{"id":4323,"date":"2025-10-31T14:04:37","date_gmt":"2025-10-31T14:04:37","guid":{"rendered":"https:\/\/learnbydoing.dev\/?p=4323"},"modified":"2026-01-10T21:53:25","modified_gmt":"2026-01-10T21:53:25","slug":"creating-and-managing-a-lifecycle-node-in-ros-2-with-c","status":"publish","type":"post","link":"https:\/\/learnbydoing.dev\/creating-and-managing-a-lifecycle-node-in-ros-2-with-c\/","title":{"rendered":"Creating and Managing a Lifecycle Node in ROS 2 with C++"},"content":{"rendered":"
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  • \n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\n\t\t\t\tROS 2<\/span>, Tutoriales<\/span>\t\t\t\t<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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    When developing complex robotic systems, managing the operational state of each node precisely is essential to ensure stability, safety, and predictability.
    ROS 2 introduces a key concept to meet this need: Lifecycle Nodes<\/strong>.<\/p>\n

    \u00a0<\/p>\n

    Unlike standard nodes, which start operating as soon as they are launched, Lifecycle Nodes allow you to explicitly control their behavior<\/strong> through a series of well-defined states and transitions.<\/p>\n


    This approach enables developers to decide when<\/em> a node should activate, when<\/em> it should stop, and when<\/em> it should release its resources \u2014 offering total control over the system\u2019s behavior.<\/p>\n

    \u00a0<\/p>\n

    If you want to first understand the theory behind Lifecycle Nodes and see a Python implementation, check out the related article \u201cLifecycle Node in Python\u201d<\/em>, where we explain the core principles of the ROS 2 Lifecycle system.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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    \ud83e\uddd0 Lifecycle Nodes in ROS 2 \u2014 theoretical background<\/strong><\/h3>\n

    A Lifecycle Node<\/strong> (or managed node) goes through a series of states:<\/p>\n

    \u00a0<\/p>\n

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      Unconfigured<\/strong> \u2013 the node is created but has not yet initialized its resources.<\/p>\n<\/li>\n

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      Inactive<\/strong> \u2013 the node is configured but not yet publishing or acting.<\/p>\n<\/li>\n

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      Active<\/strong> \u2013 the node is fully operational and communicating with other system components.<\/p>\n<\/li>\n

    • \n

      Finalized \/ Shutdown<\/strong> \u2013 the node releases its resources in a controlled shutdown.<\/p>\n<\/li>\n<\/ul>\n

      \u00a0<\/p>\n

      Each transition between states can be linked to a callback<\/strong> \u2014 a function that defines what happens when the node enters or exits a particular state.<\/p>\n


      This structured model allows developers to build systems that are more reliable, predictable, and easier to manage, especially in distributed or industrial applications.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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      Creating a Lifecycle Node in C++<\/strong><\/h3>\n

      Let\u2019s now see how to implement a Lifecycle Node in C++<\/strong> using the native ROS 2 API.
      The following code example comes from the lab L37_C++_Create a Lifecycle Node<\/em>.<\/p>\n

      <\/code><\/p>\n

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      \n\t\t\t\t\n\t\t\t\t\t#include \"rclcpp\/rclcpp.hpp\"\r\n#include \"rclcpp_lifecycle\/lifecycle_node.hpp\"\r\n\r\nusing rclcpp_lifecycle::LifecycleNode;\r\nusing CallbackReturn = rclcpp_lifecycle::node_interfaces::LifecycleNodeInterface::CallbackReturn;\r\n\r\nclass MyLifecycleNode : public LifecycleNode\r\n{\r\npublic:\r\n    explicit MyLifecycleNode(const rclcpp::NodeOptions & options)\r\n    : LifecycleNode(\"my_lifecycle_node\", options)\r\n    {\r\n    }\r\n\r\n    CallbackReturn on_configure(const rclcpp_lifecycle::State &)\r\n    {\r\n        RCLCPP_INFO(get_logger(), \"Configuring...\");\r\n        return CallbackReturn::SUCCESS;\r\n    }\r\n\r\n    CallbackReturn on_activate(const rclcpp_lifecycle::State &)\r\n    {\r\n        RCLCPP_INFO(get_logger(), \"Activating...\");\r\n        return CallbackReturn::SUCCESS;\r\n    }\r\n\r\n    CallbackReturn on_deactivate(const rclcpp_lifecycle::State &)\r\n    {\r\n        RCLCPP_INFO(get_logger(), \"Deactivating...\");\r\n        return CallbackReturn::SUCCESS;\r\n    }\r\n\r\n    CallbackReturn on_cleanup(const rclcpp_lifecycle::State &)\r\n    {\r\n        RCLCPP_INFO(get_logger(), \"Cleaning up...\");\r\n        return CallbackReturn::SUCCESS;\r\n    }\r\n\r\n    CallbackReturn on_shutdown(const rclcpp_lifecycle::State &)\r\n    {\r\n        RCLCPP_INFO(get_logger(), \"Shutting down...\");\r\n        return CallbackReturn::SUCCESS;\r\n    }\r\n};\r\n\r\nint main(int argc, char * argv[])\r\n{\r\n    rclcpp::init(argc, argv);\r\n    auto lc_node = std::make_shared<MyLifecycleNode>(rclcpp::NodeOptions());\r\n    rclcpp::spin(lc_node->get_node_base_interface());\r\n    rclcpp::shutdown();\r\n    return 0;\r\n}\r\n<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-961c2f7 elementor-widget elementor-widget-text-editor\" data-id=\"961c2f7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h3 data-start=\"2586\" data-end=\"2639\"><strong>\ud83e\udde0 Breaking Down the Code<\/strong><\/h3>\n<p data-start=\"1530\" data-end=\"1656\"><code data-start=\"1690\" data-end=\"1695\"><\/code><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-635f0ee elementor-widget elementor-widget-code-highlight\" data-id=\"635f0ee\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"code-highlight.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"prismjs-tomorrow copy-to-clipboard\">\n\t\t\t<pre data-line=\"\" class=\"highlight-height language-cpp line-numbers\">\n\t\t\t\t<code readonly=\"true\" class=\"language-cpp\">\n\t\t\t\t\t<xmp>#include \"rclcpp\/rclcpp.hpp\"\r\n#include \"rclcpp_lifecycle\/lifecycle_node.hpp\"\r\n<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-424d237 elementor-widget elementor-widget-text-editor\" data-id=\"424d237\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"4742\" data-end=\"4808\">These lines include the core ROS 2 libraries and the lifecycle extension <code data-start=\"3927\" data-end=\"3945\">rclcpp_lifecycle<\/code>, which provides all the tools needed to manage node life cycles.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-34e2893 elementor-widget elementor-widget-code-highlight\" data-id=\"34e2893\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"code-highlight.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"prismjs-tomorrow copy-to-clipboard\">\n\t\t\t<pre data-line=\"\" class=\"highlight-height language-cpp\">\n\t\t\t\t<code readonly=\"true\" class=\"language-cpp\">\n\t\t\t\t\t<xmp>using rclcpp_lifecycle::LifecycleNode;\r\nusing CallbackReturn = rclcpp_lifecycle::node_interfaces::LifecycleNodeInterface::CallbackReturn;\r\n<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0ed0bb9 elementor-widget elementor-widget-text-editor\" data-id=\"0ed0bb9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"3907\" data-end=\"4070\">Here we define shorthand aliases for convenience.<br data-start=\"4214\" data-end=\"4217\" \/><code data-start=\"4217\" data-end=\"4232\">LifecycleNode<\/code> is the base class for managed nodes, while <code data-start=\"4276\" data-end=\"4292\">CallbackReturn<\/code> defines the type that transition callbacks must return.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fbbfe30 elementor-widget elementor-widget-code-highlight\" data-id=\"fbbfe30\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"code-highlight.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"prismjs-tomorrow copy-to-clipboard\">\n\t\t\t<pre data-line=\"\" class=\"highlight-height language-cpp\">\n\t\t\t\t<code readonly=\"true\" class=\"language-cpp\">\n\t\t\t\t\t<xmp>class MyLifecycleNode : public LifecycleNode\r\n<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-dc28add elementor-widget elementor-widget-text-editor\" data-id=\"dc28add\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"4153\" data-end=\"4283\">We declare a class named <code data-start=\"4436\" data-end=\"4453\">MyLifecycleNode<\/code> that inherits from <code data-start=\"4473\" data-end=\"4488\">LifecycleNode<\/code>.<br data-start=\"4489\" data-end=\"4492\" \/>This allows us to override the lifecycle callback methods and define custom behaviors for each transition.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7da3562 elementor-widget elementor-widget-code-highlight\" data-id=\"7da3562\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"code-highlight.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"prismjs-tomorrow copy-to-clipboard\">\n\t\t\t<pre data-line=\"\" class=\"highlight-height language-cpp\">\n\t\t\t\t<code readonly=\"true\" class=\"language-cpp\">\n\t\t\t\t\t<xmp>explicit MyLifecycleNode(const rclcpp::NodeOptions & options)\r\n: LifecycleNode(\"my_lifecycle_node\", options)\r\n<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a73b77a elementor-widget elementor-widget-text-editor\" data-id=\"a73b77a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>This constructor initializes the node with the name <code data-start=\"4776\" data-end=\"4795\">my_lifecycle_node<\/code> and applies configuration options.<br data-start=\"4830\" data-end=\"4833\" \/>The <code data-start=\"4837\" data-end=\"4847\">explicit<\/code> keyword prevents implicit conversions, improving code safety.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9790003 elementor-widget elementor-widget-code-highlight\" data-id=\"9790003\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"code-highlight.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"prismjs-tomorrow copy-to-clipboard\">\n\t\t\t<pre data-line=\"\" class=\"highlight-height language-cpp\">\n\t\t\t\t<code readonly=\"true\" class=\"language-cpp\">\n\t\t\t\t\t<xmp>CallbackReturn on_configure(const rclcpp_lifecycle::State &)\r\n{\r\n    RCLCPP_INFO(get_logger(), \"Configuring...\");\r\n    return CallbackReturn::SUCCESS;\r\n}\r\n<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-09ad431 elementor-widget elementor-widget-text-editor\" data-id=\"09ad431\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"1569\" data-end=\"1754\">The <code data-start=\"5081\" data-end=\"5097\">on_configure()<\/code> callback is triggered when the node transitions from <em data-start=\"5151\" data-end=\"5165\">unconfigured<\/em> to <em data-start=\"5169\" data-end=\"5179\">inactive<\/em>.<br data-start=\"5180\" data-end=\"5183\" \/>Here, we would typically load parameters, initialize publishers or resources, and prepare the node for operation.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-41dc26a elementor-widget elementor-widget-code-highlight\" data-id=\"41dc26a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"code-highlight.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"prismjs-tomorrow copy-to-clipboard\">\n\t\t\t<pre data-line=\"\" class=\"highlight-height language-cpp\">\n\t\t\t\t<code readonly=\"true\" class=\"language-cpp\">\n\t\t\t\t\t<xmp>CallbackReturn on_activate(const rclcpp_lifecycle::State &)\r\n{\r\n    RCLCPP_INFO(get_logger(), \"Activating...\");\r\n    return CallbackReturn::SUCCESS;\r\n}\r\n<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a962652 elementor-widget elementor-widget-text-editor\" data-id=\"a962652\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"1949\" data-end=\"2139\">The <code data-start=\"5466\" data-end=\"5481\">on_activate()<\/code> callback runs when the node becomes <em data-start=\"5518\" data-end=\"5526\">active<\/em>.<br data-start=\"5527\" data-end=\"5530\" \/>At this stage, publishers, subscribers, or timers are enabled \u2014 the node is now fully operational.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c2c1ba4 elementor-widget elementor-widget-code-highlight\" data-id=\"c2c1ba4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"code-highlight.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"prismjs-tomorrow copy-to-clipboard\">\n\t\t\t<pre data-line=\"\" class=\"highlight-height language-cpp\">\n\t\t\t\t<code readonly=\"true\" class=\"language-cpp\">\n\t\t\t\t\t<xmp>CallbackReturn on_deactivate(const rclcpp_lifecycle::State &)\r\n{\r\n    RCLCPP_INFO(get_logger(), \"Deactivating...\");\r\n    return CallbackReturn::SUCCESS;\r\n}\r\n<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b70a0c1 elementor-widget elementor-widget-text-editor\" data-id=\"b70a0c1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The <code data-start=\"5802\" data-end=\"5819\">on_deactivate()<\/code> callback handles the transition from <em data-start=\"5857\" data-end=\"5865\">active<\/em> to <em data-start=\"5869\" data-end=\"5879\">inactive<\/em>.<br data-start=\"5880\" data-end=\"5883\" \/>It\u2019s used to pause activity while keeping resources available for reactivation.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6b53ddc elementor-widget elementor-widget-code-highlight\" data-id=\"6b53ddc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"code-highlight.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"prismjs-tomorrow copy-to-clipboard\">\n\t\t\t<pre data-line=\"\" class=\"highlight-height language-cpp\">\n\t\t\t\t<code readonly=\"true\" class=\"language-cpp\">\n\t\t\t\t\t<xmp>CallbackReturn on_cleanup(const rclcpp_lifecycle::State &)\r\n{\r\n    RCLCPP_INFO(get_logger(), \"Cleaning up...\");\r\n    return CallbackReturn::SUCCESS;\r\n}\r\n<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f590093 elementor-widget elementor-widget-text-editor\" data-id=\"f590093\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"6403\" data-end=\"6591\">The <code data-start=\"6132\" data-end=\"6146\">on_cleanup()<\/code> callback frees resources and resets parameters, returning the node to the <em data-start=\"6221\" data-end=\"6235\">unconfigured<\/em> state \u2014 ready for reconfiguration.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8759947 elementor-widget elementor-widget-code-highlight\" data-id=\"8759947\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"code-highlight.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"prismjs-tomorrow copy-to-clipboard\">\n\t\t\t<pre data-line=\"\" class=\"highlight-height language-cpp\">\n\t\t\t\t<code readonly=\"true\" class=\"language-cpp\">\n\t\t\t\t\t<xmp>CallbackReturn on_shutdown(const rclcpp_lifecycle::State &)\r\n{\r\n    RCLCPP_INFO(get_logger(), \"Shutting down...\");\r\n    return CallbackReturn::SUCCESS;\r\n}\r\n<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-acb53bd elementor-widget elementor-widget-text-editor\" data-id=\"acb53bd\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"6798\" data-end=\"6840\">The <code data-start=\"6443\" data-end=\"6458\">on_shutdown()<\/code> callback executes during final shutdown.<br data-start=\"6499\" data-end=\"6502\" \/>It\u2019s the ideal place to save data, close files, and release hardware safely.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4872011 elementor-widget elementor-widget-code-highlight\" data-id=\"4872011\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"code-highlight.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"prismjs-tomorrow copy-to-clipboard\">\n\t\t\t<pre data-line=\"\" class=\"highlight-height language-cpp\">\n\t\t\t\t<code readonly=\"true\" class=\"language-cpp\">\n\t\t\t\t\t<xmp>int main(int argc, char * argv[])\r\n{\r\n    rclcpp::init(argc, argv);\r\n    auto lc_node = std::make_shared<MyLifecycleNode>(rclcpp::NodeOptions());\r\n    rclcpp::spin(lc_node->get_node_base_interface());\r\n    rclcpp::shutdown();\r\n    return 0;\r\n}\r\n<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3c61bba elementor-widget elementor-widget-text-editor\" data-id=\"3c61bba\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"7843\" data-end=\"7858\">The <code data-start=\"6837\" data-end=\"6845\">main()<\/code> function initializes ROS 2, creates an instance of the node, spins it to keep it running, and then shuts down cleanly.<br data-start=\"6964\" data-end=\"6967\" \/>The <code data-start=\"6971\" data-end=\"6979\">spin()<\/code> call ensures the node stays active until an external shutdown signal is received.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6e30ba6 elementor-widget elementor-widget-text-editor\" data-id=\"6e30ba6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h3 data-start=\"7068\" data-end=\"7107\"><strong>Managing Lifecycle Nodes via CLI<\/strong><\/h3>\n<p data-start=\"7109\" data-end=\"7314\">Once the node is running, you can control its state directly from the terminal using ROS 2\u2019s command-line interface.<br data-start=\"7225\" data-end=\"7228\" \/>This tool allows you to move the node between states \u2014 ideal for testing or debugging.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9e625c4 elementor-widget elementor-widget-code-highlight\" data-id=\"9e625c4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"code-highlight.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"prismjs-tomorrow copy-to-clipboard\">\n\t\t\t<pre data-line=\"\" class=\"highlight-height language-bash\">\n\t\t\t\t<code readonly=\"true\" class=\"language-bash\">\n\t\t\t\t\t<xmp>ros2 lifecycle set \/my_lifecycle_node configure\r\nros2 lifecycle set \/my_lifecycle_node activate\r\nros2 lifecycle set \/my_lifecycle_node deactivate\r\nros2 lifecycle set \/my_lifecycle_node cleanup\r\nros2 lifecycle set \/my_lifecycle_node shutdown\r\n<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a76dd41 elementor-widget elementor-widget-text-editor\" data-id=\"a76dd41\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"7363\" data-end=\"7396\">Each command triggers the corresponding callback in the code.<br data-start=\"7627\" data-end=\"7630\" \/>To check the node\u2019s current state, simply run:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-806e6b5 elementor-widget elementor-widget-code-highlight\" data-id=\"806e6b5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"code-highlight.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"prismjs-tomorrow copy-to-clipboard\">\n\t\t\t<pre data-line=\"\" class=\"highlight-height language-bash\">\n\t\t\t\t<code readonly=\"true\" class=\"language-bash\">\n\t\t\t\t\t<xmp>ros2 lifecycle get \/my_lifecycle_node\r\n<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5e371d2 elementor-widget elementor-widget-text-editor\" data-id=\"5e371d2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"7363\" data-end=\"7396\">This mechanism makes Lifecycle Nodes perfect for distributed robotics environments where multiple components must be activated and deactivated in a controlled order.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cebe6cb elementor-widget elementor-widget-text-editor\" data-id=\"cebe6cb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h3 data-start=\"7901\" data-end=\"7943\"><strong>Why Lifecycle Nodes Matter in ROS 2<\/strong><\/h3>\n<p data-start=\"7945\" data-end=\"8134\">Lifecycle Nodes are one of the most significant advancements of ROS 2 compared to ROS 1.<br data-start=\"8033\" data-end=\"8036\" \/>They provide <strong data-start=\"8049\" data-end=\"8074\">deterministic control<\/strong>, promote <strong data-start=\"8084\" data-end=\"8098\">modularity<\/strong>, and ensure <strong data-start=\"8111\" data-end=\"8133\">system reliability<\/strong>.<\/p>\n<p data-start=\"8136\" data-end=\"8440\">In industrial and research applications, they are essential for ensuring that sensors activate only when the system is ready and that actuators deactivate safely.<br data-start=\"8298\" data-end=\"8301\" \/>They also make it possible to dynamically reconfigure systems without restarting the entire application \u2014 improving uptime and flexibility.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-078e0ac elementor-widget elementor-widget-text-editor\" data-id=\"078e0ac\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h3 data-start=\"8212\" data-end=\"8228\"><strong>\ud83c\udfaf Conclusion<\/strong><\/h3>\n<p data-start=\"8465\" data-end=\"8776\">In this article, we explored how to create and manage a <strong data-start=\"8521\" data-end=\"8558\">Lifecycle Node in ROS 2 using C++<\/strong>, analyzing the full code and comparing it to the version described in <em data-start=\"8629\" data-end=\"8657\">\u201cLifecycle Node in Python\u201d<\/em>.<br data-start=\"8658\" data-end=\"8661\" \/>We learned how to define transition callbacks, monitor node states, and use the ROS 2 CLI for lifecycle management.<\/p>\n<p data-start=\"8873\" data-end=\"9285\">\u00a0<\/p>\n<p data-start=\"8873\" data-end=\"9285\">Scroll down to discover how to access the full course today and take your ROS 2 development to the next level.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-c5d20e7 e-con-full e-flex e-con e-parent\" data-id=\"c5d20e7\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e8bdddd elementor-bg-transform elementor-bg-transform-move-left elementor-cta--layout-image-left elementor-cta--mobile-layout-image-above elementor-cta--skin-classic elementor-animated-content elementor-widget elementor-widget-call-to-action\" data-id=\"e8bdddd\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"call-to-action.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-cta\">\n\t\t\t\t\t<div class=\"elementor-cta__bg-wrapper\">\n\t\t\t\t<div class=\"elementor-cta__bg elementor-bg\" style=\"background-image: url(https:\/\/learnbydoing.dev\/wp-content\/uploads\/2025\/06\/plan_navigation.webp);\" role=\"img\" aria-label=\"plan_navigation\"><\/div>\n\t\t\t\t<div class=\"elementor-cta__bg-overlay\"><\/div>\n\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-cta__content\">\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t<h2 class=\"elementor-cta__title elementor-cta__content-item elementor-content-item\">\n\t\t\t\t\t\tWant to learn more?\t\t\t\t\t<\/h2>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-cta__description elementor-cta__content-item elementor-content-item\">\n\t\t\t\t\t\tIf you want to learn how to design and build professional robotic systems leveraging the full power of ROS 2 Lifecycle Nodes, check out our \"Self Driving and ROS 2 - Learn by doing! Plan &amp; Navigation\" course\t\t\t\t\t<\/div>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-cta__button-wrapper elementor-cta__content-item elementor-content-item\">\n\t\t\t\t\t<a class=\"elementor-cta__button elementor-button elementor-size-\" href=\"\" target=\"_blank\">\n\t\t\t\t\t\tEnroll Now\t\t\t\t\t<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-ribbon elementor-ribbon-right\">\n\t\t\t\t<div class=\"elementor-ribbon-inner\">\n\t\t\t\t\tDISCOUNT\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>When developing complex robotic systems, managing the operational state of each node precisely is essential to ensure stability, safety, and predictability.ROS 2 introduces a key concept to meet this need: Lifecycle Nodes. \u00a0 Unlike standard nodes, which start operating as soon as they are launched, Lifecycle Nodes allow you to explicitly control their behavior through [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":4100,"comment_status":"closed","ping_status":"open","sticky":false,"template":"elementor_header_footer","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[45,43],"tags":[328,347,349,179,66,74,106,319,96,110,343,348,296,71,107,72,342,76,73],"class_list":["post-4323","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ros-2","category-tutorials","tag-antonio-brandi","tag-brandi","tag-costmaps","tag-lbd","tag-learn-by-doing","tag-linux","tag-mapping","tag-maps","tag-nav2","tag-navigation","tag-obstacle","tag-pc","tag-raspberry","tag-ros","tag-ros-2","tag-ros2","tag-static","tag-step-by-step","tag-ubuntu"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Creating and Managing a Lifecycle Node in ROS 2 with C++ - Learn by Doing!<\/title>\n<meta name=\"description\" content=\"Learn how to create and manage Lifecycle Nodes in ROS 2. 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