHdlr [label="statsd"];
+  system_PCU_PT -> PCU [label="PCUIF"];
+  PCUVTY -> PCU [label="VTY"];
+  CTRL_Adapter_CT -> PCU [label="CTRL"];
+}
+----

2024/osmodevcon2024/osmocombb_gprs/.gitignore

@@ -0,0 +1,3 @@
+slides*.png
+slides*.txt
+slides.html

2024/osmodevcon2024/osmocombb_gprs/Makefile

@@ -0,0 +1,9 @@
+html: slides.html
+
+slides.html: slides.adoc
+	asciidoc slides.adoc
+
+.PHONY: html
+
+clean:
+	rm -f slides*.png slides*.txt slides.html

2024/osmodevcon2024/osmocombb_gprs/slides.adoc

@@ -0,0 +1,21 @@
+GPRS support in osmocom-bb
+==========================
+:author:	Pau Espin Pedrol <pespin@sysmocom.de>
+:copyright:	2024 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de> (License: CC-BY-SA)
+:backend:	slidy
+:max-width:	45em
+
+== One Slide
+
+* hello
+
+== Second slide
+
+* bye
+
+== Know more
+
+* IRC: #osmocom @ freenode
+* link:https://osmocom.org/projects/cellular-infrastructure/wiki/Mailing_Lists[Osmocom Mailing lists]
+* link:https://osmocom.org/projects/cellular-infrastructure/wiki/Videos_of_Presentations[Osmocom Recorded Presentations, Talks]
+* Contributing patches via link:https://osmocom.org/projects/cellular-infrastructure/wiki/Gerrit[Osmocom Gerrit]