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WoT Reference Platforms

Categories:

  • a "large" device able to consume TDs, perform orchestration, and host a directory service;
  • a "small" device able to be integrated into battery-operated IoT controllers directly integrated into smart things;
  • a "minimum" device which is the smallest and cheapest hardware capable of being integrated into a WoT system. These should align with profile requirements (see w3c/wot-profile#68).

Large Reference Hardware Platform

  • Everything the "small" can do
  • Capable of running node-wot under Node.js (v15); see https://github.com/eclipse/thingweb.node-wot/actions/runs/551792528
  • Capable or running node-red
  • Capable of running multiple orchestration services as instance of node-wot
  • Capable of running a WoT directory service and supporting discovery (mDNS, SD)
  • Capable of more sophisticated RDF processing
  • Capable of acting as a proxy or as a shadow for other WoT Things (e.g. as a hub)
  • Capable of running a web server (e.g. NGNIX)
  • Optional: running a web browser (e.g. Chromium, Firefox, etc.)
  • Optional: capable of hosting a dashboard interface (display, keyboard, mouse/touch screen)
  • Note: may run headless in many use cases, HUI is optional
  • Capacities: 512MB to 1GB RAM and 4GB Flash
  • Example: RaspPi 3B+ or better; RaspPi0 is adequate for some things (1GB memory minimum)

Small Reference Hardware Platform

  • Has network connectivity and TCP/IP stack

  • Capable of natively running RESTful interface over HTTP or CoAP

  • Capable of TLS or DTLS encryption

  • Capable of minimum security (at least passwords, ideally tokens)

  • Self-describing (can provide its own TD and/or register TD with a directory service)

  • Capable of basic consumption of core profile TDs

    • Controller can discover devices to control and access them
    • Ex: a switch can find devices with iot:Switch capabilities and turn them on and off

  • Simple I/O devices: switches, I2C, UART ports, LEDS, maybe a small display

  • Capacities: 512KB RAM and 1M Flash

  • Example: ESP32-based NodeMCU or M5Stack

  • Notes:

    • Profiles is looking at 64KB as a minimum requirement
    • Philipp is working with the Nordic NRF-52832, which can do some of the above, and has 32KB RAM and 256KB flash, but would probably not be consuming TDs (need to understand use cases)
    • Hardware acceleration widely available for some relevant features (e.g. signing, TLS, etc.)

Minimum Reference Hardware Platform

  • Not required to self-host own TD
  • Has network connectivity but may not be TCP/IP
  • Generally requires a hub for protocol translation to integrate with HTTP-based WoT systems
  • Example: Zigbee Light Switch