import io.github.macfja.obd2.elm327.Commander;
import io.github.macfja.obd2.elm327.command.*;
import io.github.macfja.obd2.command.livedata.*;

public class Example {
    Commander commander = new Commander();

    public static void main(String[] args) {
        new Example();
    }

    public Example() {
        commander.setCommunicationInterface(OBD2.getOutputStream(), OBD2.getInputStream());
        System.out.println(commander.sendCommand(new DeviceDescription()));
        // Should print something like "OBDII to RS232 Interpreter"
        System.out.println(commander.sendCommand(new EngineRPM()));
        // Should print something like "875rpm"
    }
}

import io.github.macfja.obd2.response.RawResponse;
import io.github.macfja.obd2.Commander;
import io.github.macfja.obd2.Command;
import io.github.macfja.obd2.Response;
import io.github.macfja.obd2.Unit;
import io.github.macfja.obd2.SimpleCommands;

Commander commander;

// Setup the `commander`
// [...]

Command customCommand = new Command() {
    @Override
    public String getRequest() {
        return "MyCode";
    }

    @Override
    public Response getResponse(byte[] rawResult) throws ScriptException {
        return new RawResponse(rawResult) {};
    }
};
commander.sendCommand(customCommand);

// OR

Command customCommand2 = SimpleCommands.create("My Code");
commander.sendCommand(customCommand2);