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A LWM2M client and server based on Californium (CoAP) all in one.
There is a newer version: 1.0.0-M11
/*******************************************************************************
 * Copyright (c) 2015 Sierra Wireless and others.
 * 
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * and Eclipse Distribution License v1.0 which accompany this distribution.
 * 
 * The Eclipse Public License is available at
 *    http://www.eclipse.org/legal/epl-v10.html
 * and the Eclipse Distribution License is available at
 *    http://www.eclipse.org/org/documents/edl-v10.html.
 * 
 * Contributors:
 *     Sierra Wireless - initial API and implementation
 *     Achim Kraus (Bosch Software Innovations GmbH) - add reset() for 
 *                                                     REPLACE/UPDATE implementation
 *******************************************************************************/
package org.eclipse.leshan.client.object;

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.HashMap;
import java.util.TimeZone;

import org.eclipse.leshan.client.resource.BaseInstanceEnabler;
import org.eclipse.leshan.client.resource.LwM2mInstanceEnabler;
import org.eclipse.leshan.core.model.ResourceModel.Type;
import org.eclipse.leshan.core.node.LwM2mResource;
import org.eclipse.leshan.core.response.ExecuteResponse;
import org.eclipse.leshan.core.response.ReadResponse;
import org.eclipse.leshan.core.response.WriteResponse;

/**
 * A simple {@link LwM2mInstanceEnabler} for the Device (3) object.
 */
public class Device extends BaseInstanceEnabler {

    private String manufacturer;
    private String modelNumber;
    private String serialNumber;
    private String supportedBinding;

    private String timezone = TimeZone.getDefault().getID();
    private String utcOffset = new SimpleDateFormat("X").format(Calendar.getInstance().getTime());

    public Device(String manufacturer, String modelNumber, String serialNumber, String supportedBinding) {
        this.manufacturer = manufacturer;
        this.modelNumber = modelNumber;
        this.serialNumber = serialNumber;
        this.supportedBinding = supportedBinding;
    }

    @Override
    public ReadResponse read(int resourceid) {

        switch (resourceid) {
        case 0: // manufacturer
            return ReadResponse.success(resourceid, manufacturer);

        case 1: // model number
            return ReadResponse.success(resourceid, modelNumber);

        case 2: // serial number
            return ReadResponse.success(resourceid, serialNumber);

        case 11: // error codes
            return ReadResponse.success(resourceid, new HashMap(), Type.INTEGER);

        case 14: // utc offset
            return ReadResponse.success(resourceid, utcOffset);

        case 15: // timezone
            return ReadResponse.success(resourceid, timezone);

        case 16: // supported binding and modes
            return ReadResponse.success(resourceid, supportedBinding);

        default:
            return super.read(resourceid);
        }
    }

    @Override
    public WriteResponse write(int resourceid, LwM2mResource value) {

        switch (resourceid) {

        case 14: // utc offset
            utcOffset = (String) value.getValue();
            fireResourcesChange(resourceid);
            return WriteResponse.success();

        case 15: // timezone
            timezone = (String) value.getValue();
            fireResourcesChange(resourceid);
            return WriteResponse.success();

        default:
            return super.write(resourceid, value);
        }
    }

    @Override
    public ExecuteResponse execute(int resourceid, String params) {

        if (resourceid == 4) { // reboot
            return ExecuteResponse.internalServerError("not implemented");
        } else {
            return super.execute(resourceid, params);
        }
    }

    @Override
    public void reset(int resourceid) {
        switch (resourceid) {
        case 14:
            utcOffset = new SimpleDateFormat("X").format(Calendar.getInstance().getTime());
            break;
        case 15:
            timezone = TimeZone.getDefault().getID();
            break;
        default:
            super.reset(resourceid);
        }
    }

}