Added test file

Author: philliab13

mission/Landmark_server/test.cpp

@@ -0,0 +1,40 @@
+// /home/philliab/ros2_ws/src/vortex-auv/mission/Landmark_server/test.cpp
+#include <chrono>
+#include <memory>
+#include <string>
+
+#include "rclcpp/rclcpp.hpp"
+#include "std_msgs/msg/string.hpp"
+
+using namespace std::chrono_literals;
+
+class LandmarkServer : public rclcpp::Node
+{
+public:
+    LandmarkServer()
+    : Node("landmark_server")
+    {
+        RCLCPP_INFO(this->get_logger(), "landmark_server node started");
+
+        pub_ = this->create_publisher<std_msgs::msg::String>("chatter", 10);
+
+        timer_ = this->create_wall_timer(500ms, [this]() {
+            auto msg = std_msgs::msg::String();
+            msg.data = "hello from landmark_server";
+            pub_->publish(msg);
+            RCLCPP_DEBUG(this->get_logger(), "published: '%s'", msg.data.c_str());
+        });
+    }
+
+private:
+    rclcpp::Publisher<std_msgs::msg::String>::SharedPtr pub_;
+    rclcpp::TimerBase::SharedPtr timer_;
+};
+
+int main(int argc, char ** argv)
+{
+    rclcpp::init(argc, argv);
+    rclcpp::spin(std::make_shared<LandmarkServer>());
+    rclcpp::shutdown();
+    return 0;
+}