A ready-to-use OBD-II telematics device pre-flashed for Traccar GPS tracking.

Freematics ONE+ Traccar Edition is a programmable OBD-II vehicle telematics device based on Freematics ONE+. It comes pre-flashed with open-source firmware designed to connect to Traccar, allowing you to start testing GPS tracking, vehicle telemetry, and remote data transmission with minimal setup.

The device integrates an ESP32 controller, 4G LTE cellular connectivity, GNSS positioning, OBD-II access, CAN bus monitoring, motion sensing, microSD storage, Wi-Fi, Bluetooth, and useful onboard peripherals in one compact OBD dongle.

Each unit has its device ID printed on the back, making setup easier when adding the device to Traccar.

Designed for Traccar Prototyping

Freematics ONE+ Traccar Edition is intended for developers, researchers, hobbyists, and system integrators who want to evaluate or prototype vehicle tracking solutions with Traccar.

Out of the box, the device is pre-configured to work with Traccar's demo server. It can also be configured for use with your own Traccar server or private deployment.

Use it to build or test:

• Vehicle GPS tracking
• OBD-II telemetry logging
• Fleet tracking prototypes
• Remote diagnostics projects
• CAN bus monitoring applications
• Vehicle movement and trip detection
• Custom automotive IoT solutions

Important Disclaimer

This is an Arduino and ESP-IDF compatible development product designed for prototyping, research, and hobbyist use with Traccar software.

The device is shipped with pre-flashed firmware expected to work out of the box with Traccar’s demo server, and it can be configured for other Traccar deployments. The open-source Traccar client firmware and its dependent Arduino libraries are regularly maintained and improved, but they are provided as is, without any software warranty.

The hardware is covered by the same one-year limited warranty as other Freematics products.

Key Features

• Pre-flashed Traccar client firmware for faster setup
• Printed device ID on each unit for easier Traccar configuration
• Dual-core ESP32 programmable SoC
• Built-in Wi-Fi and Bluetooth
• Integrated 4G LTE cellular connectivity
• GNSS positioning with built-in and external options
• OBD-II access for standard PIDs, DTCs, VIN, and ECU data
• CAN bus sniffing for advanced vehicle network monitoring
• G-force and motion sensing
• Vehicle battery voltage reading
• Data storage in internal flash or on microSD card
• Real-time data transmission over Wi-Fi or cellular network
• Arduino and ESP-IDF compatible development workflow

Hardware Overview

Freematics ONE+ Traccar Edition combines the core hardware needed for vehicle tracking and telemetry in one compact OBD-II device.

Specifications

• Espressif ESP32 with 16MB flash
• Built-in 802.11 b/g/n Wi-Fi
• Dual-mode Bluetooth, including Classic Bluetooth and BLE
• Integrated ICM-42627 motion sensor
• Integrated u-blox M9 GNSS module and antenna, depending on selected model
• Integrated 4G LTE cellular module
• Integrated microSD card reader
• Integrated buzzer
• Compact enclosure: 60 × 48 × 20 mm

Model Options

Model A — External GNSS

Model A uses an external GNSS receiver with a u-blox M9 chip and antenna. The receiver is connected with a 1-meter cable, allowing it to be positioned where GNSS signal reception is stronger, such as near a windshield or exposed to open sky.

This option is recommended when the vehicle’s OBD port is located in a position that may limit GNSS reception.

Model B — Internal GNSS

Model B includes a built-in u-blox M9 GNSS module and active ceramic antenna inside the device.

This option keeps the installation compact and cable-free. GNSS signal quality may vary depending on the location and orientation of the vehicle’s OBD port.

OBD-II Compatibility

Freematics ONE+ Traccar Edition plugs directly into a vehicle’s OBD port, which is usually located under the steering column. It can access standard OBD-II data from compatible vehicles, including PIDs, diagnostic trouble codes, VIN, and vehicle ECU information.

Supported vehicle protocols include:

• CAN 500Kbps / 29-bit
• CAN 250Kbps / 29-bit
• CAN 500Kbps / 11-bit
• CAN 250Kbps / 11-bit
• KWP2000 Fast
• KWP2000 5Kbps

To confirm whether your vehicle is OBD-II certified, check the emissions or compliance sticker under the hood.

Bluetooth and Mobile App Support

Freematics ONE+ includes dual-mode Bluetooth and can work with the Freematics Controller App over BLE when running supported datalogger sketch or telelogger sketch.

This makes it possible to configure, monitor, and test the device from a mobile device without relying only on a wired USB connection.

Cellular Connectivity

Freematics ONE+ Traccar Edition uses integrated cellular connectivity for real-time data transmission to Traccar over a mobile network.

Depending on the selected hardware configuration, supported cellular modules may include LTE CAT-M, LTE CAT-1, or LTE CAT-4 options.

SIM Card

A microSIM card is required for cellular connectivity. Insert the SIM card into the slot in the direction shown in the product images.

Global IoT SIM cards, including Hologram IoT SIM, are supported.

microSD Storage

A 32GB microSD card is available as an optional accessory. When selected, the card is inserted into the device before shipping.

The microSD card can be used for local storage of GNSS data, OBD-II telemetry, CAN bus data, motion data, and diagnostic information.

Development

Freematics ONE+ Traccar Edition is not a closed tracking device. It is a programmable development platform that can be customized for your own vehicle telematics projects.

Freematics provides a dedicated Arduino library for accessing the device’s hardware resources, along with reference Arduino sketches for common use cases. This allows developers to build on existing working examples instead of starting from scratch.

Freematics Arduino Builder provides a graphical interface for configuring, compiling, and uploading Arduino sketches. For more advanced development, PlatformIO is recommended. The reference code is also organized as PlatformIO projects, while Arduino IDE, Arduino makefile, and ESP-IDF-based workflows remain available.

For setup and development details, refer to the Developers Guide.

Shipping List

• Freematics ONE+ x 1
• GNSS receiver (optional) x 1
• OBD extension cable  (optional) x 1
• Micro USB cable (optional) x 1

Links

• Developers Guide
• Configuration Guide
• Telelogger with Arduino as ESP-IDF Component