MQTTv5 CONNECT and PUBLISH implementation

.github/.cSpellWords.txt

@@ -45,3 +45,5 @@ Vect
 VECT
 Werror
 Wunused
+MQTTV
+mqttv

CTestTestfile.cmake

@@ -0,0 +1,8 @@
+# CMake generated Testfile for
+# Source directory: /home/ubuntu/coreMQTT/test
+# Build directory: /home/ubuntu/coreMQTT
+#
+# This file includes the relevant testing commands required for
+# testing this directory and lists subdirectories to be tested as well.
+subdirs("unit-test/MQTT")
+subdirs("unit-test/MQTTv5")

docs/doxygen/config.doxyfile

@@ -2295,7 +2295,8 @@ INCLUDE_FILE_PATTERNS  =
 # recursively expanded use the := operator instead of the = operator.
 # This tag requires that the tag ENABLE_PREPROCESSING is set to YES.
 
-PREDEFINED             = DOXYGEN=1
+PREDEFINED             = DOXYGEN=1 \
+                         MQTT_VERSION_5_ENABLED=1
 
 # If the MACRO_EXPANSION and EXPAND_ONLY_PREDEF tags are set to YES then this
 # tag can be used to specify a list of macro names that should be expanded. The