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Implementation of Mongoose OS RPC over MQTT protocol

Overview

MQTT RPC channel allows invoking RPC calls via MQTT.

Topics

When rpc.mqtt.enable is true (default), device subscribes to rpc.mqtt.sub_topic (default: ${device.id}/rpc, e.g. esp8266_DA7E15/rpc in the example).

Responses are published to ${src}/rpc, where ${src} is taken from the request's frame, so requests for which a response is expected must include src.

Examples

Request

Published to esp8266_DA7E15/rpc:

{ "id": 123, "src": "foo", "method": "Sys.GetInfo"}

Response will be published to foo/rpc.

mos tool support

mos tool supports RPC over MQTT via the mqtt port schema:

$ mos --port mqtt://iot.eclipse.org/esp8266_DA7E15 call Sys.GetInfo

For brokers that require TLS, mqtts should be used:

$ mos --port mqtts://iot.eclipse.org/esp8266_DA7E15 call Sys.GetInfo

For brokers that require TLS client authentication (e.g. AWS), cert and file should be supplied:

$ mos --port mqtts://XXXXXXXX.iot.REGION.amazonaws.com/esp8266_DA7E15 --cert-file mycert.pem --key-file mykey.pem call Sys.GetInfo