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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@opichals
@Ollie what is the use-case? Performance or privacy/security?
If it is privacy then it is very easy to run mosquitto or https://github.com/mcollina/aedes/blob/master/example.js (pure node.js MQTT server) on your raspberry.
If it is the broker requirement itself it looks like implementing CoAP might be the way?
Going under UDP/TCP would require support from all the specific SDKs of all the boards which seems a no-go.