this seems to work

src/fsfw/controller/ControllerBase.cpp

@@ -4,11 +4,10 @@
 #include "fsfw/ipc/QueueFactory.h"
 #include "fsfw/objectmanager/ObjectManager.h"
 #include "fsfw/subsystem/SubsystemBase.h"
+#include "fsfw/subsystem/helper.h"
 
-ControllerBase::ControllerBase(object_id_t setObjectId, object_id_t parentId,
-                               size_t commandQueueDepth)
+ControllerBase::ControllerBase(object_id_t setObjectId, size_t commandQueueDepth)
     : SystemObject(setObjectId),
-      parentId(parentId),
       mode(MODE_OFF),
       submode(SUBMODE_NONE),
       modeHelper(this),
@@ -25,28 +24,6 @@ ReturnValue_t ControllerBase::initialize() {
   if (result != returnvalue::OK) {
     return result;
   }
-
-  MessageQueueId_t parentQueue = 0;
-  if (parentId != objects::NO_OBJECT) {
-    auto* parent = ObjectManager::instance()->get<SubsystemBase>(parentId);
-    if (parent == nullptr) {
-      return returnvalue::FAILED;
-    }
-    parentQueue = parent->getCommandQueue();
-
-    parent->registerChild(getObjectId());
-  }
-
-  result = healthHelper.initialize(parentQueue);
-  if (result != returnvalue::OK) {
-    return result;
-  }
-
-  result = modeHelper.initialize(parentQueue);
-  if (result != returnvalue::OK) {
-    return result;
-  }
-
   return returnvalue::OK;
 }
 
@@ -120,3 +97,12 @@ void ControllerBase::setTaskIF(PeriodicTaskIF* task_) { executingTask = task_; }
 void ControllerBase::changeHK(Mode_t mode_, Submode_t submode_, bool enable) {}
 
 ReturnValue_t ControllerBase::initializeAfterTaskCreation() { return returnvalue::OK; }
+
+const HasHealthIF* ControllerBase::getOptHealthIF() const { return this; }
+
+const HasModesIF& ControllerBase::getModeIF() const { return *this; }
+
+ReturnValue_t ControllerBase::connectModeTreeParent(HasModeTreeChildrenIF& parent,
+                                                    const ModeTreeChildIF& child) {
+  return modetree::connectModeTreeParent(parent, child, healthHelper, modeHelper);
+}

src/fsfw/controller/ControllerBase.h

@@ -6,6 +6,9 @@
 #include "fsfw/modes/HasModesIF.h"
 #include "fsfw/modes/ModeHelper.h"
 #include "fsfw/objectmanager/SystemObject.h"
+#include "fsfw/subsystem/HasModeTreeChildrenIF.h"
+#include "fsfw/subsystem/ModeTreeChildIF.h"
+#include "fsfw/subsystem/modes/ModeTreeConnectionIF.h"
 #include "fsfw/tasks/ExecutableObjectIF.h"
 #include "fsfw/tasks/PeriodicTaskIF.h"
 
@@ -18,13 +21,18 @@
 class ControllerBase : public HasModesIF,
                        public HasHealthIF,
                        public ExecutableObjectIF,
+                       public ModeTreeChildIF,
+                       public ModeTreeConnectionIF,
                        public SystemObject {
  public:
   static const Mode_t MODE_NORMAL = 2;
 
-  ControllerBase(object_id_t setObjectId, object_id_t parentId, size_t commandQueueDepth = 3);
+  ControllerBase(object_id_t setObjectId, size_t commandQueueDepth = 3);
   ~ControllerBase() override;
 
+  ReturnValue_t connectModeTreeParent(HasModeTreeChildrenIF &parent,
+                                      const ModeTreeChildIF &child) override;
+
   /** SystemObject override */
   ReturnValue_t initialize() override;
 
@@ -38,6 +46,8 @@ class ControllerBase : public HasModesIF,
   ReturnValue_t performOperation(uint8_t opCode) override;
   void setTaskIF(PeriodicTaskIF *task) override;
   ReturnValue_t initializeAfterTaskCreation() override;
+  const HasHealthIF *getOptHealthIF() const override;
+  const HasModesIF &getModeIF() const override;
 
  protected:
   /**
@@ -56,8 +66,6 @@ class ControllerBase : public HasModesIF,
   ReturnValue_t checkModeCommand(Mode_t mode, Submode_t submode,
                                  uint32_t *msToReachTheMode) override = 0;
 
-  const object_id_t parentId;
-
   Mode_t mode;
 
   Submode_t submode;

src/fsfw/controller/ExtendedControllerBase.cpp

@@ -1,8 +1,7 @@
 #include "fsfw/controller/ExtendedControllerBase.h"
 
-ExtendedControllerBase::ExtendedControllerBase(object_id_t objectId, object_id_t parentId,
-                                               size_t commandQueueDepth)
-    : ControllerBase(objectId, parentId, commandQueueDepth),
+ExtendedControllerBase::ExtendedControllerBase(object_id_t objectId, size_t commandQueueDepth)
+    : ControllerBase(objectId, commandQueueDepth),
       poolManager(this, commandQueue),
       actionHelper(this, commandQueue) {}
 

src/fsfw/controller/ExtendedControllerBase.h

@@ -17,7 +17,7 @@ class ExtendedControllerBase : public ControllerBase,
                                public HasActionsIF,
                                public HasLocalDataPoolIF {
  public:
-  ExtendedControllerBase(object_id_t objectId, object_id_t parentId, size_t commandQueueDepth = 3);
+  ExtendedControllerBase(object_id_t objectId, size_t commandQueueDepth = 3);
   ~ExtendedControllerBase() override;
 
   /* SystemObjectIF overrides */

src/fsfw/subsystem/CMakeLists.txt

@@ -1,3 +1,4 @@
-target_sources(${LIB_FSFW_NAME} PRIVATE Subsystem.cpp SubsystemBase.cpp)
+target_sources(${LIB_FSFW_NAME} PRIVATE Subsystem.cpp SubsystemBase.cpp
+                                        helper.cpp)
 
 add_subdirectory(modes)

src/fsfw/subsystem/HasModeTreeChildrenIF.h

@@ -0,0 +1,13 @@
+#ifndef FSFW_SUBSYSTEM_HASMODETREECHILDRENIF_H_
+#define FSFW_SUBSYSTEM_HASMODETREECHILDRENIF_H_
+
+#include "ModeTreeChildIF.h"
+
+class HasModeTreeChildrenIF {
+ public:
+  virtual ~HasModeTreeChildrenIF() = default;
+  virtual ReturnValue_t registerChild(const ModeTreeChildIF& child) = 0;
+  virtual MessageQueueId_t getCommandQueue() const = 0;
+};
+
+#endif  // FSFW_SUBSYSTEM_HASMODETREECHILDRENIF_H_

src/fsfw/subsystem/ModeTreeChildIF.h

@@ -0,0 +1,15 @@
+#ifndef FSFW_SUBSYSTEM_MODETREECHILDIF_H_
+#define FSFW_SUBSYSTEM_MODETREECHILDIF_H_
+
+#include <fsfw/health/HasHealthIF.h>
+#include <fsfw/modes/HasModesIF.h>
+
+class ModeTreeChildIF {
+ public:
+  virtual ~ModeTreeChildIF() = default;
+  virtual object_id_t getObjectId() const = 0;
+  virtual const HasHealthIF* getOptHealthIF() const = 0;
+  virtual const HasModesIF& getModeIF() const = 0;
+};
+
+#endif /* FSFW_SUBSYSTEM_MODETREECHILDIF_H_ */

src/fsfw/subsystem/SubsystemBase.cpp

@@ -334,3 +334,20 @@ ReturnValue_t SubsystemBase::setHealth(HealthState health) {
 HasHealthIF::HealthState SubsystemBase::getHealth() { return healthHelper.getHealth(); }
 
 void SubsystemBase::modeChanged() {}
+
+ReturnValue_t SubsystemBase::registerChild(const ModeTreeChildIF& child) {
+  ChildInfo info;
+
+  const HasModesIF& modeChild = child.getModeIF();
+  // intentional to force an initial command during system startup
+  info.commandQueue = modeChild.getCommandQueue();
+  info.mode = HasModesIF::MODE_UNDEFINED;
+  info.submode = SUBMODE_NONE;
+  info.healthChanged = false;
+
+  auto resultPair = childrenMap.emplace(child.getObjectId(), info);
+  if (not resultPair.second) {
+    return COULD_NOT_INSERT_CHILD;
+  }
+  return returnvalue::OK;
+}

src/fsfw/subsystem/SubsystemBase.h

@@ -3,14 +3,15 @@
 
 #include <map>
 
-#include "../container/HybridIterator.h"
-#include "../health/HasHealthIF.h"
-#include "../health/HealthHelper.h"
-#include "../ipc/MessageQueueIF.h"
-#include "../modes/HasModesIF.h"
-#include "../objectmanager/SystemObject.h"
-#include "../returnvalues/returnvalue.h"
-#include "../tasks/ExecutableObjectIF.h"
+#include "fsfw/container/HybridIterator.h"
+#include "fsfw/health/HasHealthIF.h"
+#include "fsfw/health/HealthHelper.h"
+#include "fsfw/ipc/MessageQueueIF.h"
+#include "fsfw/modes/HasModesIF.h"
+#include "fsfw/objectmanager/SystemObject.h"
+#include "fsfw/returnvalues/returnvalue.h"
+#include "fsfw/subsystem/HasModeTreeChildrenIF.h"
+#include "fsfw/tasks/ExecutableObjectIF.h"
 #include "modes/HasModeSequenceIF.h"
 
 /**
@@ -27,6 +28,7 @@
 class SubsystemBase : public SystemObject,
                       public HasModesIF,
                       public HasHealthIF,
+                      public HasModeTreeChildrenIF,
                       public ExecutableObjectIF {
  public:
   static const uint8_t INTERFACE_ID = CLASS_ID::SUBSYSTEM_BASE;
@@ -129,6 +131,8 @@ class SubsystemBase : public SystemObject,
 
   virtual void performChildOperation() = 0;
 
+  ReturnValue_t registerChild(const ModeTreeChildIF &child) override;
+
   virtual ReturnValue_t checkModeCommand(Mode_t mode, Submode_t submode,
                                          uint32_t *msToReachTheMode) override = 0;
 

src/fsfw/subsystem/helper.cpp

@@ -0,0 +1,13 @@
+#include "helper.h"
+
+ReturnValue_t modetree::connectModeTreeParent(HasModeTreeChildrenIF& parent,
+                                              const ModeTreeChildIF& child,
+                                              HealthHelper& healthHelper, ModeHelper& modeHelper) {
+  ReturnValue_t result = parent.registerChild(child);
+  if (result != returnvalue::OK) {
+    return result;
+  }
+  healthHelper.setParentQueue(parent.getCommandQueue());
+  modeHelper.setParentQueue(parent.getCommandQueue());
+  return returnvalue::OK;
+}

src/fsfw/subsystem/helper.h

@@ -0,0 +1,14 @@
+#ifndef FSFW_SUBSYSTEM_HELPER_H_
+#define FSFW_SUBSYSTEM_HELPER_H_
+
+#include "HasModeTreeChildrenIF.h"
+#include "fsfw/health/HealthHelper.h"
+
+namespace modetree {
+
+ReturnValue_t connectModeTreeParent(HasModeTreeChildrenIF& parent, const ModeTreeChildIF& child,
+                                    HealthHelper& healthHelper, ModeHelper& modeHelper);
+
+}
+
+#endif /* FSFW_SRC_FSFW_SUBSYSTEM_HELPER_H_ */

src/fsfw/subsystem/modes/ModeTreeConnectionIF.h

@@ -0,0 +1,13 @@
+#ifndef FSFW_SUBSYSTEM_MODES_MODETREECONNECTIONIF_H_
+#define FSFW_SUBSYSTEM_MODES_MODETREECONNECTIONIF_H_
+
+#include "fsfw/subsystem/HasModeTreeChildrenIF.h"
+
+class ModeTreeConnectionIF {
+ public:
+  virtual ~ModeTreeConnectionIF() = default;
+  virtual ReturnValue_t connectModeTreeParent(HasModeTreeChildrenIF &parent,
+                                              const ModeTreeChildIF &child) = 0;
+};
+
+#endif /* FSFW_SRC_FSFW_SUBSYSTEM_MODES_MODETREECONNECTIONIF_H_ */

src/fsfw_tests/integration/controller/TestController.cpp

@@ -4,8 +4,8 @@
 #include <fsfw/objectmanager/ObjectManager.h>
 #include <fsfw/serviceinterface/ServiceInterface.h>
 
-TestController::TestController(object_id_t objectId, object_id_t parentId, size_t commandQueueDepth)
-    : ExtendedControllerBase(objectId, parentId, commandQueueDepth) {}
+TestController::TestController(object_id_t objectId, size_t commandQueueDepth)
+    : ExtendedControllerBase(objectId, commandQueueDepth) {}
 
 TestController::~TestController() {}
 

src/fsfw_tests/integration/controller/TestController.h

@@ -7,7 +7,7 @@
 
 class TestController : public ExtendedControllerBase {
  public:
-  TestController(object_id_t objectId, object_id_t parentId, size_t commandQueueDepth = 10);
+  TestController(object_id_t objectId, size_t commandQueueDepth = 10);
   virtual ~TestController();
 
  protected: