Implemented Trend Log ReadRange for "By Position" and "All" options.

Fixed some issues in the rest of the Trend Log code and the general ReadRange code..

bacnet-stack/demo/readrange/main.c

@@ -223,7 +223,7 @@ static void Init_Objects(
         Trend_Log_Encode_Property_APDU,
         Trend_Log_Valid_Instance, Trend_Log_Write_Property,
         Trend_Log_Count, Trend_Log_Index_To_Instance,
-        Trend_Log_Name, NULL);
+        Trend_Log_Name, TrendLogGetRRInfo);
 
 #if defined(BACFILE)
     bacfile_init();
@@ -253,8 +253,8 @@ static void Init_Service_Handlers(
     /* we must implement read property - it's required! */
     apdu_set_confirmed_handler(SERVICE_CONFIRMED_READ_PROPERTY,
         handler_read_property);
-    apdu_set_confirmed_handler(SERVICE_CONFIRMED_READ_RANGE,
-        handler_read_range);
+    apdu_set_confirmed_handler(SERVICE_CONFIRMED_READ_PROP_MULTIPLE,
+        handler_read_property_multiple);
     apdu_set_confirmed_handler(SERVICE_CONFIRMED_WRITE_PROPERTY,
         handler_write_property);
     apdu_set_confirmed_handler(SERVICE_CONFIRMED_READ_RANGE,