---
title: BHDO 4.0.15
slug: bhdo-v3/bhdo-4015
createdAt: 2026-08-13T15:59:41.299Z
---

Release Date: July 31, 2026

Review the current list of [Limitations](docId\:h__fc5ptzbpy09hJnwrAG).

## Enhancements

| Description                                                                                                                                                                                                                                                                                                                                                                                                               |
| ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **DeviceHub:**<br />- The MQTT Sparkplug B Client driver is available in this release.                                                                                                                                                                                                                                                                                                                                    |
| **Digital Twins:**<br />- Removed the 2,000-item limit on the number of dynamic attributes that can be created on a single model. This allows for models that require a higher limit.<br />- Added `$EDGE_DT_MODEL_ID` and `$EDGE_DT_INSTANCE_ID` as available system variables for use in Digital Twins model and instance configuration. This supports tracking and analysis of Digital Twins data in external systems. |

## Resolved Issues

| Description                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **DeviceHub:**<br />- Fixed issue where the IEC102, Mitsubishi FX, Siemens TI505, and Fanuc drivers accepted certain multi-character address suffixes that produced incorrect register addressing. These suffixes are no longer supported.<br />- Fixed issue where the Beckhoff TwinCAT3 Ethernet Absolute (Gen1.3) and Beckhoff TwinCAT3 Ethernet Symbolic (Gen1.3) drivers returned a timestamp of `0` for failed tag reads. Tags now publish the current timestamp in this case |