MQTT with Mosquitto

Question

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.

Answer 1

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.