px4-firmware/launch/single_vehcile_spawn.launch

<launch>

    <!-- Posix SITL environment launch script -->
    <arg name="x" default="0"/>
    <arg name="y" default="0"/>
    <arg name="z" default="0"/>
    <arg name="R" default="0"/>
    <arg name="P" default="0"/>
    <arg name="Y" default="0"/>
    <arg name="est" default="ekf2"/>
    <arg name="vehicle" default="iris"/>
    <arg name="ID" default="1"/>
    <arg name="rcS" default="$(find px4)/posix-configs/SITL/init/$(arg est)/$(arg vehicle)_$(arg ID)"/>
    <arg name="mavlink_udp_port" default="14560" />



    <arg name="cmd" default="$(find xacro)/xacro $(find px4)/Tools/sitl_gazebo/models/rotors_description/urdf/$(arg vehicle)_base.xacro rotors_description_dir:=$(find px4)/Tools/sitl_gazebo/models/rotors_description mavlink_udp_port:=$(arg mavlink_udp_port) --inorder"/>


    <param command="$(arg cmd)" name="rotors_description" />

    <node name="sitl_$(arg ID)" pkg="px4" type="px4" output="screen"
        args="$(find px4) $(arg rcS)">
    </node>

    <node name="$(arg vehicle)_$(arg ID)_spawn" output="screen" pkg="gazebo_ros" type="spawn_model"
        args="-urdf -param rotors_description -model $(arg vehicle)_$(arg ID) -package_to_model -x $(arg x) -y $(arg y) -z $(arg z) -R $(arg R) -P $(arg P) -Y $(arg Y)"/>


</launch>

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