ISO14229 UDS protocol stack for automotive ECU development

What is UDS and Why is RAPIDSEA Your Choice?

The Unified Diagnostic Services (UDS) protocol, defined by the ISO 14229 standard, is the essential communication backbone for diagnostics, troubleshooting, and ECU reprogramming in modern vehicles. It establishes a standardized client-server communication between an external diagnostic tester tool (client) and the Electronic Control Units (ECUs) within the vehicle (server).

RAPIDSEA UDS Stack isn't just a standard implementation; it's a performance-optimized, ready-to-integrate solution built for the demands of today's and tomorrow's Software-Defined Vehicle (SDV) architectures. Our stack cuts down your development cycles by providing a robust, pre-validated core that is both hardware-agnostic and fully compliant with the latest specifications. Our Flint IDE allows developers to configure this stack easily using intuitive graphical interfaces.

Some of the popular MCUs on which our stack is ported are being used today for automotive ECU development are Renesas RH850/F1K, RH850/D1M1A, Renesas RL78, NXP S32K, Infineon Traveo S6J3360 etc.

Comprehensive UDS Protocol Service Coverage

Our stack implements all mandatory and widely used optional Unified Diagnostic Services (SIDs) as per ISO 14229-1, ensuring full functional coverage for all diagnostic needs, from basic fault reading to advanced Secure Flashing.

Service ID	Name	Description
10h	Diagnostic Session Control	Initiate different types of diagnostics sessions
11h	ECU Reset	Perform ECU Reset to revert back to default session
14h	Clear Diagnostic Information	Clear diagnostic trouble codes (DTC) stored in the ECU
19h	Read DTC Information	Read diagnostic trouble codes (DTC)
22h	Read Data By Identifier	Request data from the ECU
23h	Read Memory By Address	Read data from the memory address provided
27h	Security Access	Limit access to data and services to prevent unauthorized access
28h	Communication Control	Manage the exchange of messages in the ECUs
2Eh	Write Data By Identifier	Write data onto the server
2Fh	IO Control By Identifier	Control the input/output signals through the diagnostic interface
31h	Routine Control	Perform start, stop and get status on predefined routines
34h	Request Download	Request server to initiate download data
35h	Request Upload	Request server to initiate upload data
36h	Transfer Data	Perform data transfer to/from server
37h	Request Transfer Exit	Terminate and exit data transfer
3Dh	Write Memory By Address	Write information into the ECU memory location
3Eh	Tester Present	Indicate that the client is still connected and keep diagnostic sessions active.
85h	Control DTC Setting	Enable/disable updating of DTC settings in ECU
7Fh	Negative Response Handling	Manage error handling for unsupported or failure requests

All these services are available for Server and client mode of operations and hence can be utilized to implement both OBD2 UDS diagnostics ECUs and testers.

Transport Layer Flexibility – One Codebase, Every Network

RAPIDSEA UDS runs unchanged over ISO 15765-2 DoCAN/CAN-FD, ISO 13400 DoIP (100/1000BASE-T1 Automotive Ethernet), FlexRay, and LIN (via lightweight gateway). The same binary can listen on multiple physical interfaces simultaneously – a capability proven in zonal controllers and telematics gateways. This future-proof design eliminates the need for multiple protocol variants and dramatically reduces validation effort when migrating from CAN to Ethernet-based architectures.

UDS Server for ECU Developers

RAPIDSEA’s ISO 14229 UDS stack empowers OEMs and Tier-1 suppliers to embed full diagnostic capabilities directly into ECUs and mobility infrastructure (e.g., charging systems, gateway units, BMS, powertrain ECUs). Key advantages include:

Secure and reliable diagnostic channel

Offer a trusted and secure communication link between diagnostic tools and ECUs, safeguarding diagnostic and configuration data.

Comprehensive diagnostic service support

Leverage the full breadth of UDS services: session management, DTC reading and clearing, memory access, data-by-identifier (DID) read/write, I/O control, routine execution, and more.

Diagnostic trouble-code (DTC) management and fault retrieval

Easily collect, store, retrieve, and clear diagnostic trouble codes along with comprehensive ECU status and health-related telemetry data.

Hardware-agnostic & cross-platform

Designed for portability across varied MCU architectures (8-, 16-, 32-, 64-bit), enabling seamless integration regardless of hardware or OS choice.

Flexible ECU configuration & end-of-line (EOL) settings

Program vehicle- or variant-specific settings using DIDs, set up configuration data, and manage variant calibration during manufacturing or service.

Modular stack architecture with firmware update support

Embed the server stack into existing ECU firmware with minimal changes, enabling secure firmware updates and reprogramming when needed.

UDS Client for Testers & Diagnostic Tool Developers

For diagnostic-tool developers, workshop solution providers, or calibration-tool vendors, the RAPIDSEA UDS Client stack offers a highly configurable, high-performance foundation to build Windows, PC-based, or embedded diagnostic applications. Key features include:

High-performance and configurable architecture

Fine-tune critical parameters such as P1/P2 timing windows, message sizes, and frame counts to match target ECU behavior and ensure stable diagnostics.

Full access to all UDS services

From reading/writing DIDs and memory, fault code interrogation, I/O control, to secure operations via Security Access, giving you end-to-end diagnostic and configuration control.

Calibration and data-management support

Easily retrieve calibration data or load updated parameters to ECUs, ideal for actuator calibration, sensor tuning, or variant configuration.

Cross-platform tool support

Pre-built client stack available as Windows DLL for .NET / desktop applications; also compatible with common diagnostic toolchains such as Vector and PEAK.

Ready for ECU validation & compliance testing

Use the client stack as a validation suite to verify conformance, error-handling (negative responses), security mechanisms, and full system diagnostics.

Secure key generation & security-gated operations

Abstracted handling of security keys for authenticated diagnostic or firmware-update access, for controlled and safe interactions with ECUs.

UDS related service offerings

UDS Stack Porting Services

While the RAPIDSEA UDS stack is being supported for a plethora of MCUs and platforms, Embien can help port the same to unsupported customer platforms and targets. With support for both DoCAN and DoIP transport layers, we can help run the UDS stack over one or both interfaces in an optimized manner as per the target architecture.

Diagnostics Feature

While the RAPIDSEA UDS stack provides mechanisms to enable different services, it is important to seamlessly integrate the same to the underlying business logic. Whether it is the DTC management or reading/writing DIDs or performing routine control operations, Embien can help integrate your diagnostics feature logic seamlessly with our stack.

Bootloader & Updates

One of the major use cases of the UDS functionality is to perform firmware update on the target Engine Control Unit (ECU). Embien with its other offering of RAPIDSEA CAN bootloader and its proven expertise on performing firmware updates on numerous ECUs, can help customers quickly integrate this crucial feature for their devices.

UDS Validation Services

With rich experience in diagnostics tools from leading vendors like Vector, Embien can help customers validate their UDS implementation against standards. We can also identify the functional and performance issues and sort them out and assist in bringing out the product quickly to the market in conformance to the specifications.

Telematics Integration

Apart from supporting the server functionality, our RAPIDSEA UDS stack also supports client or tester feature. Embien has leveraged this on Telematics Control Unit and Telematics Gateway Units to support remote firmware. The TCU/TGC downloads the latest update images over Wi-Fi/LTE etc. and can perform ECU updates one after another.

ECU Security

Having worked to enable cybersecurity features on various embedded devices and applications, Embien can help customers realize fool-proof security for their automotive ECUs. Right from supporting secure bootloader to protecting UDS data using its security mechanisms, we can prepare your ECUs to withstand against the next generation of cyberthreats.

Security, Validation & Compliance

Security and standards compliance are fundamental to RAPIDSEA’s UDS stack:

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Seed/Key Security Access (SID 0x27)

This stack provides multiple-level, authenticated diagnostic access to protect critical operations.

Secure Bootloader Compatibility

Works with bootloaders that validate signed firmware (for example: RSA, other cryptographic schemes).

Extensive Validation Services

Embien provides UDS implementation validation (unit tests, integration tests, etc.), including negative response handling.

Standards Compliance

Written in MISRA-C, fully documented with High-Level and Low-Level design documents, & supported by detailed test reports.

Use Cases of RAPIDSEA UDS Stack

RAPIDSEA’s UDS stack is engineered for a wide variety of automotive scenarios. Some of the most impactful use cases include:

ECU Development (Server)

Implement UDS services in ECUs (BMS, MCUs, instrument clusters, TCUs) for diagnostics, end-of-line calibration, and variant configuration.

Diagnostic Testers (Client)

Create high-performance diagnostic tools / testers for workshop or engineering environments, with support for all UDS services.

Firmware & Calibration Updates

Use UDS services (Request Download, Transfer Data, Request Transfer Exit) to perform reliable and secure in-vehicle or in-factory firmware flashing.

Telematics & Remote Diagnostics

With DoIP transport, run UDS in TCUs / gateways to enable OTA updates, remote fault reporting, and remote calibration.

Security-sensitive Diagnostics

Use Security Access (SID 0x27) to guard sensitive ECUs or operations.

RAPIDSEA UDS Stack Package

Explore our comprehensive library of documents and demo videos

User Manual

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General Documents

Download the UDS protocol stack brochure to know in detail

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Video Demonstrations

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Post-Purchase Document

QSG, Gtests
MISRA Compliance
HDD, LDD

Gated Access Resources

Test report
Pricing
Evaluation Package

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Technical Reports

Resource Utilization
Tracability Matrix
Evaluation Version Binary (Windows, Linux)

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FAQs

How easy it is to integrate RAPIDSEA stack to my existing application?

If you are coder, we have a detailed list of APIs with example implementations, that can be readily integrated in your application. If you are not, it is even easier. Leverage our Flint System Configurator to configure and utilize the same.

What are the considerations for integrating RAPIDSEA UDS stack?

I do not want to share our target details with anyone. Can I port RAPIDSEA UDS stack on to the target myself?

I already have ISO-TP running on my ECU. Can I just incorporate your UDS stack alone?

What is the licensing model? Are there any hidden cost involved?

I do not find my target MCU listed in the supported platforms list. How can it be supported?

I want to evaluate the stack before buying it. Is it possible?

I want to develop a Windows/Linux based tester application with my own/available tools. Can I use your UDS stack for the same?

Can you give some insights about your stacks’ performance?

Where all your RAPIDSEA UDS stack is being used?

Can RAPIDSEA UDS be used for SOTA/FOTA updates?

NEED RAPIDSEA ISO14229 UDS protocol stack immediately?

Discuss with our Unified Diagnostic Services protocol experts to get it integrated with your automotive ECU development.

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RAPIDSEA ISO14229 UDS Protocol Stack

Robust, Secure Diagnostic Solution for Automotive ECUs