webCAN

About

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webCAN is a browser-based GUI for the CANsub. The software is served by the device - simply enter the device URL in your browser to start.

Learn how to use the tool via our quickstart guide:

1. Configure - bit-rate, filters, transport protocols, transmit sequences and DBC decoding

2. Summary/Trace/Chart - view, filter and export raw or decoded data

3. Status bar - real-time device info polled directly from the CANsub

4. Any device - use webCAN on any laptop, tablet or smartphone

Note

For guidance on using webCAN e.g. for OBD2, J1939 or NMEA 2000 see the protocols section

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How to open webCAN

See the get started section.

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Changelog

To update webCAN, update your CANsub firmware as per the Docs.

# Change Log
All notable changes to webCAN will be documented in this file.

Types of changes:
- "Added": New features
- "Changed": Changes to existing functionality
- "Fixed": Bug fixes
- "Known issues": Known issues
- "Warning": Warnings


## [FW 02.04.00, API: 04.00] - 2026-08-17

### Changed
- API version updated to 04.00
- CSV export derives DataLength from DLC, not number of data bytes (affects RTR frames only)

## [FW 02.03.00, API: 03.00] - 2026-07-01

### Added
- View/edit text labels for each transmit frame (saved/loaded with device configuration files)
- DBC encoder fills a transmit frame's label with the DBC message name when the frame has no label
- Decoded signals display DBC value-table (enum) text as 'unit' if available
- Resizable MESSAGE, SIGNAL, VALUE and UNIT columns in the decoded Trace and Summary views
- Warning when removing all hardware filters from a CAN channel
- Re-uploading a DBC file with an existing name updates it in place (faster DBC editing workflow)

### Changed
- API version updated to 03.00
- Transmit sequence 'limit' value is capped at the device maximum (4294967294)
- DBC files can only be uploaded or replaced while all CAN buses are disconnected
- Device clock re-syncs if it drifts beyond 2000 ms (not only at initialization)

### Fixed
- Transmit Sequences panel always updates immediately after loading a configuration  
- Chart view cursor tooltip formats signal units correctly
- Device REST error responses (e.g. failed writes) are shown in notifications

## [FW 02.02.00, API: 02.00] - 2026-06-02

### Added
- Transmit DBC encoder search dropdown entry limit changed from 50 to 500 
- Connect buttons flag when a CAN bus is already active in another tab/tool
- Filter panel shows %-decoded information when decoding is enabled

### Changed
- PHY reverse-lookup recognizes equivalent bit-timing encodings (e.g. python-can's)
- CSV trace exports snap 1 ms outwards and default to the filtered buffer edges

### Fixed
- Trace view frame count now updates when filters change without incoming data

## [FW 02.00.00, API: 02.00] - 2026-05-18

### Added
- Initial release