Without an internet connection, how does it keep track of time?

The Waiter ECC utilizes its own Real Time Clock (RTC) module to keep track of time. Most installations are mobile, crossing time zones, passing in-to and out-of time zones, daylight savings times, etc. Since we can’t depend on an internet connection or other convenient way to account for the vast number of possibilities, we decided to leave it up to the operator to set the correct date/time.

The RTC module is located on the controller circuit card and reports current time to the MQTT server once a minute. The RTC has a battery backup so it keeps time even when no power is applied. The battery is good for 5-6 years and is easy to replace.