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package com.diozero.api.imu;
/*
* #%L
* Organisation: diozero
* Project: Device I/O Zero - Core
* Filename: MqttConstants.java
*
* This file is part of the diozero project. More information about this project
* can be found at http://www.diozero.com/
* %%
* Copyright (C) 2016 - 2020 diozero
* %%
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
* #L%
*/
public interface MqttConstants {
static final String MQTT_SERVER_OPTION = "mqttServer";
static final String MQTT_TOPIC_IMU = "IMU/MPU9150";
static final String MQTT_TOPIC_COMPASS = MQTT_TOPIC_IMU + "/" + "Compass";
static final String MQTT_TOPIC_ACCEL = MQTT_TOPIC_IMU + "/" + "Accel";
static final String MQTT_TOPIC_GYRO = MQTT_TOPIC_IMU + "/" + "Gyro";
static final String MQTT_TOPIC_QUAT = MQTT_TOPIC_IMU + "/" + "Quat";
static final String MQTT_TOPIC_EULER_ANGLE = MQTT_TOPIC_IMU + "/" + "EulerAngle";
/*
* Quality of Service 0 - indicates that a message should be delivered at most once (zero or one times).
* The message will not be persisted to disk, and will not be acknowledged across the network. This QoS
* is the fastest, but should only be used for messages which are not valuable - note that if the server
* cannot process the message (for example, there is an authorization problem), then an
* MqttCallback.deliveryComplete(IMqttDeliveryToken). Also known as "fire and forget".
*/
static final int MQTT_QOS_AT_MOST_ONCE = 0;
/*
* Quality of Service 1 - indicates that a message should be delivered at least once (one or more times).
* The message can only be delivered safely if it can be persisted, so the application must supply a means
* of persistence using MqttConnectOptions. If a persistence mechanism is not specified, the message will
* not be delivered in the event of a client failure. The message will be acknowledged across the network.
* This is the default QoS.
*/
static final int MQTT_QOS_AT_LEAST_ONCE = 1;
/*
* Quality of Service 2 - indicates that a message should be delivered once. The message will be persisted
* to disk, and will be subject to a two-phase acknowledgement across the network. The message can only be
* delivered safely if it can be persisted, so the application must supply a means of persistence using
* MqttConnectOptions. If a persistence mechanism is not specified, the message will not be delivered in
* the event of a client failure.
* If persistence is not configured, QoS 1 and 2 messages will still be delivered in the event of a
* network or server problem as the client will hold state in memory. If the MQTT client is shutdown or
* fails and persistence is not configured then delivery of QoS 1 and 2 messages can not be maintained as
* client-side state will be lost.
*/
static final int MQTT_QOS_ONCE = 2;
}
