What is the data transfer rate?

The transmission speed via Bluetooth Low Energy protocol is not fast, the transmission is somewhere in the region of 10 packets per second.

Is this plugin suitable for creating local multiplayer?

Yes, this plugin is applicable to devices on Android and IOS platforms that have Bluetooth LE, today it is 99% of devices (in iOS starting from 4s, and in Android from 5.0).

For which games is this plugin applicable?

This plugin is applicable to games that do not require fast data transfer. For games that need to transfer data between devices very quickly and a lot, this plugin will not work. Examples of the genre where it can be applied: step-by-step strategies.