BlueUnity-Kotline-v0.0.1

New in the Kotlin Version

This Kotlin-based rewrite introduces major improvements over the previous Java implementation.

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New Feature: Device-to-Device Communication

BlueUnity now supports direct Bluetooth Classic communication between two Android devices.

• One Android device can act as the server (discoverable mode)
• Other Android device can connect as the client

This capability did not exist in the Java version, which only supported device-to-module connections (ESP32, HC-05/06, BM78…).

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New Feature: JavaProxy-Based Callback System

The Java version relied on Unity’s SendMessage, which required GameObject lookups and string-based messaging.

The Kotlin version introduces a JavaProxy callback API.

Available Callbacks

• onDiscoveryStarted()
• onDiscoveryDeviceFound(name, address)
• onDiscoveryFinished()
• onConnecting(address)
• onConnected(address)
• onDisconnected(address)
• onDataReceived(data)
• onDataNotSent(data)
• onError(error)

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Kotlin ByteArray → Unity byte[] Conversion

Kotlin uses signed bytes (Byte, -128 to 127), while Unity uses unsigned bytes (byte, 0 to 255).

In this new version:

• All data received from Android arrives as signed ByteArray
• A conversion is automatically handled on the Unity side