IOPA Common Middleware

iopa-common-middleware is a JavaScript library providing a core set of IOPA (Internet of Protocols Alliance) middleware components designed for building self-hosted servers, particularly optimized for portability to constrained devices. The package is currently at version 1.4.1. Key components include `BackForth` for automatically matching requests and responses between connected devices based on sequential conversation, `Cache and Match` for automatic caching of outbound requests and correlating inbound responses across various transports like MQTT, CoAP, and raw TCP/UDP, and `ClientSend` which extends IOPA context requests with promise-based `.send()` and `.observe()` helper methods. The project describes itself as a "working prototype," indicating a focus on core functionality and portability for IoT and embedded systems, rather than rapid feature iteration or extensive community support. Its primary differentiators are its lightweight, plain JavaScript implementation suitable for low-resource environments, and its transport-agnostic approach within the IOPA framework.