diff --git a/src/fsfw/pus/Service8FunctionManagement.h b/src/fsfw/pus/Service8FunctionManagement.h
index 0ec715b8..eb42ef44 100644
--- a/src/fsfw/pus/Service8FunctionManagement.h
+++ b/src/fsfw/pus/Service8FunctionManagement.h
@@ -1,6 +1,8 @@
 #ifndef FSFW_PUS_SERVICE8FUNCTIONMANAGEMENT_H_
 #define FSFW_PUS_SERVICE8FUNCTIONMANAGEMENT_H_
 
+#include <cstdint>
+
 #include "fsfw/action/ActionMessage.h"
 #include "fsfw/tmtcservices/CommandingServiceBase.h"
 
@@ -35,6 +37,13 @@ class Service8FunctionManagement : public CommandingServiceBase {
                              uint16_t commandTimeoutSeconds = 60);
   ~Service8FunctionManagement() override;
 
+  enum class Subservice : uint8_t {
+    //!< [EXPORT] : [COMMAND] Functional commanding
+    COMMAND_DIRECT_COMMANDING = 128,
+    //!< [EXPORT] : [REPLY] Data reply
+    REPLY_DIRECT_COMMANDING_DATA = 130,
+  };
+
  protected:
   /* CSB abstract functions implementation . See CSB documentation. */
   ReturnValue_t isValidSubservice(uint8_t subservice) override;
@@ -48,13 +57,6 @@ class Service8FunctionManagement : public CommandingServiceBase {
                             bool* isStep) override;
 
  private:
-  enum class Subservice {
-    //!< [EXPORT] : [COMMAND] Functional commanding
-    COMMAND_DIRECT_COMMANDING = 128,
-    //!< [EXPORT] : [REPLY] Data reply
-    REPLY_DIRECT_COMMANDING_DATA = 130,
-  };
-
   ReturnValue_t checkInterfaceAndAcquireMessageQueue(MessageQueueId_t* messageQueueToSet,
                                                      object_id_t* objectId);
   ReturnValue_t prepareDirectCommand(CommandMessage* message, const uint8_t* tcData,
diff --git a/src/fsfw/pus/servicepackets/Service8Packets.h b/src/fsfw/pus/servicepackets/Service8Packets.h
index 981ef439..52b7b63a 100644
--- a/src/fsfw/pus/servicepackets/Service8Packets.h
+++ b/src/fsfw/pus/servicepackets/Service8Packets.h
@@ -1,11 +1,14 @@
 #ifndef FSFW_PUS_SERVICEPACKETS_SERVICE8PACKETS_H_
 #define FSFW_PUS_SERVICEPACKETS_SERVICE8PACKETS_H_
 
+#include <cstdint>
+
 #include "../../action/ActionMessage.h"
 #include "../../objectmanager/SystemObjectIF.h"
+#include "../../returnvalues/returnvalue.h"
 #include "../../serialize/SerialBufferAdapter.h"
-#include "../../serialize/SerialFixedArrayListAdapter.h"
 #include "../../serialize/SerialLinkedListAdapter.h"
+#include "../../serialize/SerializeAdapter.h"
 #include "../../serialize/SerializeElement.h"
 
 /**
@@ -22,14 +25,41 @@ class DirectCommand
     parametersSize = size;
   }
 
+  DirectCommand() : parametersSize(0), parameterBuffer(nullptr) {}
+
   ActionId_t getActionId() const { return actionId; }
+  void setActionId(ActionId_t actionId) { this->actionId = actionId; }
 
   object_id_t getObjectId() const { return objectId; }
+  void setObjectId(object_id_t objectId) { this->objectId = objectId; }
 
   const uint8_t* getParameters() { return parameterBuffer; }
+  // The given pointer is not deallocated and must outlive the DirectCommand!
+  void setParameters(const uint8_t* parameters, uint32_t parametersSize) {
+    this->parameterBuffer = parameters;
+    this->parametersSize = parametersSize;
+  }
 
   uint32_t getParametersSize() const { return parametersSize; }
 
+  // ^SerializeIF
+  virtual ReturnValue_t serialize(uint8_t** buffer, size_t* size, size_t maxSize,
+                                  Endianness streamEndianness) const override {
+    auto const oldSize = *size;
+    auto result = SerializeAdapter::serialize(&objectId, buffer, size, maxSize, streamEndianness);
+    if (result != returnvalue::OK) return result;
+    result = SerializeAdapter::serialize(&actionId, buffer, size, maxSize - ((*size) - oldSize),
+                                         streamEndianness);
+    if (result != returnvalue::OK) return result;
+
+    auto remainingSize = maxSize - ((*size) - oldSize);
+    if (remainingSize < parametersSize) return returnvalue::FAILED;
+    memcpy(*buffer, parameterBuffer, parametersSize);
+    *size += parametersSize;
+
+    return returnvalue::OK;
+  }
+
  private:
   DirectCommand(const DirectCommand& command);
   object_id_t objectId = 0;