Auto-play argument

Desired behavior

In the ROS 1 version of this package (ros_ign), the simulator would "play" as soon as it started running. In the current ROS 2 version I have to hit the play button every time. I can understand how some people would prefer this new behavior, but it is a pain for me. Could this be exposed as a launch argument? I would like to be able to choose if the simulator should start up right away or wait for user input.

The command line parameter exists for gz-sim, but it hasn't been exposed as part of the launch file. It should be relatively straightforward to add here:

ros_gz/ros_gz_sim/launch/gz_sim.launch.py.in

Lines 63 to 70 in 0882b17

    
           return [ExecuteProcess( 
        
                   cmd=[exec, exec_args, '--force-version', gz_version], 
        
                   output='screen', 
        
                   additional_env=env, 
        
                   shell=True, 
        
                   prefix=debug_prefix, 
        
                   on_exit=on_exit 
        
               )]

The -r CLI flag will cause the simulation to start as soon as gazebo is loaded.

Thanks for the tip, adding -r to gz_args works.

	return [ExecuteProcess(
	cmd=[exec, exec_args, '--force-version', gz_version],
	output='screen',
	additional_env=env,
	shell=True,
	prefix=debug_prefix,
	on_exit=on_exit
	)]