[mythtv] System-wakeup

[Dan M]

Chris, you are partialy right on the packet to the mac address issue.  I 
WOL enabled nic will wake up the host when it gets a *magic packet* 
addressed to its mac address.  Do a google on magic packet if you 
want/need more info on it.

-dan

Chris Palmer wrote:

>Christian Hoenig wrote
>  
>
>>>>You then first try to contact them, and if that fails, you try to
>>>>wake them up.
>>>>        
>>>>
>>>I don't think you have that kind of control.  When you attempt
>>>to make contact, WoL (if enabled) would cause the target machine
>>>to wake because of the incoming packets.  Either you send a packet
>>>to that host or you don't.
>>>      
>>>
>>I'm not quite sure, if I missunderstand you, or you missunderstand WOL.
>>If you enable wol on a network adapter, it only wakes up, if you send the 
>>'magic' paket to this adapter. It does not wake up, if you send any paket to 
>>that device!
>>    
>>
>
>maybe I misunderstand WOL, then.  I was under the impression that
>it would automatically wake the host if it saw a packet that was
>addressed to its mac address.
>
>  
>
>>>Another issue that may need to be looked at is that the frontend
>>>doesn't currently attempt to re-establish a connection to the
>>>backend, after communication is lost, which is annoying in
>>>general, but could make it impossible to implement this idea.
>>>      
>>>
>>I don't see the issue with that thing? :-)
>>What do you think is the problem?
>>    
>>
>
>I don't know if there has been work on it this week (still catching
>up on the forums), but if the frontend and backend stopped responding
>to each other (different hosts, or same), then the frontend never
>re-establishes its connection with the backend.  The only way to
>make things work again is to restart the frontend. 
>
>So... it all depends on your shutdown/sleep/bootup/wakeup flow
>on how this will work.  If you're doing all this wakeup stuff
>while attempting your initial "connect" from the frontend to 
>the backend, then you will not run into this problem.  If the
>backend sleeps on you when your frontend is still up (but idle)
>then "re-connection" needs to be negotiated.
>
>Maybe I should drop out of this thread, since I don't know 
>what the runtime flow looks like for your implementation of
>suspend/wakeup, and I'm just confusing myself... :)
>
>heh...  if you get it working, and it applies to my setup,
>I'll be glad to test it... ;)
>
>-Chris
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>
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