XPost: alt.os.linux, sci.electronics.repair   
   From: jasen@xnet.co.nz   
      
   On 2017-11-15, Carlos E.R.  wrote:   
   > On 2017-11-15 08:25, ATANARJUAT wrote:   
   >> On Wed, 15 Nov 2017 07:22:29 -0000 (UTC), Blake Snyder wrote   
   >>  in response to Blake Snyder    
   >>   
   >>> Klugey approach?   
   >>>   
   >>> Set a WatchDog Timer reboot.   
   >>>   
   >>> Specify an IP that won't respond to pings, set up the WatchDog timer to   
   >>> ping it every 24*60*60 seconds, with a fail count of 7. (or suitable   
   >>> numbers that the GUI will accept).   
   >>   
   >> You could even have it ping a machine on your network somewhere that you   
   >> could take off-line when you wanted to reboot everything.   
   >   
   > Do you know of a reasonably cheap hardware device that can monitor   
   > something on the network, and powercycle it when needed? A watchdog that   
   > acts on a hung device, say.   
   >   
   > I know one or two, but they are expensive.   
   > A timer reboot is too aggressive when a reboot is not needed.   
      
   I used transitor driven relay wired to the RTS line of a serial port.   
   open the serial device and the relay switches on, I used the normally-   
   closed contacts to interrupt the DC supply to the flakey device (said   
   DC supply also powered the relay)   
      
   A cron job would check the status of the internet and do "sleep 10 <   
   /dev/ttyS0" when a hard reboot was needed.   
      
   --   
   This email has not been checked by half-arsed antivirus software   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)