Fixing subtree issues with blackboard shared resources (3640) (ros-navigation#3911)

* fixing subtree issues

* Update bt_action_server_impl.hpp

Author: SteveMacenski

nav2_behavior_tree/include/nav2_behavior_tree/bt_action_server_impl.hpp

@@ -231,6 +231,11 @@ bool BtActionServer<ActionT>::loadBehaviorTree(const std::string & bt_xml_filena
   // Create the Behavior Tree from the XML input
   try {
     tree_ = bt_->createTreeFromFile(filename, blackboard_);
+    for (auto & blackboard : tree_.blackboard_stack) {
+      blackboard->set<rclcpp::Node::SharedPtr>("node", client_node_);
+      blackboard->set<std::chrono::milliseconds>("server_timeout", default_server_timeout_);
+      blackboard->set<std::chrono::milliseconds>("bt_loop_duration", bt_loop_duration_);
+    }
   } catch (const std::exception & e) {
     RCLCPP_ERROR(logger_, "Exception when loading BT: %s", e.what());
     return false;