Add the capability to use Gazebo Harmonic if it is installed

src/modules/simulation/gz_bridge/CMakeLists.txt

@@ -32,13 +32,13 @@
 ############################################################################
 
 # Find the gz_Transport library
-find_package(gz-transport
-	#REQUIRED COMPONENTS core
-	NAMES
-		#ignition-transport11 # IGN (Fortress and earlier) no longer supported
-		gz-transport12
-	#QUIET
-)
+# First look for GZ Harmonic libraries
+find_package(gz-transport NAMES gz-transport13)
+
+# If Harmonic not found, look for GZ Garden libraries
+if(NOT gz-transport_FOUND)
+	find_package(gz-transport NAMES gz-transport12)
+endif()
 
 if(gz-transport_FOUND)
 

src/modules/simulation/gz_bridge/GZMixingInterfaceESC.hpp

@@ -35,6 +35,7 @@
 
 #include <lib/mixer_module/mixer_module.hpp>
 
+#include <gz/msgs.hh>
 #include <gz/transport.hh>
 
 #include <uORB/PublicationMulti.hpp>