Send HEARTBEAT mesage from Godot

SConstruct

@@ -14,6 +14,7 @@ env = SConscript("modules/godot-cpp/SConstruct")
 
 # tweak this if you want to use different folders, or more folders, to store your source code in.
 env.Append(CPPPATH=["src/"])
+env.Append(CPPPATH=["include/"])
 sources = Glob("src/*.cpp")
 
 # Generated with local Godot installation
@@ -48,5 +49,7 @@ else:
         "project/bin/libmarshconnector{}{}".format(env["suffix"], env["SHLIBSUFFIX"]),
         source=sources,
     )
+    # Triggered a lot in MAVLink headers
+    env.Append(CXXFLAGS=["-Wno-address-of-packed-member"])
 
 Default(library)