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Re:Mosquitto: An open-source MQTT broker by ducktective on Wednesday September 29, 2021 @12:31PM (#28696039)
https://nats.io/ https://github.com/nats-io/nats-server

Is it suitable for embedded applications? (very low resources, intermittent network availability, etc)

Re:Mosquitto: An open-source MQTT broker by AkshitGarg on Wednesday September 29, 2021 @12:39PM (#28696176)
The NATS protocol [0] looks pretty simple, but is text based unlike MQTT which uses a size optimized binary protocol.

[0]: https://docs.nats.io/nats-protocol/nats-protocol

Re:Mosquitto: An open-source MQTT broker by DenseComet on Wednesday September 29, 2021 @12:50PM (#28696349)
NATS actually also has support for MQTT[0]. If you already have a deployment for queues, microservices, etc, using the NATS mqtt endpoint seems like a very good option.

[0] https://docs.nats.io/nats-server/configuration/mqtt