https://networkupstools.org/ddl/Advice/
Network UPS Tools - Advice
Power Devices support
network ups toolsadvice
https://manpages.org/upsclient/3
man upsclient (3): Network UPS Tools client access library
man upsclient (3): The Network UPS Tools (NUT) upsclient library provides a number of useful functions for programs to use when communicating with upsd(8)....
network ups toolsmanclientaccesslibrary
https://networkupstools.org/historic/v2.8.3/protocols/sec-protocol.html
Network UPS Tools - UPS Standard Protocol System Enhancement Corporation
Power Devices support
network ups toolsprotocol systemstandardenhancementcorporation