fixed bugs in com subsystem

mission/system/objects/ComSubsystem.cpp

@@ -28,9 +28,10 @@ ComSubsystem::ComSubsystem(object_id_t setObjectId, uint32_t maxNumberOfSequence
 
 void ComSubsystem::performChildOperation() {
   readEventQueue();
-  if (mode != COM_SEQUENCE_RX_ONLY.first) {
+  if (countdownActive) {
   	checkTransmitterCountdown();
   }
+  Subsystem::performChildOperation();
 }
 
 MessageQueueId_t ComSubsystem::getCommandQueue() const { return Subsystem::getCommandQueue(); }
@@ -112,10 +113,12 @@ void ComSubsystem::startTransition(Mode_t mode, Submode_t submode) {
   // disabled here
   if (mode == COM_SEQUENCE_RX_ONLY.first) {
     transmitterCountdown.timeOut();
+    countdownActive = false;
   } else if ((mode == COM_SEQUENCE_RX_AND_TX_DEFAULT_RATE.first) ||
              (mode == COM_SEQUENCE_RX_AND_TX_LOW_RATE.first) ||
              (mode == COM_SEQUENCE_RX_AND_TX_HIGH_RATE.first)) {
     transmitterCountdown.resetTimer();
+    countdownActive = true;
   }
   Subsystem::startTransition(mode, submode);
 }
@@ -170,5 +173,6 @@ void ComSubsystem::startRxAndTxDefaultSeq() {
 void ComSubsystem::checkTransmitterCountdown() {
   if (transmitterCountdown.hasTimedOut()) {
     startTransition(COM_SEQUENCE_RX_ONLY.first, SUBMODE_NONE);
+    countdownActive = false;
   }
 }