MQ

MQ

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  • 1.  How do you contrast MQTT with WebSockets?

    Posted Mon February 04, 2013 11:21 AM
    This question came from the January 24th webcast "Extend your WebSphere MQ messaging backbone to the world of mobile:"

    How do you contrast MQTT with WebSockets? 


  • 2.  How do you contrast MQTT with WebSockets?

    Posted Sun February 17, 2013 08:33 AM
    As its name suggests, Websockets provides a web browser with a socket-like TCP/IP connection to a web server. You can program to this directly if you like (just like you can program to a TCP/IP sockets library when running outside a browser) but you can also run higher-level protocols such as MQTT over websockets.

    So your question is similar to asking "what's the difference between JMS or MQ and TCP/IP?".  The quick answer, in the case of MQTT, is that the MQTT client and server provide some additional capabilities, over and above those provided by websockets, such as:
    - store and forward decoupling of sending and receiving applications
    - publish/subscribe decoupling (so you can do one->many messaging)
    - reliable message delivery
    - "last will and testament" - alerting if the connection to the client is lost unexpectedly