dummy: Implement read requests

Implements #6523

tests/src/TecDummy.cc

@@ -134,6 +134,14 @@ std::string TecDummy::processFrame(const std::string& command) {
     result = "!" + parsedFrame[TecFramePart::ADDRESS] + parsedFrame[TecFramePart::SEQUENCE];
     result += getCrc(result);
   }
+  else if(parsedFrame[TecFramePart::COMMAND] == "?VR") {
+    uint32_t 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)];
+    result += ss.str();
+    result += getCrc(result);
+  }
 
   std::cout << "Returning result " << result << std::endl;