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QAbstractSocket strange behavior when connection is closed from server side

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  • L Offline
    L Offline
    leonardooyama
    wrote on last edited by
    #1

    I have posted a question at Stackoverflow, but nobody answered to my question. My post is too long, so I will not copy it in here.

    Here is the link to my post.

    https://stackoverflow.com/questions/45830835/qabstractsocket-strange-behavior-when-connection-is-closed-from-server-side

    Please, let me know what's wrong with my implementation.

    Leonardo Seiji Oyama

    raven-worxR 1 Reply Last reply
    0
    • L leonardooyama

      I have posted a question at Stackoverflow, but nobody answered to my question. My post is too long, so I will not copy it in here.

      Here is the link to my post.

      https://stackoverflow.com/questions/45830835/qabstractsocket-strange-behavior-when-connection-is-closed-from-server-side

      Please, let me know what's wrong with my implementation.

      raven-worxR Offline
      raven-worxR Offline
      raven-worx
      Moderators
      wrote on last edited by raven-worx
      #2

      @leonardooyama said in QAbstractSocket strange behavior when connection is closed from server side:

      Please, let me know what's wrong with my implementation.

      nothing is wrong with your implementation. This is rather normal behavior (unfortunately).
      You would receive a disconnect after quite some time - when the next TCP KeepAlive packet is send.

      For MS Windows see this for example.

      When you for example would send a periodic "KeepAlive" data message or implement a polling mechanism over the socket you would receive the disconnect a few seconds after it really has been disconnected (this OS dependant). How much time later depends on the OS which retries the connection a few times before finally concluding that the connection is really torn down.

      So simply try to send data (for example a single control character to keep the footprint low) every 500ms and you will notice what i've described above.

      --- SUPPORT REQUESTS VIA CHAT WILL BE IGNORED ---
      If you have a question please use the forum so others can benefit from the solution in the future

      L 1 Reply Last reply
      1
      • raven-worxR raven-worx

        @leonardooyama said in QAbstractSocket strange behavior when connection is closed from server side:

        Please, let me know what's wrong with my implementation.

        nothing is wrong with your implementation. This is rather normal behavior (unfortunately).
        You would receive a disconnect after quite some time - when the next TCP KeepAlive packet is send.

        For MS Windows see this for example.

        When you for example would send a periodic "KeepAlive" data message or implement a polling mechanism over the socket you would receive the disconnect a few seconds after it really has been disconnected (this OS dependant). How much time later depends on the OS which retries the connection a few times before finally concluding that the connection is really torn down.

        So simply try to send data (for example a single control character to keep the footprint low) every 500ms and you will notice what i've described above.

        L Offline
        L Offline
        leonardooyama
        wrote on last edited by
        #3

        @raven-worx Thanks for answering my question!

        Leonardo Seiji Oyama

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