Add quote in DOXYGEN_VERSION_NUMBER and revert config.doxyfile change

Author: ActoryOu

.github/workflows/release.yml

@@ -219,11 +219,11 @@ jobs:
           cd zip-check/${{ env.repository_compressed_name }}/"$REPO_NAME"
 
           # find "PROJECT_NUMBER = <version_number>"
-          export DOXYGEN_VERSION_NUMBER=$(grep -x "[ ]*PROJECT_NUMBER[ ]*=[ ]*[^ ]*[ ]*" docs/doxygen/config.doxyfile | awk -F= '{gsub(" ","",$2); print $2 }');
+          DOXYGEN_VERSION_NUMBER=$(grep -x "[ ]*PROJECT_NUMBER[ ]*=[ ]*[^ ]*[ ]*" docs/doxygen/config.doxyfile | awk -F= '{gsub(" ","",$2); print $2 }');
 
           # compare the <version_number> with input version number
           echo "Comparing $DOXYGEN_VERSION_NUMBER & $VERSION_NUMBER"
-          [[ $DOXYGEN_VERSION_NUMBER == $VERSION_NUMBER ]] \
+          [[ '$DOXYGEN_VERSION_NUMBER' == $VERSION_NUMBER ]] \
           && echo "config.doxyfile : match $VERSION_NUMBER" \
           || { echo "config.doxyfile : $DOXYGEN_VERSION_NUMBER doesn't match $VERSION_NUMBER"; exit 255; }
 

docs/doxygen/config.doxyfile

@@ -48,7 +48,7 @@ PROJECT_NAME           = coreMQTT
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = v3.1.1
+PROJECT_NUMBER         = v2.3.1+
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a