simulation/gz_bridge: rc_cessna plane model working, Gazebo Garden updates, and prepare for proper airspeed (#20989)

Co-authored-by: Benjamin Perseghetti <bperseghetti@rudislabs.com>
Co-authored-by: Alejandro Hernández Cordero <ahcorde@gmail.com>

ROMFS/px4fmu_common/init.d-posix/airframes/4003_gz_rc_cessna

@@ -1,6 +1,6 @@
 #!/bin/sh
 #
-# @name Gazebo plane
+# @name Gazebo rc_cessna
 # @type Fixedwing
 #
 
@@ -8,7 +8,7 @@
 
 PX4_SIMULATOR=${PX4_SIMULATOR:=gz}
 PX4_GZ_WORLD=${PX4_GZ_WORLD:=default}
-PX4_SIM_MODEL=${PX4_SIM_MODEL:=plane}
+PX4_SIM_MODEL=${PX4_SIM_MODEL:=rc_cessna}
 
 param set-default EKF2_MAG_ACCLIM 0
 param set-default EKF2_MAG_YAWLIM 0

ROMFS/px4fmu_common/init.d-posix/airframes/CMakeLists.txt

@@ -72,7 +72,7 @@ px4_add_romfs_files(
 
 	4001_gz_x500
 	4002_gz_x500_depth
-	4003_gz_plane
+	4003_gz_rc_cessna
 
 	6011_gazebo-classic_typhoon_h480
 	6011_gazebo-classic_typhoon_h480.post

ROMFS/px4fmu_common/init.d-posix/px4-rc.simulator

@@ -21,7 +21,7 @@ if [ "$PX4_SIMULATOR" = "sihsim" ] || [ "$(param show -q SYS_AUTOSTART)" -eq "0"
 
 elif [ "$PX4_SIMULATOR" = "gz" ] || [ "$(param show -q SIM_GZ_EN)" -eq "1" ]; then
 
-	# source generated gz_env.sh for IGN_GAZEBO_RESOURCE_PATH
+	# source generated gz_env.sh for GZ_SIM_RESOURCE_PATH
 	if [ -f ./gz_env.sh ]; then
 		. ./gz_env.sh
 
@@ -37,16 +37,8 @@ elif [ "$PX4_SIMULATOR" = "gz" ] || [ "$(param show -q SIM_GZ_EN)" -eq "1" ]; th
 		gz_command="gz"
 		gz_sub_command="sim"
 	else
-		IGN_GAZEBO_VERSIONS=$(ign gazebo --versions 2>&1)
-		if [ $? -eq 0 ] && [ "${IGN_GAZEBO_VERSIONS}" != "" ]
-		then
-			# "ign gazebo" for Fortress and earlier
-			gz_command="ign"
-			gz_sub_command="gazebo"
-		else
-			echo "ERROR [init] Gazebo gz and ign commands unavailable"
-			exit 1
-		fi
+		echo "ERROR [init] Gazebo gz please install gz-garden"
+		exit 1
 	fi
 
 	# look for running ${gz_command} gazebo world