Moddable SDK 5.10.0

Moddable SDK 5.10.0 contains improvements made between July 16, 2025 and August 12, 2025.

This is a relatively small release due to summer holidays and work on features that are not yet ready to publish.

ESP-IDF v5.5.0

The Moddable SDK has migrated to ESP-IDF v5.5.0 for all ESP32 family builds. The release contains many improvements by Espressif, particularly I²C and BLE. As usual, there should be no code changes required for the vast majority of projects using the Moddable SDK. Updating takes just a few minutes:

• If you used xs-dev to install the Moddable SDK, execute xs-dev update --device esp32
• Otherwise, follow the update instructions for macOS and Linux, or Windows.

ESP-IDF I²C Upgrade, again

In Moddable SDK 5.10.0, we've brought back support for Espressif's new i2c_master API. With ESP-IDF v5.5, the majority of issues appear to have been resolved. We are still working around one bug.

New ECMA-419 BLE Client, continued

This release contains numerous improvements to our new BLE Client and Web Bluetooth module. Thank you to @stc1988 and @mshioji for sharing their suggestions and observations. Learn about our new BLE Client in last month's release notes. We've also integrated our new BLE Client into Node-RED MCU Edition.

Release Details

• ECMA-419
  • BLE Client
    • Fix characteristic completion callback on macOS
    • Set target in constructor
    • UUID strings are lowercase (macOS)
    • Report scan errors (ESP32)
    • Ensure enableNotifications() fully completes before the next queued operation starts (ESP32)
    • Disable Espressif's auto-reconnect (ESP32)
    • Encode connection type into address to allow connecting to non-public addresses (ESP32)
    • Fix 128-bit UUID strings (ESP32)
    • Work around bug in ESP-IDF v5.5 NimBLE that disables notifications
    • Improve out-of-memory failure handling (ESP32)
• Modules
  • Web Bluetooth
    • getCharacteristics works for find all (contributed by @stc1988)
    • getPrimaryServices and getCharacteristics work when passed no arguments
    • Eliminate double new in properties getter (contributed by @stc1988)
    • removeEventListener fix for finding item (contributed by @stc1988)
    • Fix typo with writeWithOutResponse (contributed by @stc1988)
  • Migrate M5StackCoreTouch to ECMA-419 (contributed by @stc1988)
• Examples
  • io/ble – uuids are lowercase
• Documentation
  • Apply results of spell check run by @stc1988 to correct many small mistakes
  • Remove obsolete "id" references from Timer documentation (suggested by @stc1988)
• Tools
  • mcpack reports module format requested when reporting invalid module format
  • Workaround undefined left shift in fmod. This will likely change again in the next release to a more complete solution.
• Typings
  • Add Base64 & Hex to Uint8Array
  • Declarations for new ECMA-419 BLE client
  • Add default export for URL module
• Devices
  • Added creation to all ESP32 devices without one. These are required for optimal default memory partitions.

Contact Us

If you have questions or suggestions about anything here, please reach out:

• Start a new Discussion on our GitHub repository
• Drop by our Gitter to chat
• Contact us on X / Twitter at @moddabletech