I have released a new open source framework, uEcho for Python. The uEcho is a portable and cross platform development framework for ECHONETLite developers. ECHONETLite is an open standard specification for IoT devices in Japan, it specifies more than 100 IoT devices such as crime prevention sensor, air conditioner and refrigerator.
The uEcho is designed for easy development of ECHONET Lite devices and controllers on Raspberry Pi and has been tested on Raspberry Pi OS too.