public static void Main(string[] args)
{
Context ctx = new Context();
Rclcs.Init(ctx);
INode node = Rclcs.CreateNode("listener", ctx);
ISubscription <std_msgs.msg.String> chatter_sub = node.CreateSubscription <std_msgs.msg.String>(
"chatter", msg => Console.WriteLine("I heard: [" + msg.Data + "]"));
Rclcs.Spin(node, ctx);
Rclcs.Shutdown(ctx);
}