Ultimately it is not a good design to require log off.  What if the
user goes into a building where there is no reception and it is not
possible to contact the server?

On Dec 4, 12:33 am, Zhihong GUO <gzhh...@gmail.com> wrote:
> Hi All,
>
> My application want to know the device is to be power off, so that it can
> send out the logout message to the server.
>
> How to do that?
>
> Thanks a lot.
>
> James

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