TecDummy: Correct byte order for timeout marker

tests/src/TecDummy.cc

@@ -22,11 +22,10 @@ void TecDummy::read(uint8_t bar, uint32_t address, int32_t* data, size_t sizeInB
 
   if(bar != TecDummy_bar || address != TecDummy_address_loopDone) return;
   if(reg_loopStart != 1) return;
-  if (loopDoneDelay) {
+  if(loopDoneDelay) {
     loopDoneDelay--;
     return;
   }
-  
 
   // convert command into string
   // FIXME: this can be done better if the DummyRegisterRawAccessor would allow us to use the raw pointer to this...
@@ -53,13 +52,16 @@ void TecDummy::read(uint8_t bar, uint32_t address, int32_t* data, size_t sizeInB
     frameData.erase(endOfFrame);
 
     std::string frameReply{""};
-    if(!simulateSerialTimeout){
+    if(!simulateSerialTimeout) {
       // perform data processing
       frameReply = processFrame(frameData);
     }
-    else{
+    else {
       // In case of timeout, the marker is written to the start of the frame
-      const uint32_t timeoutMarker{TEC_TIMEOUT};
+      // The byte order is swapped here to compensate swapping of the reg_command,
+      // this is neccessary, because the TEC lib checks the timeout marker before
+      // changing the byte order of the received frame.
+      const uint32_t timeoutMarker{htonl(TEC_TIMEOUT)};
       frameReply = std::string(sizeof(uint32_t), '\0');
       std::memcpy(&(frameReply[0]), &timeoutMarker, sizeof(uint32_t));
     }
@@ -68,7 +70,6 @@ void TecDummy::read(uint8_t bar, uint32_t address, int32_t* data, size_t sizeInB
     frameReply += "\r";
     frameReply += std::string(frameLength - frameReply.size(), '\0');
     reply += frameReply;
-
   }
   assert(reply.size() == nFrames * frameLength);
 
@@ -78,7 +79,6 @@ void TecDummy::read(uint8_t bar, uint32_t address, int32_t* data, size_t sizeInB
     std::memcpy(&word, &(reply[4 * i]), 4);
     reg_command[i] = htonl(word);
   }
-
   *data = 1;
 }
 
@@ -165,7 +165,8 @@ std::string TecDummy::processFrame(const std::string& command) {
     // Handle store command
     int32_t value = std::stol("0x" + parsedFrame[TecFramePart::PAYLOAD], nullptr, 16);
 
-    std::cout << "Storing raw value " << value << "(" << parsedFrame[TecFramePart::PAYLOAD] << ") for parameter " << parameterId << std::endl;
+    std::cout << "Storing raw value " << value << "(" << parsedFrame[TecFramePart::PAYLOAD] << ") for parameter "
+              << parameterId << std::endl;
 
     rawValues[parameterId] = value;
     result = "!" + parsedFrame[TecFramePart::ADDRESS] + parsedFrame[TecFramePart::SEQUENCE];