Converted all the BACnet-array-index variables from int32 to uint32 as they were intended.

bacnet-stack/demo/handler/s_rp.c

@@ -55,7 +55,7 @@
  * @param array_index [in] Optional: if the Property is an array,
  *   - 0 for the array size
  *   - 1 to n for individual array members
- *   - -1 for the full array to be read.
+ *   - BACNET_ARRAY_ALL (~0) for the full array to be read.
  * @return invoke id of outgoing message, or 0 if device is not bound or no tsm available
  */
 uint8_t Send_Read_Property_Request(
@@ -63,7 +63,7 @@ uint8_t Send_Read_Property_Request(
     BACNET_OBJECT_TYPE object_type,
     uint32_t object_instance,
     BACNET_PROPERTY_ID object_property,
-    int32_t array_index)
+    uint32_t array_index)
 {
     BACNET_ADDRESS dest;
     BACNET_ADDRESS my_address;