This ESP8266/Arduino test application shows the usage of TWI master libraries.
It is a serial console-based application that runs a 3-time loop that flashes, deletes and runs a user application on several Tiny85's (bare chips or Digispark) running the Timonel bootloader.
The application has been tested on ESP-01 and NodeMCU modules. It is compiled and flashed to the device using PlatformIO over VS Code. The arduino folder contains the same application, adapted to be used through the Arduino IDE.