bifystatechangeI

I couldn't find any information on "bifystatechangeI". However, I think you may be referring to "Bisync" or "Batch Intermediate Synchronization" may not directly relate, but "bifromsynchronous to asynchronous" or a prefix "bi" as a short form and "ynchronous" a word indicating a real time process I did find the term "bisynchronous" which is even more related.

Bisynchronous communication involves the exchange of data between two devices, with each device generating and receiving data simultaneously. The term "bi" indicates a two-way process or simultaneous communication.

A primer on Bisync might indicate: The Bisync protocol is a standards-based data communications protocol developed in the 1960s. It is used for synchronous data transfer between devices over a serial connection. Bisync allows devices to exchange data at the same time, with each device sending and receiving data in parallel. This results in more efficient data transfer compared to traditional half-duplex protocols, where data is transmitted one way at a time.

Bisync is widely used in industrial automation and other high-speed serial data transfer applications.