How to get Mavericks server that is connected to a UPS to restart automatically after a power outage.

This is driving me crazy. Is there anyone running Mavericks as a mission critical server on Backup Power Supplies that has a way to get the servers to restart automatically after a power outage. The UPS vendors all have software for Windows, but not Macs, and the setting in System Preferences, doesn't work with the UPS's Iv'e tried (2 different APC models (Smart and Back-UPs), one Triplite (Smart) and one CyberPower, (all claiming to be Mac compatible))

APC do apparently still do a command-line daemon (PowerChute Network Shutdown) which monitors over the network the UPS and will cleanly shutdown the Mac. For lower-end UPS devices these are typically connected via a USB cable and the built-in Apple System Preferences let you control the options - if it is a model supported. There is however a big limitation of using a USB connection which is that you can only connect a single computer to a UPS via USB and of course most companies have multiple servers.
It maybe that what is happening even if you use APC's software is the following -
Power failure detected by UPS
Signal sent to Mac
Computer does a clean shutdown
Power restored
UPS has no way to tell Mac because it is shutdown and Mac does not support 'Wake on LAN' if fully shutdown
The Mac does have an option to 'Startup automatically after a power failure'. However this might only take place if the Mac is not cleanly shutdown, it could be that if the Mac is cleanly shutdown it does not count this as a power failure. If this is correct then there is nothing that can be done as users to resolve this, the only way it could be resolved would be if Apple provided a way for a tool like APCs software to both do a clean shutdown and set a flag as this being due to a power failure so that when the Mac does detect the power being restored it triggers the Mac in to booting.
In the dim and distant past when Macs used ADB to connect keyboards and mice the ADB interface did support an external power-on signal. This does not exist for USB.
Personally I have regarded the APC software (PowerChute Network Shutdown 3.0.1) to be so badly supported and so old as to be too risky to use. It lists 10.7 and 10.8 but not 10.9 and uses Java 1.6 which itself is unsupported. There is a third-party tool you might want to look at called NUT (Network Ups Tools) see http://www.networkupstools.org
NUT is free and lets you do clever things like -
Connect a single computer via serial or USB to the UPS
Act as a 'server' over the network to other computers sharing the UPS
When power failure is detected the NUT 'server' sends a signal to the NUT 'clients' so all of them know that there is a power failure and can do their own clean shutdowns
This gets round only being able to connect a single computer via USB.

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