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[m2m-iwg] General MQTT Protocol Question

Hi, all.

 

We’re experimenting with and exploring MQTT and had a couple of questions.  Might as well go right to the experts!

 

·         Does the protocol indicate that a “subscribe” request will always trigger an initial notification of the last known value for a topic?

·         If not, is there any way to force a synchronization from the client?

·         Are there any thoughts to supporting an alternative, more browser-friendly client protocol layer (probably on top of web sockets) and using JSON as the wire format?

·         Are there any testing metrics available that give some guidelines/limitations for scalability and performance? (impact of # of topics, # of clients, # of connections, frequency of publications/notifications, etc.)

·         Any known implementations with clustered servers for failover/scalability purposes?

·         Any thoughts to discovery APIs to enable client(s) to discover available topics?

 

Thanks,

 

Rick Bullotta

ThingWorx

 


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