diff --git a/src/fsfw/osal/host/FixedTimeslotTask.cpp b/src/fsfw/osal/host/FixedTimeslotTask.cpp
index 931e6a220..198152412 100644
--- a/src/fsfw/osal/host/FixedTimeslotTask.cpp
+++ b/src/fsfw/osal/host/FixedTimeslotTask.cpp
@@ -74,8 +74,10 @@ ReturnValue_t FixedTimeslotTask::sleepFor(uint32_t ms) {
   return HasReturnvaluesIF::RETURN_OK;
 }
 
-[[noreturn]] void FixedTimeslotTask::taskFunctionality() {
-  pollingSeqTable.intializeSequenceAfterTaskCreation();
+void FixedTimeslotTask::taskFunctionality() {
+  ReturnValue_t result = pollingSeqTable.intializeSequenceAfterTaskCreation();
+  // Ignore returnvalue for now
+  static_cast<void>(result);
 
   // A local iterator for the Polling Sequence Table is created to
   // find the start time for the first entry.
diff --git a/src/fsfw/osal/host/FixedTimeslotTask.h b/src/fsfw/osal/host/FixedTimeslotTask.h
index d85ad34c5..2823f6242 100644
--- a/src/fsfw/osal/host/FixedTimeslotTask.h
+++ b/src/fsfw/osal/host/FixedTimeslotTask.h
@@ -93,7 +93,7 @@ class FixedTimeslotTask : public FixedTimeslotTaskBase {
    * the checkAndRestartPeriod system call blocks the task until the next
    *  period. On missing the deadline, the deadlineMissedFunction is executed.
    */
-  [[noreturn]] void taskFunctionality();
+  void taskFunctionality();
 
   static bool delayForInterval(chron_ms* previousWakeTimeMs, chron_ms interval);
 };
diff --git a/src/fsfw/tasks/FixedSlotSequence.cpp b/src/fsfw/tasks/FixedSlotSequence.cpp
index 62c0e99c8..9305b4416 100644
--- a/src/fsfw/tasks/FixedSlotSequence.cpp
+++ b/src/fsfw/tasks/FixedSlotSequence.cpp
@@ -29,7 +29,7 @@ void FixedSlotSequence::executeAndAdvance() {
 
 uint32_t FixedSlotSequence::getIntervalToNextSlotMs() {
   uint32_t oldTime;
-  SlotListIter slotListIter = current;
+  auto slotListIter = current;
   // Get the pollingTimeMs of the current slot object.
   oldTime = slotListIter->pollingTimeMs;
   // Advance to the next object.
@@ -51,7 +51,7 @@ uint32_t FixedSlotSequence::getIntervalToNextSlotMs() {
 
 uint32_t FixedSlotSequence::getIntervalToPreviousSlotMs() {
   uint32_t currentTime;
-  SlotListIter slotListIter = current;
+  auto slotListIter = current;
   // Get the pollingTimeMs of the current slot object.
   currentTime = slotListIter->pollingTimeMs;
 
@@ -67,7 +67,7 @@ uint32_t FixedSlotSequence::getIntervalToPreviousSlotMs() {
 
 bool FixedSlotSequence::slotFollowsImmediately() {
   uint32_t currentTime = current->pollingTimeMs;
-  SlotListIter fixedSequenceIter = this->current;
+  auto fixedSequenceIter = this->current;
   // Get the pollingTimeMs of the current slot object.
   if (fixedSequenceIter == slotList.begin()) return false;
   fixedSequenceIter--;
@@ -96,8 +96,8 @@ ReturnValue_t FixedSlotSequence::checkSequence() const {
     return FixedTimeslotTaskIF::SLOT_LIST_EMPTY;
   }
 
-  if (customCheckFunction != nullptr) {
-    ReturnValue_t result = customCheckFunction(slotList);
+  if (customChecker != nullptr) {
+    ReturnValue_t result = customChecker(slotList, customCheckArgs);
     if (result != HasReturnvaluesIF::RETURN_OK) {
       // Continue for now but print error output.
 #if FSFW_CPP_OSTREAM_ENABLED == 1
@@ -161,8 +161,9 @@ ReturnValue_t FixedSlotSequence::intializeSequenceAfterTaskCreation() const {
   return HasReturnvaluesIF::RETURN_OK;
 }
 
-void FixedSlotSequence::addCustomCheck(ReturnValue_t (*customCheckFunction)(const SlotList&)) {
-  this->customCheckFunction = customCheckFunction;
+void FixedSlotSequence::addCustomCheck(CustomCheckFunc customChecker_, void* checkerArgs_) {
+  customChecker = customChecker_;
+  customCheckArgs = checkerArgs_;
 }
 
 bool FixedSlotSequence::isEmpty() const { return slotList.empty(); }
diff --git a/src/fsfw/tasks/FixedSlotSequence.h b/src/fsfw/tasks/FixedSlotSequence.h
index 838963c1c..2e38ee4b4 100644
--- a/src/fsfw/tasks/FixedSlotSequence.h
+++ b/src/fsfw/tasks/FixedSlotSequence.h
@@ -30,7 +30,7 @@ class FixedSlotSequence {
  public:
   using SlotList = std::multiset<FixedSequenceSlot>;
   using SlotListIter = std::multiset<FixedSequenceSlot>::iterator;
-
+  using CustomCheckFunc = ReturnValue_t (*)(const SlotList&, void* args);
   /**
    * @brief	The constructor of the FixedSlotSequence object.
    * @param	setLength	The period length, expressed in ms.
@@ -106,7 +106,7 @@ class FixedSlotSequence {
   /**
    * @brief	This method returns the length of this FixedSlotSequence instance.
    */
-  uint32_t getLengthMs() const;
+  [[nodiscard]] uint32_t getLengthMs() const;
 
   /**
    * @brief	The method to execute the device handler entered in the current
@@ -137,7 +137,7 @@ class FixedSlotSequence {
    * @return
    *  - SLOT_LIST_EMPTY if the slot list is empty
    */
-  ReturnValue_t checkSequence() const;
+  [[nodiscard]] ReturnValue_t checkSequence() const;
 
   /**
    * @brief   A custom check can be injected for the respective slot list.
@@ -149,7 +149,7 @@ class FixedSlotSequence {
    * @param customCheckFunction
    *
    */
-  void addCustomCheck(ReturnValue_t (*customCheckFunction)(const SlotList&));
+  void addCustomCheck(CustomCheckFunc func, void* userArgs);
 
   /**
    * @brief 	Perform any initialization steps required after the executing
@@ -157,9 +157,9 @@ class FixedSlotSequence {
    * 			executing task!
    * @return
    */
-  ReturnValue_t intializeSequenceAfterTaskCreation() const;
+  [[nodiscard]] ReturnValue_t intializeSequenceAfterTaskCreation() const;
 
-  bool isEmpty() const;
+  [[nodiscard]] bool isEmpty() const;
 
  protected:
   /**
@@ -175,7 +175,8 @@ class FixedSlotSequence {
    */
   SlotList slotList;
 
-  ReturnValue_t (*customCheckFunction)(const SlotList&) = nullptr;
+  CustomCheckFunc customChecker = nullptr;
+  void* customCheckArgs = nullptr;
 
   uint32_t lengthMs;
 };