fix(opcua,#386): use rcutils logging API for Humble compat

``rclcpp::Logger::get_effective_level`` was added in Jazzy; Humble
``Unit tests (humble)`` job on PR #387 fails with ``'class rclcpp::Logger'
has no member named 'get_effective_level'`` against Jazzy+ headers.

Switch the three pre-gate helpers (``client_debug_enabled``,
``poller_debug_enabled``, ``plugin_debug_enabled``) to
``rcutils_logging_logger_is_enabled_for(name, severity)``, which is
present in rcutils on Humble through Rolling. Functionally identical
- the rclcpp method is just a thin wrapper around the rcutils call.

Add ``<rcutils/logging.h>`` include to all three .cpp files. No public
API change; named loggers (``opcua.client`` / ``opcua.poller`` /
``opcua.plugin``) and DEBUG behaviour stay identical.

Local verify (Jazzy): 27/27 test_opcua_client. Humble CI gate is the
proof.

Author: mfaferek93

src/ros2_medkit_plugins/ros2_medkit_opcua/src/opcua_client.cpp

@@ -27,6 +27,7 @@
 #include <open62541/client_subscriptions.h>
 #include <open62541/types.h>
 #include <rclcpp/logging.hpp>
+#include <rcutils/logging.h>
 
 namespace ros2_medkit_gateway {
 
@@ -43,10 +44,10 @@ inline rclcpp::Logger opcua_client_logger() {
 // Pre-gate for traces whose stream-build cost is non-trivial (e.g. per-arg
 // loops). RCLCPP_DEBUG_STREAM constructs the std::stringstream
 // unconditionally, so for hot paths we check the effective level first.
-// ``Level`` is an enum class - cast to int for the ordered comparison.
+// Uses the rcutils-level API (available in Humble through Rolling) instead
+// of rclcpp::Logger::get_effective_level (Jazzy+ only).
 inline bool client_debug_enabled() {
-  return static_cast<int>(opcua_client_logger().get_effective_level()) <=
-         static_cast<int>(rclcpp::Logger::Level::Debug);
+  return rcutils_logging_logger_is_enabled_for("opcua.client", RCUTILS_LOG_SEVERITY_DEBUG);
 }
 }  // namespace
 

src/ros2_medkit_plugins/ros2_medkit_opcua/src/opcua_plugin.cpp

@@ -15,6 +15,7 @@
 #include "ros2_medkit_opcua/opcua_plugin.hpp"
 
 #include <rclcpp/rclcpp.hpp>
+#include <rcutils/logging.h>
 #include <ros2_medkit_msgs/msg/fault.hpp>
 #include <ros2_medkit_msgs/srv/clear_fault.hpp>
 #include <ros2_medkit_msgs/srv/report_fault.hpp>
@@ -42,8 +43,9 @@ inline rclcpp::Logger opcua_plugin_logger() {
 }
 
 inline bool plugin_debug_enabled() {
-  return static_cast<int>(opcua_plugin_logger().get_effective_level()) <=
-         static_cast<int>(rclcpp::Logger::Level::Debug);
+  // rcutils API for Humble compatibility; Jazzy+ adds rclcpp::Logger::
+  // get_effective_level but Humble does not.
+  return rcutils_logging_logger_is_enabled_for("opcua.plugin", RCUTILS_LOG_SEVERITY_DEBUG);
 }
 
 /// Parse a JSON "value" field, coerce to the node's declared data_type, and

src/ros2_medkit_plugins/ros2_medkit_opcua/src/opcua_poller.cpp

@@ -24,6 +24,7 @@
 
 #include <open62541/types.h>
 #include <rclcpp/logging.hpp>
+#include <rcutils/logging.h>
 
 namespace ros2_medkit_gateway {
 
@@ -34,8 +35,9 @@ inline rclcpp::Logger opcua_poller_logger() {
 }
 
 inline bool poller_debug_enabled() {
-  return static_cast<int>(opcua_poller_logger().get_effective_level()) <=
-         static_cast<int>(rclcpp::Logger::Level::Debug);
+  // rcutils API for Humble compatibility; Jazzy+ adds rclcpp::Logger::
+  // get_effective_level but Humble does not.
+  return rcutils_logging_logger_is_enabled_for("opcua.poller", RCUTILS_LOG_SEVERITY_DEBUG);
 }
 }  // namespace