aqhome-react: finish new network reading code, improved debugging helper code.

apps/aqhome-react/units/u_valueset.c

@@ -19,6 +19,8 @@
 #include <gwenhywfar/text.h>
 
 
+#define DEBUG_DRY_RUN 1 /* don't actually set value if "1" */
+
 
 /* ------------------------------------------------------------------------------------------------
  * defines
@@ -98,8 +100,13 @@ void _cbInputData(AQHREACT_UNIT *unit, AQHREACT_PORT *port, const AQHREACT_DATAO
           break;
         }
         if (msgOut) {
+#if DEBUG_DRY_RUN
+          DBG_ERROR(NULL, "Would send data for value \"%s\"", sValueName);
+          GWEN_Msg_free(msgOut);
+#else
           DBG_INFO(NULL, "Sending data for value \"%s\"", sValueName);
           GWEN_MsgEndpoint_AddSendMessage(brokerEndpoint, msgOut);
+#endif
         }
       }
     }