IO.Box v2.3.3: ATC + CAP Enhancements, Transparent Mode Updates, Working Mode Mechanism
June 8, 2026
2.3.2
WHAT'S NEW IN IO.Box V2.3.3
- Added ATC + CAP capability query support for RAK2461 and RAK2470
- Enhanced Transparent Mode with raw payload forwarding for RAK2470
- Introduced Entering Working Mode mechanism for RAK2470
- Improved IO.Box Tool connection and configuration guidance
- Fixed multiple IO.Box, Bridge IO, and ChirpStack integration issues
- Updated firmware files with verified MD5 checksums
Compatibility Notice
Added
For RAK2461 / RAK2470
| No. | Feature | Description |
|---|---|---|
| 1 | ATC + CAP support | Allows the host tool to query the device capabilities, such as supported operating modes, Transparent Mode support, specific I/O features, and protocol version information. The returned capability data enables the tool to present the correct configuration UI, available feature options, and related operation guidance. |
For RAK2470
| No. | Feature | Description |
|---|---|---|
| 1 | Transparent Mode | Allows raw payload forwarding for applications requiring direct host-side parsing and custom data handling. |
| 2 | Entering Working Mode mechanism | The Entering Working Mode mechanism is used to switch the device from Configuration Mode to Working Mode. After the device enters Working Mode, it will start RS485-to-LoRaWAN data forwarding. At the same time, the serial connection originally used for configuration will be disconnected or disabled. |
| 3 | LoRaWAN stack update | Downgraded LoRaWAN stack to v1.0.3. |
IO.Box Tool Enhancements
| No. | Feature | Description |
|---|---|---|
| 1 | Connection and configuration improvements | Added connection failure notifications and troubleshooting guidance in the connection page. |
| 2 | Mode transition guidance | Added disconnection notifications and guidance when the device enters Work Mode or Transparent Mode. |
| 3 | Decoder update support | Supports one-click decoder update for improved deployment efficiency. |
| 4 | ATC + CAP configuration support | Supports ATC+CFGD=1 and ATC+CFGD=0 for capability-based configuration control. |
| 5 | Other optimizations | General improvements and stability enhancements in IO.Box Tool. |
Fixed Bugs
| No. | Fix / Description |
|---|---|
| 1 | [RAK2470][IO.Box] Fixed an error that occurred when using Profiles to connect to ChirpStack for an unregistered device. |
| 2 | [BridgeIO] Fixed a memory vulnerability issue in BridgeIO. |
| 3 | [RAK2470][IO.Box/FW] Fixed compatibility-related issues for IO.Box with FW v2.1.5; the PNM option is now correctly recognized, though it remains non-configurable. |
| 4 | [RAK2470][IO.Box] Fixed a decoder update anomaly that occurred when switching TTN profiles directly from ChirpStack. |
| 5 | [IO.Box] Added an explanation for the Use Reference Address option and updated the naming and description of the Register Address field. |
| 6 | [RAK2461][IO.Box] Fixed an issue where setting Register Address to 0 under the Use Reference Address option incorrectly refreshed the value to 65536. |
| 7 | [BridgeIO][IO.Box] Fixed an issue where CN470 one-click onboarding to ChirpStack failed to create a sub-band. |
| 8 | [RAK2470][IO.Box/FW][CN470] Fixed an error that occurred when sending a downlink after one-click onboarding to ChirpStack. |
| 9 | [BridgeIO][IO.Box] Fixed an issue where newly created CN470 devices connected to ChirpStack had an incorrect AppKey. |
| 10 | [RAK2461][IO.Box] Fixed an issue where CN470 one-click onboarding to TTN failed because of missing network access parameters. |
| 11 | [RAK2461][IO.Box] Fixed an issue where the Transmission Mode option was not displayed on the IO.Box RS485 configuration page after downgrading the firmware to v2.1.7. |
| 12 | [RAK2461][IO.Box] Fixed an issue where the Max Payload Size (byte) value was not displayed on the RS485 interface in CN470 ABP mode, while functioning correctly in OTAA mode. |
Checksum
For RAK2461
| File Name | Checksum Type | Checksum Value |
|---|---|---|
| rak2461_release_2.1.9_b004-stm32-bin | MD5 | 3f50d10d58e94a2caae8bb39d4195cb7 |
| IOBox_rak2461-stm32-app.bin | MD5 | 91c4ac93b8e2d3640a5004589909b435 |
| rak2461-stm32-app.bin | MD5 | 57527eb27fda775cdf4347276c659691 |
For RAK2470
| File Name | Checksum Type | Checksum Value |
|---|---|---|
| release_2.1.9_b004-stm32 | MD5 | 2fa51fd90ec65863a5620ea31f4447ae |
| IOBox_rak2470-stm32-app.bin | MD5 | c4015305c93642dafb262b9c0c35a0b6 |
| rak2470-stm32-app.bin | MD5 | 69b2082cc97cb5a9f35c77987967d24c |
