Safety setup: expose PX4 flight-termination failsafe options (COM_LOW_BAT_ACT = 4, COM_POS_FS_ACT)

[LeonardoHaitzmann]

Feature Description

Description

PX4 main (v1.19) added flight termination as a last-resort failsafe action for parachute-equipped vehicles with no pilot able to take over:

• new COM_LOW_BAT_ACT = 4 ("Return at critical level, terminate at emergency level")
• new parameter COM_POS_FS_ACT (0 Descend if possible — blind descent drifting with the wind — vs 1 Terminate) which applies whenever a failsafe would otherwise
  fall back to Descend.

Neither is selectable in QGC's Safety page today.

References

• PX4 feature PR: feat(commander): add terminate options for critical battery and lost position failsafes PX4/PX4-Autopilot#28064 (merged)
• PX4 docs PR: docs(commander): document terminate options for critical battery and lost position failsafes PX4/PX4-Autopilot#28112 (in review)
• Parameter definitions: https://github.com/PX4/PX4-Autopilot/blob/main/src/modules/commander/commander_params.yaml
• Docs page affected: https://docs.px4.io/main/en/config/safety.html

Proposed change

1. Refresh the bundled PX4 parameter metadata so COM_LOW_BAT_ACT = 4 appears in the existing "Failsafe action" combobox.
2. Add a Position Loss Failsafe section to Safety.VehicleConfig.json exposing COM_POS_FS_ACT as a combobox (Descend if possible / Terminate).

Use Case

Operator of an unpiloted vehicle with a parachute might prefer to pick flight termination over land/descend for emergency battery and position loss from the Safety setup page, instead of
hand-editing raw parameters.

Flight Stacks

PX4

Vehicle Types

Multirotor, Fixed-wing, VTOL

Platforms

All

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[LeonardoHaitzmann]

FYI @hamishwillee