Usage

SimpleJavaBLE exposes SimpleBLE to JVM applications through a Java API backed by the native SimpleBLE library.

Requirements

• JDK 17 or newer.
• CMake 3.21 or newer.
• The platform requirements from Installation.
• A native library artifact for the platform and architecture where the JVM runs.

Build from source

From a local checkout:

cd simplejavable/java
../../utils/gradle/gradlew build -PbuildFromCMake

This builds the Java classes and asks Gradle to build the native library through the CMake project under simplejavable/cpp.

The generated JAR is written under:

simplejavable/java/build/libs

Native library loading

SimpleJavaBLE loads the simplejavable native library at runtime. The Gradle build can package native libraries into the JAR, or you can provide native libraries separately and make them visible to the JVM.

If you already built native libraries elsewhere, pass their location to Gradle:

../../utils/gradle/gradlew build -PnativeLibPath=/path/to/native/libs

First scan

import org.simplejavable.Adapter;
import org.simplejavable.Peripheral;

import java.util.List;

public class ScanExample {
    public static void main(String[] args) throws Exception {
        List<Adapter> adapters = Adapter.getAdapters();
        if (adapters.isEmpty()) {
            System.err.println("No Bluetooth adapters found.");
            return;
        }

        Adapter adapter = adapters.get(0);
        adapter.scanFor(5000);

        for (Peripheral peripheral : adapter.scanGetResults()) {
            System.out.println(peripheral.getIdentifier() + " [" + peripheral.getAddress() + "]");
        }
    }
}

For a fuller walkthrough, see Quickstart and the SimpleJavaBLE Examples.