Let me first explain the use case. I (and some fellow cave explorers I
dive with) dive mCCR units (Kiss Classic specifically) in its most
primitive form. No attached divecomputer to the mCCR, but only some
analog po2 devices to fly the unit. This obviously results in no logging
from po2 sensors. I use a OSTC3, and most of my buddies some Shearwater
divecomputer. As I am (at this point), not aware how a Shearwater
handles this use case, I consider only an OSTC3 for now.
it appears, in the current code, the manual changes of setpoint on the
divecomputer are correctly recorded (as events) and are correctly
handled on import from the OSTC3 in to Subsurface. The initial setpoint
at the start of the dive is, however, a little bit a can of worms. The
OSCTS3 does not record a setpoint change at the beginning of the dive,
and the recorded po2 values are from the diluent (so not very useful).
To deal with this use case, had to adapt libdivecomputer (see my branch
https://github.com/janmulder/libdc/tree/ostc3-upd), and after that
Subsurface (https://github.com/janmulder/subsurface/tree/ccr-po2-issue-2).
As libdivecomputer did not interface the fixed setpoints (including the
initial one at the start of the dive), I had to add those. After that,
Subsurface can determine the initial setpoint. For completeness, this
setpoint is added to the XML and git storage backends as well.
I would really appreciate a review for this change.
best,
--jan
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