java-obd-adapter

java-obd-adapter - OBD-II Java Adapter API

Requisites

• Java 7
• Maven 3

Supported Commands

AT Commands

• AT Z - AT Reset
• AT SP - AT Select Protocol
• AT D - AT Defaults
• AT E - AT Set Echo On/Off
• AT H - AT Set Headers On/Off
• AT L - AT Set Linefeed On/Off
• AT M - AT Set Memory On/Off
• AT S - AT Set Spaces On/Off

Diagnostic Commands

• 01 04 - ENGINE_LOAD
• 01 05 - ENGINE_COOLANT_TEMPERATURE
• 01 0C - ENGINE_RPM
• 01 0D - VEHICLE_SPEED
• 01 0F - INTAKE_AIR_TEMPERATURE
• 01 10 - MASS_AIR_FLOW
• 01 11 - THROTTLE_POSITION_PERCENTAGE
• 01 1F - ENGINE_RUN_TIME
• 01 2F - FUEL_LEVEL
• 01 46 - AMBIENT_AIR_TEMPERATURE
• 01 51 - FUEL_TYPE
• 01 5E - FUEL_CONSUMPTION_1
• 01 5F - FUEL_CONSUMPTION_2

Usage

<dependency>
  <groupId>com.devesion.commons.obd</groupId>
  <artifactId>obd-adapter</artifactId>
  <version>1.0-SNAPSHOT</version>
</dependency>

    private void invokeInitialCommands() {
        invokeCommandQuietly(new ResetCommand());
        invokeCommand(new SetEchoCommand(false));
        invokeCommand(new SetLineFeedCommand(false));
        invokeCommand(new SetHeadersCommand(false));
        invokeCommand(new SetSpacesCommand(false));
        invokeCommand(new AdaptiveTimeoutProtocolCommand());
        invokeCommand(new SelectProtocolCommand());
    }

    private int readEngineRpm() {
        EngineRpmCommand engineRpmCommand = new EngineRpmCommand();
        invokeCommand(engineRpmCommand);
        return engineRpmCommand.getValue().getIntValue();
    }

    private int readVehicleSpeed() {
        SpeedCommand speedCommand = new SpeedCommand();
        invokeCommand(speedCommand);
        return speedCommand.getValue().getIntValue();
    }

    private float readThrottlePositionPercentage() {
        ThrottlePositionCommand throttlePositionCommand = new ThrottlePositionCommand();
        invokeCommand(throttlePositionCommand);
        return throttlePositionCommand.getValue().getIntValue();
    }

    private double readMassAirFlow() {
        MassAirFlowCommand massAirFlowObdCommand = new MassAirFlowCommand();
        invokeCommand(massAirFlowObdCommand);
        return massAirFlowObdCommand.getValue().getFloatValue();
    }

    private void invokeCommand(ObdCommand command) {
        try {
            CommandInvoker commandInvoker = createCommandInvoker();
            log.info("invoking command {}", command);
            commandInvoker.invoke(command);
        } catch (Exception e) {
            throw new DiagnosticStatusReadException(e);
        }
    }

    private void invokeCommandQuietly(ObdCommand command) {
        CommandInvoker commandInvoker = createCommandInvoker();
        log.info("invoking command {}", command);
        commandInvoker.invokeQuietly(command);
    }

    private CommandInvoker createCommandInvoker(InputStream inputStream, OutputStream outputStream) {
        ObdLink obdLink = new ElmLink(inputStream, outputStream);
        return new CommandInvoker(obdLink);
    }