UPS input comes from the ignition-switched socket via a 15 V PD
trigger, so input loss means cranking or ignition off. The INA219
(monitor-only) gives the battery current sign; a host service would mark
cranks, then after a grace period close the recording and power off,
with a voltage floor as backstop. Records the open hardware problem:
after poweroff the UPS keeps the board powered, so it drains and
doesn't auto-start at ignition on.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
In the car with ignition on, the listen-only probe found 500 kbps (2673
frames in 3 s, zero RX errors; nothing at other rates). The OBD port
isn't gatewayed: 27 periodic IDs, ~893 frames/s. A udev rule now starts
can-up@can_pcan on boot and hot-plug with 500k and listen-only, to be
dropped when obd-poller becomes the single writer.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
500 kbps is the likely era standard but unconfirmed for the Colt, so no
persistent bitrate yet. Adds a listen-only probe (installed on the car
unit as can-bitrate-probe) that cycles common rates without disturbing
the bus, the fallback if the OBD port is gatewayed and silent, and what
to persist once the rate is known.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
mikkeli