---
title: "LTS14 On-Premises Connector Host"
slug: "lts14-on-premises-connector-host"
updated: 2026-02-02T09:32:56Z
published: 2026-02-02T09:32:56Z
---

> ## Documentation Index
> Fetch the complete documentation index at: https://support.tulip.co/llms.txt
> Use this file to discover all available pages before exploring further.

# LTS14 On-Premises Connector Host

We are excited to announce the release of **LTS14**, the latest long-term support version of the **On-Premises Connector Host**.

With this release, the Connector Host now supports:

- Specifying a **base path** for an HTTP connector environment
- Writing to **OPC UA and MQTT** natively in Tulip
- Allow users to define a default value for **OAuth token**  refresh
- A new setting to expose the **clean session** field when creating an MQTT connection
- Various **bug fixes and feature improvements**

### Write to Machine Attributes

You can now write back to your **machine attributes** with **OPC-UA and MQTT data sources** without requiring additional middleware through Tulip.

For more details, see the knowledge base article: [Write to Machine Attributes Using OPC-UA & MQTT](https://support.tulip.co/docs/write-to-machine-attributes-using-opc-ua-mqtt)

### Allow users to define a default value for **OAuth token** refresh

The **"Expires In (s)"** field in the Connector environment configuration settings for OAuth2 integrations now supports default values. This setting provides a **fallback expiration time** if the **`expires_in`** property is missing from the response and a **`refresh_token`** is available.

### Configure MQTT Connectors to Start Sessions with `clean = false`

A new configuration field has been added when creating an MQTT connection. This field determines whether the broker should store messages while the Connector Host is disconnected. Learn more about this [here](https://support.tulip.co/r230/docs/how-to-build-your-first-mqtt-data-source)

### Check if Your On-Prem Connector Host (OPCH) Needs an Upgrade

Starting with **LTS14/r308**, Tulip will enforce version alignment between the **Tulip Cloud and **On-Prem Connector Host (OPCH)** to ensure feature compatibility. Learn more [here](https://support.tulip.co/r230/docs/on-prem-connector-host-version-support).

If your OPCH requires an update, you can check this in the **Account Settings** page when a supported OPCH version is available. The information will include:

- How to upgrade
- Which OPCH version to upgrade to
- When the upgrade needs to be completed

Full list of tickets in this release:

PLAT-41926 PLAT-41922 PLAT-41853 PLAT-41710 PLAT-41506 PLAT-41505 PLAT-41504 PLAT-41307 PLAT-40953 PLAT-40888 PLAT-40590 PLAT-40395 PLAT-40019 PLAT-39814 PLAT-39813 PLAT-39774 PLAT-39767 PLAT-39744 PLAT-39496 PLAT-39146 PLAT-39109 PLAT-38906 PLAT-38751 PLAT-38024 PLAT-37947 PLAT-37830 PLAT-37701 PLAT-37654 PLAT-36821 PLAT-36693 PLAT-34103 PLAT-33820 PLAT-32423 PLAT-30798 PLAT-30408 PLAT-29888 PLAT-29751 PLAT-29536 PLAT-28867 PLAT-28766 PLAT-28560 PLAT-28447 PLAT-28046 PLAT-27186 PLAT-26761 PLAT-24188 PLAT-21657 PLAT-20889 PLAT-19536 PLAT-19533 PLAT-19532 PLAT-19433 PLAT-18621 PLAT-18378 PLAT-16169 PLAT-15118 PLAT-14540 PLAT-8543 PLAT-8443 PLAT-8442 PLAT-7382 PLAT-6848 PLAT-32347 PLAT-30355 PLAT-31257 PLAT-33537 PLAT-32459 PLAT-34985 PLAT-32870 PLAT-30764 PLAT-31457 PLAT-29738 PLAT-29872 PLAT-35000 PLAT-34232 PLAT-33655 PLAT-33975 PLAT-32276 PLAT-31774 PLAT-34745 PLAT-28610 PLAT-30659 PLAT-32678 PLAT-20094 PLAT-26630 PLAT-35278 PLAT-29522 PLAT-30063 PLAT-29530 PLAT-32764 PLAT-38236

### Conclusion

If you encounter any difficulties during the update process, our customer support team is ready to assist you. Please contact them via [support@tulip.co] or live chat in your instance.