diff --git a/fsfw b/fsfw
index b52f1925..7b6f68c5 160000
--- a/fsfw
+++ b/fsfw
@@ -1 +1 @@
-Subproject commit b52f19254b8072a32203eaab91ea3c65b513ba7e
+Subproject commit 7b6f68c509e9849473af77db5599f1a2b742c070
diff --git a/mission/devices/HeaterHandler.cpp b/mission/devices/HeaterHandler.cpp
index 255ba6ec..ed62840b 100644
--- a/mission/devices/HeaterHandler.cpp
+++ b/mission/devices/HeaterHandler.cpp
@@ -134,7 +134,7 @@ ReturnValue_t HeaterHandler::executeAction(ActionId_t actionId, MessageQueueId_t
   return result;
 }
 
-void HeaterHandler::sendSwitchCommand(uint8_t switchNr, ReturnValue_t onOff) const {
+ReturnValue_t HeaterHandler::sendSwitchCommand(uint8_t switchNr, ReturnValue_t onOff) {
   ReturnValue_t result;
   store_address_t storeAddress;
   uint8_t commandData[2];
@@ -164,6 +164,7 @@ void HeaterHandler::sendSwitchCommand(uint8_t switchNr, ReturnValue_t onOff) con
                  << "message" << std::endl;
     }
   }
+  return result;
 }
 
 void HeaterHandler::handleActiveCommands() {
@@ -338,7 +339,9 @@ gpioId_t HeaterHandler::getGpioIdFromSwitchNr(int switchNr) {
 
 MessageQueueId_t HeaterHandler::getCommandQueue() const { return commandQueue->getId(); }
 
-void HeaterHandler::sendFuseOnCommand(uint8_t fuseNr) const {}
+ReturnValue_t HeaterHandler::sendFuseOnCommand(uint8_t fuseNr) {
+  return RETURN_OK;
+}
 
 ReturnValue_t HeaterHandler::getSwitchState(uint8_t switchNr) const { return 0; }
 
diff --git a/mission/devices/HeaterHandler.h b/mission/devices/HeaterHandler.h
index 2a8ce555..18b821ec 100644
--- a/mission/devices/HeaterHandler.h
+++ b/mission/devices/HeaterHandler.h
@@ -43,8 +43,8 @@ class HeaterHandler : public ExecutableObjectIF,
 
   virtual ReturnValue_t performOperation(uint8_t operationCode = 0) override;
 
-  virtual void sendSwitchCommand(uint8_t switchNr, ReturnValue_t onOff) const override;
-  virtual void sendFuseOnCommand(uint8_t fuseNr) const override;
+  virtual ReturnValue_t sendSwitchCommand(uint8_t switchNr, ReturnValue_t onOff) override;
+  virtual ReturnValue_t sendFuseOnCommand(uint8_t fuseNr) override;
   /**
    * @brief	This function will be called from the Heater object to check
    * 			the current switch state.
diff --git a/mission/devices/PCDUHandler.cpp b/mission/devices/PCDUHandler.cpp
index 2f91c140..fa8f3c91 100644
--- a/mission/devices/PCDUHandler.cpp
+++ b/mission/devices/PCDUHandler.cpp
@@ -205,7 +205,7 @@ void PCDUHandler::updatePdu1SwitchStates() {
 
 LocalDataPoolManager* PCDUHandler::getHkManagerHandle() { return &poolManager; }
 
-void PCDUHandler::sendSwitchCommand(uint8_t switchNr, ReturnValue_t onOff) const {
+ReturnValue_t PCDUHandler::sendSwitchCommand(uint8_t switchNr, ReturnValue_t onOff) {
   using namespace pcduSwitches;
   ReturnValue_t result;
   uint16_t memoryAddress = 0;
@@ -261,7 +261,7 @@ void PCDUHandler::sendSwitchCommand(uint8_t switchNr, ReturnValue_t onOff) const
     }
     // This is a dangerous command. Reject/Igore it for now
     case pcduSwitches::PDU2_CH0_Q7S: {
-      return;
+      return RETURN_FAILED;
       // memoryAddress = PDU2::CONFIG_ADDRESS_OUT_EN_Q7S;
       // pdu = ObjectManager::instance()->get<GomspaceDeviceHandler>(objects::PDU2_HANDLER);
       // break;
@@ -309,7 +309,7 @@ void PCDUHandler::sendSwitchCommand(uint8_t switchNr, ReturnValue_t onOff) const
 
     default: {
       sif::error << "PCDUHandler::sendSwitchCommand: Invalid switch number " << std::endl;
-      return;
+      return RETURN_FAILED;
     }
   }
 
@@ -322,7 +322,7 @@ void PCDUHandler::sendSwitchCommand(uint8_t switchNr, ReturnValue_t onOff) const
       break;
     default:
       sif::error << "PCDUHandler::sendSwitchCommand: Invalid state commanded" << std::endl;
-      return;
+      return RETURN_FAILED;
   }
 
   GomspaceSetParamMessage setParamMessage(memoryAddress, &parameterValue, parameterValueSize);
@@ -347,9 +347,12 @@ void PCDUHandler::sendSwitchCommand(uint8_t switchNr, ReturnValue_t onOff) const
     // Can't use trigger event because of const function constraint, but this hack seems to work
     this->forwardEvent(power::SWITCH_CMD_SENT, parameterValue, switchNr);
   }
+  return result;
 }
 
-void PCDUHandler::sendFuseOnCommand(uint8_t fuseNr) const {}
+ReturnValue_t PCDUHandler::sendFuseOnCommand(uint8_t fuseNr) {
+  return RETURN_OK;
+}
 
 ReturnValue_t PCDUHandler::getSwitchState(uint8_t switchNr) const {
   if (switchNr >= pcduSwitches::NUMBER_OF_SWITCHES) {
diff --git a/mission/devices/PCDUHandler.h b/mission/devices/PCDUHandler.h
index 3d014205..c44052bb 100644
--- a/mission/devices/PCDUHandler.h
+++ b/mission/devices/PCDUHandler.h
@@ -33,8 +33,8 @@ class PCDUHandler : public PowerSwitchIF,
                                     store_address_t storeId = storeId::INVALID_STORE_ADDRESS,
                                     bool* clearMessage = nullptr) override;
 
-  virtual void sendSwitchCommand(uint8_t switchNr, ReturnValue_t onOff) const override;
-  virtual void sendFuseOnCommand(uint8_t fuseNr) const override;
+  virtual ReturnValue_t sendSwitchCommand(uint8_t switchNr, ReturnValue_t onOff) override;
+  virtual ReturnValue_t sendFuseOnCommand(uint8_t fuseNr) override;
   virtual ReturnValue_t getSwitchState(uint8_t switchNr) const override;
   virtual ReturnValue_t getFuseState(uint8_t fuseNr) const override;
   virtual uint32_t getSwitchDelayMs(void) const override;
diff --git a/tmtc b/tmtc
index 6db0a2cb..e13bb402 160000
--- a/tmtc
+++ b/tmtc
@@ -1 +1 @@
-Subproject commit 6db0a2cb791909a69506ed56df5518c277ece275
+Subproject commit e13bb402a2780142cc1b3b56c2873a4cbcf12a3b