Added a parameter to Device_Encode_Property_APDU so that it matched all the ther objects, which required all the demo and ports to modify their device and h_rp files.

bacnet-stack/ports/atmega8/device.c

@@ -170,6 +170,7 @@ bool Device_Object_List_Identifier(
 /* return the length of the apdu encoded or -1 for error */
 int Device_Encode_Property_APDU(
     uint8_t * apdu,
+    uint32_t object_instance,
     BACNET_PROPERTY_ID property,
     int32_t array_index,
     BACNET_ERROR_CLASS * error_class,
@@ -184,6 +185,7 @@ int Device_Encode_Property_APDU(
     uint32_t instance = 0;
     unsigned count = 0;
 
+    object_instance = object_instance;
     /* FIXME: change the hardcoded names to suit your application */
     switch (property) {
         case PROP_OBJECT_IDENTIFIER:

bacnet-stack/ports/atmega8/h_rp.c

@@ -61,7 +61,9 @@ int Encode_Property_APDU(
             if (Device_Valid_Object_Instance_Number(rp_data->object_instance)) {
                 apdu_len =
                     Device_Encode_Property_APDU(&apdu[0],
-                    rp_data->object_property, rp_data->array_index,
+                    rp_data->object_instance,
+                    rp_data->object_property, 
+                    rp_data->array_index,
                     error_class, error_code);
             }
             break;