feat(control_allocator): reject actuator group check in flight

according to the land detector. torque / tilt are rejected anyway
because they require pre-armed && !armed, but thrust could previously be
triggered in flight.

src/modules/control_allocator/ActuatorGroupPreflightCheck.cpp

@@ -83,6 +83,12 @@ const char *ActuatorGroupPreflightCheck::validateCommand(uint8_t group, bool is_
 		return "failed to read armed state";
 	}
 
+	vehicle_land_detected_s vehicle_land_detected;
+
+	if (!_vehicle_land_detected_sub.copy(&vehicle_land_detected)) {
+		return "failed to read landed state";
+	}
+
 	// Transient: arming state mismatch. The user can change it and retry.
 	ack_result = vehicle_command_ack_s::VEHICLE_CMD_RESULT_TEMPORARILY_REJECTED;
 
@@ -103,6 +109,11 @@ const char *ActuatorGroupPreflightCheck::validateCommand(uint8_t group, bool is_
 		}
 	}
 
+	// Transient: landed state mismatch
+	if (!vehicle_land_detected.landed) {
+		return "not landed";
+	}
+
 	return nullptr;
 }
 
@@ -150,14 +161,16 @@ void ActuatorGroupPreflightCheck::updateState(hrt_abstime now)
 	if (!_running) { return; }
 
 	actuator_armed_s actuator_armed;
+	vehicle_land_detected_s vehicle_land_detected;
+
+	if (_armed_sub.copy(&actuator_armed) && _vehicle_land_detected_sub.copy(&vehicle_land_detected)) {
 
-	if (_armed_sub.copy(&actuator_armed)) {
 		// Cancel if any of the conditions we depended on at start are lost
-		// (thrust -> armed, torque/tilt -> pre-armed).
+		// (thrust -> armed, torque/tilt -> pre-armed, always !landed).
 		const bool armed_lost = actuator_armed.armed != _requires_armed;
 		const bool prearmed_lost = !_requires_armed && !actuator_armed.prearmed;
 
-		if (armed_lost || prearmed_lost) {
+		if (armed_lost || prearmed_lost || !vehicle_land_detected.landed) {
 			_running = false;
 			sendAck(_last_command, vehicle_command_ack_s::VEHICLE_CMD_RESULT_CANCELLED, now);
 			return;

src/modules/control_allocator/ActuatorGroupPreflightCheck.hpp

@@ -44,18 +44,21 @@
 
 #include <uORB/Publication.hpp>
 #include <uORB/Subscription.hpp>
+
 #include <uORB/topics/actuator_armed.h>
 #include <uORB/topics/vehicle_command.h>
 #include <uORB/topics/vehicle_command_ack.h>
+#include <uORB/topics/vehicle_land_detected.h>
 
 /**
  * Drives the VEHICLE_CMD_ACTUATOR_GROUP_TEST state machine: holds a fixed
  * torque, thrust or collective tilt on a single functional group for a short
  * duration so the operator can verify actuator motion before flight.
  *
- * Arming requirements (enforced both at start and continuously while running):
+ * Pre-conditions (enforced at start, cancelled if not given while running):
  *  - torque and collective-tilt groups: prearmed and *not* armed
  *  - thrust groups: armed
+ *  - landed
  *
  * Losing the required state mid-check results in a CANCELLED ack.
  */
@@ -96,6 +99,7 @@ private:
 
 	uORB::Subscription _vehicle_command_sub{ORB_ID(vehicle_command)};
 	uORB::Subscription _armed_sub{ORB_ID(actuator_armed)};
+	uORB::Subscription _vehicle_land_detected_sub{ORB_ID(vehicle_land_detected)};
 	uORB::Publication<vehicle_command_ack_s> _command_ack_pub{ORB_ID(vehicle_command_ack)};
 
 	bool _running{false};