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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) 2013-2015 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
 *     Bosch Software Innovations GmbH - extension of ticket based asynchronous call.
 *******************************************************************************/
package org.eclipse.leshan.server.request;

import org.eclipse.leshan.core.node.codec.CodecException;
import org.eclipse.leshan.core.request.DownlinkRequest;
import org.eclipse.leshan.core.request.exception.RequestCanceledException;
import org.eclipse.leshan.core.response.ErrorCallback;
import org.eclipse.leshan.core.response.LwM2mResponse;
import org.eclipse.leshan.core.response.ResponseCallback;
import org.eclipse.leshan.server.registration.Registration;

public interface LwM2mRequestSender {

    /**
     * Sends a Lightweight M2M request synchronously. Will block until a response is received from the remote client.
     * 
     * @param destination the remote client
     * @param request the request to send to the client
     * @param timeout the request timeout in millisecond
     * @return the response or null if the timeout expires (given parameter or CoAP timeout).
     * 
     * @throws CodecException if request payload can not be encoded.
     * @throws InterruptedException if the thread was interrupted.
     */
     T send(Registration destination, DownlinkRequest request, Long timeout)
            throws InterruptedException;
    
    /**
     * Sends a Lightweight M2M request asynchronously.
     * 
     * @param destination the remote client
     * @param request the request to send to the client
     * @param responseCallback a callback called when a response is received (successful or error response)
     * @param errorCallback a callback called when an error or exception occurred when response is received
     * 
     * @throws CodecException if request payload can not be encoded.
     */
     void send(Registration destination, DownlinkRequest request,
            ResponseCallback responseCallback, ErrorCallback errorCallback);

    /**
     * cancel all pending messages for a LWM2M client identified by the registration identifier. In case a client
     * de-registers, the consumer can use this method to cancel all messages pending for the given client.
     * 
     * @param registration client registration meta data of a LWM2M client.
     * @throws RequestCanceledException when a request is already being sent in CoAP, then the exception is thrown.
     */
    void cancelPendingRequests(Registration registration);
}