One codebase, one config file, many behaviours!

• Leftmost: WROVER KIT v4.2 + GPS + RTC
• Middle: M5Stack Fire
• Rightmost: Odroid-Go

The WROVER KIT keeps track of time with the GPS and the RTC module.

A BLE Characteristic notification is used to keep other peers in sync.

Source: https://github.com/tobozo/ESP32-BLECollector (use the "unstable" branch or wait for the next release)