CoAP support

[beriberikix]

I'm curious what it would take to support CoAP. CoAP is a popular protocol used in IoT to interact with constrained devices. Ideally a solution would support CoAP and HTTP endpoints so the same application can be used between Web/Mobile/Server clients as well as things like microcontrollers. I noticed there is a project to support MQTT (https://github.com/strongloop/loopback4-extension-mqtt,) another protocol popular in IoT. Is that a good model to follow? Are there guides that might be helpful?

[raymondfeng]

I'm starting to explore how to integrate with messaging protocols such as websocket, mqtt and pub/sub brokers such as kafka, redis, .... See a PoC at https://github.com/raymondfeng/loopback4-example-websocket.

[raymondfeng]

See #1884

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