Implement CRC in dummy

Removes need for call to_upper() which would also cause trouble because
the CRC values would not match if the string is modified after
caluclating the CRC

Implements #6654

tests/src/TecDummy.cc

@@ -3,7 +3,7 @@
 
 #include <tec/TecFrame.h>
 
-#include <boost/algorithm/string.hpp>
+#include <boost/crc.hpp>
 #include <sstream>
 
 TecDummy::BackendRegisterer TecDummy::backendRegisterer;
@@ -49,7 +49,6 @@ void TecDummy::read(uint8_t bar, uint32_t address, int32_t* data, size_t sizeInB
 
     // perform data processing
     auto frameReply = processFrame(frameData);
-    boost::to_upper(frameReply);
 
     // append to answer
     frameReply += "\r";
@@ -117,8 +116,16 @@ std::map<TecDummy::TecFramePart, std::string> TecDummy::splitFrame(const std::st
   return result;
 }
 
-std::string TecDummy::getCrc(std::string&) {
-  return std::string{"DEAD"};
+std::string TecDummy::getCrc(std::string& data) {
+  // CRC-16 CCITT, but with initial value 0 instead of 0xFFFF
+  boost::crc_ccitt_type crc{0};
+
+  crc.process_bytes(data.c_str(), data.length());
+
+  std::stringstream ss;
+  ss << std::hex << std::setw(4) << std::setfill('0') << std::uppercase << crc.checksum();
+
+  return ss.str();
 }
 
 std::string TecDummy::processFrame(const std::string& command) {
@@ -146,7 +153,7 @@ std::string TecDummy::processFrame(const std::string& command) {
     parameterId = std::stoul("0x" + parsedFrame[TecFramePart::PARAMETER_ID], 0, 16);
     result = "!" + parsedFrame[TecFramePart::ADDRESS] + parsedFrame[TecFramePart::SEQUENCE];
     std::stringstream ss;
-    ss << std::hex << std::setw(8) << std::setfill('0') << rawValues[static_cast<TecFrame::TecParameter>(parameterId)];
+    ss << std::hex << std::setw(8) << std::setfill('0') << std::uppercase << rawValues[static_cast<TecFrame::TecParameter>(parameterId)];
     result += ss.str();
     result += getCrc(result);
   }