Setting up a Unix system to be an NTP client is generally straightforward. On those Unix platforms that include NTP in the default configuration, you may only need to make a few adjustments to NTP’s ...
I have a few dumb devices (Gemtec IoT LoraWAN gateways) on one network that rely on NTP to function correctly. After they were installed, they worked for about 1 day then stopped relaying sensor info ...