d2fd222a6287e663cfc3815b0fcf1480a03989e5
4
Commits
| Author | SHA1 | Message | Date | |
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 Ashin Walpola
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21e01499d8 |
Drive the bench CAM beacon round a street loop in St. Georg
The bench transmitter sent a parked car: one fixed position, speed 0, no heading, a CAM every second. It now simulates a car driving a loop through six waypoints around Berliner Tor on the real streets, which makes it a moving target for the app's map and the use case detection without taking a car out. The route is generated, not hand-traced. tools/make_route.py asks the OSRM demo server for a driving route through the waypoints and back to the first, thins the 371 street points to 103 (none more than 1.5 m off the line), and writes main/route_points.h. It also saves OSRM's answer (--offline rebuilds from it) and a map page to check the route before flashing. Each waypoint is sent with the direction towards the next one: without it, points on divided roads such as Beim Strohhause snapped to the opposite carriageway and the loop came out at 8.4 km of U-turns. With it the loop is 5.2 km, still including two turn-round detours that OSRM needs to reach the waypoints legally (Borgfelder Strasse / Anckelmannsplatz, and Nagelsweg / Norderstrasse / Repsoldstrasse). Route data (c) OpenStreetMap contributors, ODbL. main/route.c moves the car along the points. It cruises at 50 km/h and limits each bend to the speed that keeps sideways acceleration at 2 m/s^2, so a junction turn is taken at about 15 km/h and a gentle curve barely slows it; braking (2 m/s^2) and acceleration (1.5 m/s^2) are planned across as many points as a bend needs. A simulated lap on the host is 5.16 km in 7.7 min, averaging 40 km/h. CAMs now follow the EN 302 637-2 generation rules instead of a fixed 1 Hz: checked every 100 ms, sent on a heading change over 4 degrees, a move over 4 m, a speed change over 0.5 m/s, or after 1 s - about 3 Hz at 50 km/h. generationDeltaTime is milliseconds since boot. The GeoNetworking source position vector now carries the same speed and heading as the CAM instead of zeros. NOTES.md gains build and flash steps (including reading a board's app descriptor first, since both firmwares name their image obu_firmware.bin) and a section on the simulated drive. The pointer to docs/04-transmit-setup.md is corrected: that file is not in the repo. Flashed to the COM8 board and checked on its console: it starts driving on power-up and sends CAMs with changing position, speed and heading. Not yet received over the air. |
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Ashin Walpola
|
8871708a98 |
Send the GeoNetworking lifetime as 1 s, not 3200 s
geonet_wrap_shb wrote lifetime 0x83, commented as about 60 s. The field holds the multiplier in its upper six bits and the base in the lower two (50 ms, 1 s, 10 s, 100 s), so 0x83 is 32 x 100 s = 3200 s. That is over the 600 s itsGnMaxPacketLifetime a sender may use at all; vanetza refuses to send such a packet. The byte arrived with the Phase 03 commit as a placeholder and was never checked against the encoding. For a single-hop CAM this is non-compliance rather than a functional fault: nothing stores or forwards an SHB packet, so no receiver acts on the value, and no dropped CAM was ever traced to it. 0x05 (1 x 1 s) is what every other station in its-g5-receiver-firmware/recordings sends its CAMs with; the recorded GeoBroadcast DENMs use 0x79 (30 s). Changed in obu-cam-transmistter's copy as well. Both firmwares build (IDF 6.1 and 5.5.4), and the disassembled geonet_wrap_shb of each stores 0x05. Not yet seen on air: the production OBU still runs the 2026-09-10 build, and the on-air check is listed in TODO.md. |
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Ashin Walpola
|
0ccb867228 |
DENM over-the-air receive on the ESP32-C5 path
The firmware forwarded CAM only: gn_unwrap_cam accepted single-hop broadcast (HT=5) and BTP port 2001, so every DENM was dropped before it reached the phone. Real OBUs disseminate DENM by GeoBroadcast (HT=4), whose 44-byte extended header also carries the hazard's relevance area - materially more useful on a map than the sender's own position, since a sender may be relaying for someone else. Firmware - gn_unwrap_cam -> gn_unwrap_its: accepts GeoBroadcast alongside TSB/SHB, and BTP ports 2001 and 2002, extracting the GeoBroadcast destination area. Both extended-header lengths were measured against live air capture rather than read off a spec table. Secured packets (Basic Header NextHeader=2) are rejected rather than misparsed. - SERIAL_MSG_CAM_RX (0x02) superseded by SERIAL_MSG_V2X_RX (0x04): a 14-byte prefix carrying BTP port, RSSI and the destination area. Adding MAPEM later needs a decoder on the phone but no protocol change. 0x02 stays reserved so the numbering is not silently reused. - Promiscuous RX capture buffer 400 -> 800 bytes. A real GeoBroadcast DENM is around 500 bytes on air and was being truncated mid-payload, which no amount of correct unwrapping downstream could have recovered from. - geonet_wrap_shb, both firmwares: the SHB extended header is 28 bytes, not 24. The Source Position Vector is followed by a 4-byte reserved field; without it a standards-strict receiver reads the CAM payload's first two bytes as the BTP destination port. App - DenmUperCodec: UPER decoder for the ManagementContainer and the SituationContainer's eventType. ValidityDuration is 17 bits, not 16, and ManagementContainer, SituationContainer and CauseCode each carry their own extension bit - a single wrong bit made a real frame read causeCode 47 instead of 94. - DenmEvent gains actionID (originatingStationID + sequenceNumber), stationType, termination, detectionTime, relevance radius and RSSI. Dedup keys on actionID where available, so a termination lands on the event it ends instead of creating a second pin. - denmEvents merges the MQTT and over-the-air sources and drops terminated events. The V2X list view now shows hazards above the CAM stations; it previously took no DENM parameter at all, so hazards reached the map but never the list. - DenmParser: the Use Case API sends causeCode as a string enum, so reading it as an Int always yielded null. Testing - DenmAirReceiveTest covers the V2X_RX prefix and the decoder using real frames from a live capture as fixtures. Expected values were cross-checked against the ETSI ASN.1 modules via asn1tools, which agreed on all 1885 decodable DENMs across the capture set, every field including detectionTime. - Verified on hardware: a CiT One HLN-SV DENM decodes as cause 94/0 with a 1000 m relevance radius at 1 Hz alongside CAM, with no decode failures and no unexpected BTP ports. Also replaces em dashes with hyphens throughout the user-facing strings, including the German translation. |
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Ashin Walpola
|
f507a8a9fd |
Fix UPER encoding of CurvatureCalculationMode; verified on hardware
CurvatureCalculationMode is the one extensible ENUMERATED in CAM:
ENUMERATED {yawRateUsed(0), yawRateNotUsed(1), unavailable(2), ...}
UPER encodes an extensible ENUMERATED as an extension bit followed by the root
index - 1 + 2 = 3 bits. All three of our encoders wrote only the 2-bit index,
shifting yawRate and the entire low-frequency container one bit early for any
standards-compliant receiver.
It went unnoticed because every end of this project shared the mistake: the
Kotlin codec was ported bit-for-bit from cam.c, so phone and ESP32 agreed
perfectly with each other and with nothing else. Confirmed against the ETSI
ASN.1 in the C-ITS-Parser checkout, where rasn marks this type - and only this
type - #[non_exhaustive].
Fixed in all three copies of the encoder (app CamUperCodec.kt,
obu-firmware/main/cam.c, obu-cam-transmistter/main/cam.c) plus the decoder,
which now rejects rather than misreads a set extension bit. Frame size is
unchanged at 43 bytes. Transmitter reflashed and the phone decodes its CAMs.
Also in this change:
- serial_link: skip send_frame entirely when no USB host is attached, and raise
the tx mutex timeout above the worst-case hold. With the phone unplugged every
write blocked its full timeout while holding the lock, so forwarded CAM_RX
traffic starved the 1 Hz heartbeat - observed as "tx mutex timeout, dropping
frame" on the console, and it would have tripped the phone's link watchdog.
Verified gone on hardware.
- Log decoded and failed CAMs in CamUseCaseRepository. "The app shows nothing"
had two indistinguishable causes; a silent `?: return` made this bug much
harder to find than it needed to be.
- Remove the ESP32 send-only/send-and-receive toggle. Reception can't be
disabled in firmware (raw TX only works while promiscuous), so it was an
app-side filter pretending to be a radio control.
- V2X monitor follows the serial link state on the ESP32 path instead of MQTT,
which is permanently disconnected there; CAM intake is gated on the link being
up, and engine state is cleared when it drops.
- About screen: 0.5.0, Phase 03.
- Track obu-cam-transmistter, the bench CAM transmitter. Its cam.c is compiled
(unlike obu-firmware's reference copy) and must stay bit-identical to the other
two - this commit is what that coupling costs when it's broken.
- Document the two-toolchain split: this project builds on IDF 5.5.4, obu-firmware
on the pinned 6.1. Exporting both in one shell fails confusingly.
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