Moddable SDK 5.8.0

Moddable SDK 5.8.0 contains improvements made between May 12, 2025 and June 11, 2025.

Realtime AI

This release sees our Realtime AI support continuing to expand with Deepgram joining our ChatAudioIO architecture. Deepgram's Voice Agent API provides realtime conversational AI support with a focus on enterprise applications.

Deepgram is noteworthy for being the only Realtime AI API using WebSockets to support binary transfer of audio data. This uses 25% less network bandwidth than the Base64 encoding used by everyone else; and requires less memory and CPU power to serialize and parse. Put another way, Deepgram is the lightest realtime AI service, which makes it a great choice for microcontroller projects.

Deepgram joins OpenAI, Google Gemini, ElevenLabs, and Hume AI in our ChatAudioIO. Imagine a single API that lets you easily build interactive voice chatbots with any of five leading AI services and do that efficiently on a low-cost microcontroller. And we're not done yet. Moddable has exciting updates planned. Stay tuned.

ESP-IDF I²C downgrade

Last month, the Moddable SDK's I²C support for ESP32 migrated to Espressif's new i2c_master API. Unfortunately, we have too many reports of issues from this change, including random read and write failures, and crashes when I²C and the JTAG USB connection are used simultaneously. Consequently, we've reverted the changes in this release. We will monitor the Espressif releases for improvements and try to report the issues encountered to Espressif.

Release Details

• Modules
  • ChatAudioIO - add support for Deepgram AI service
  • WebStorage – return null for missing elements to match HTML5
• ECMA-419
  • Analog input on ESP32 again works for multiple inputs (reported by @mshioji)
  • httpclient passes response's status text to onHeaders
  • fetch and EventSource use status text provided by httpclient
  • EventSource handles id property and missing options to constructor
  • Revert I²C API migration on ESP32 from previous release
• Devices
  • M5Atom S3R added (contributed by @kitazaki)
  • M5Atom Echo Base added (contributed by @kitazaki)
• XS
  • RegExp.escape() now supported. This is part of ES2025.
  • Immutable ArrayBuffer conformance improvements with latest test262
  • Import more math functions from fdlibm (for hosts that cannot use the platform mathlib)
  • String.prototype.fromCharCode conformance fix on integer input
  • Fix obscure marshalling native stack overflow (found by Fuzzilli)
  • Fix await lookahead token for arrow function with expression body (found by oss-fuzz)
  • Check meter on several more Array functions to trigger timeouts (found by oss-fuzz)
• Examples
  • mini-drag example reports incompatibility with ECMA-419 touch driver
• Tools
  • New M5Atom S3 simulator for mcsim (contributed by @stc1988)
  • mcconfig path corrected on builds of ESP32 on Linux when USE_USB is 1 (device using TinyUSB for xsbug connection)
• TypeScript
  • Add typings for Crypto Digest class (contributed by @stc1988)
  • Add optional second argument to Net.get() (contributed by @stc1988)

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