What message queues are supported by Mosqitto (http://mosquitto.org/)? Also I want to know in MQTT protocol, a different message queue is created for each topic or it can be done without that in case of memory constraints.
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2 Answers
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Mosquitto only supports MQTT. MQTT doesn't have the concept of what is normally considered a queue. Having said that, each client has a queue of messages that will be delivered to it. The number of messages in the client queue can be limited with a configuration option. In the future there will be an option to globally limit heap usage and hence the overall length of queues.
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Messages may be queued by a broker like Mosquitto in different ways based on the Quality of Service (QoS) specified by the publisher.
See http://2lemetry.com/2013/08/22/mqtt-in-a-nutshell/ for a good description of MQTT QoS.
