Enhance logging functionality across multiple scripts, enabling debug mode checks and detailed communication logs for serial connections and firmware updates.

cartest_manage.php

@@ -343,7 +343,7 @@ echo '
 <script src = "./assets/DYMO.Label.Framework.latest.js?'.script_version.'" type="text/javascript" charset="UTF-8"> </script>
 <script>
 	var link = "'.$baseurl.'";
-
+	var DEBUG = '.(debug ? 'true' : 'false').';
     function startGraph(){
         setInterval(renderChart,5000);
     }