Working groups continue work on the next version of the specifications named Chestnut
As we enter 2026, ITxPT is maintaining its strong momentum in evolving public transport standards. Building on the foundations laid last year, work continues at pace on the Chestnut release, focusing on the transition to broker-based architectures and the refinement of hardware installation requirements.
To ensure the delivery of robust, industry-ready specifications, our Technical Working Groups (TWG) have resumed their weekly cadence, with several critical new topics added to the 2026 agenda.
Special Technical Committee (TC) Meeting
Date: 21 January 2026 | 10:30 – 12:00 CET
Members are encouraged to join this high-priority session covering:
MQTT Broker Discovery: A dedicated workshop to evaluate alternative proposals, specifically focusing on DHCP options.
S04P07 – Ticketing: A final review of industry comments.
S01 Series: Hardware Installation & Power Management
Schedule: Every Tuesday | 11:00 – 12:00 CET
Following the restructuring of S01 to split vehicle and equipment hardware requirements, the group is now tackling:
Power Management: Defining the specific data to be exchanged regarding power states, including payload examples and topic structures to ensure energy efficiency across all onboard systems.
S04 Series: Broker-Based Architecture & Emerging Standards
Schedule: Every Thursday | 11:00 – 12:00 CET
The S04 working group continues to define the future of onboard data exchange:
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Data List & Model Review: Identifying primary areas of interest to design a streamlined topics structure for the broker.
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Batteries: Defining the technical requirements for battery data integration, ensuring compliance with upcoming regulations.
Who should attend?
This call for participation is open to all Strategic and Principal ITxPT members. Your expertise and feedback are critical to shaping the future of this specification and ensuring it meets the needs of the community.
Why participate?
This takeover meeting offers a unique opportunity to influence the development of specifications that will drive interoperability and efficiency in ITxPT architecture. Whether you’re involved in development, integration, or management, your contributions will play a vital role in this collaborative effort.
