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IBM Watson IoT client library to simplify device/gateway/application interactions with the IoT Platform
/**
*****************************************************************************
* Copyright (c) 2016 IBM Corporation and other Contributors.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Sathiskumar Palaniappan - Initial Contribution
*****************************************************************************
*/
package com.ibm.iotf.client.gateway;
import java.nio.charset.Charset;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map.Entry;
import java.util.Properties;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.eclipse.paho.client.mqttv3.IMqttDeliveryToken;
import org.eclipse.paho.client.mqttv3.MqttAsyncClient;
import org.eclipse.paho.client.mqttv3.MqttCallback;
import org.eclipse.paho.client.mqttv3.MqttClient;
import org.eclipse.paho.client.mqttv3.MqttException;
import org.eclipse.paho.client.mqttv3.MqttMessage;
import org.eclipse.paho.client.mqttv3.MqttPersistenceException;
import org.eclipse.paho.client.mqttv3.MqttSecurityException;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.ibm.iotf.client.AbstractClient;
import com.ibm.iotf.client.api.APIClient;
import com.ibm.iotf.util.LoggerUtility;
/**
* A client, used by Gateway, that simplifies the Gateway interactions with IBM Watson IoT Platform.
*
* Gateways are a specialized class of devices in Watson IoT Platform which serve as access points to the
* Watson IoT Platform for other devices. Gateway devices have additional permission when compared to
* regular devices and can perform the following functions:
*
*
* - Register new devices to Watson IoT Platform
*
- Send and receive its own sensor data like a directly connected device,
*
- Send and receive data on behalf of the devices connected to it
*
- Run a device management agent, so that it can be managed, also manage the devices connected to it
*
*
* Refer to the documentation for more information about the
* Gateway support in Watson IoT Platform.
*
* This is a derived class from AbstractClient.
*/
public class GatewayClient extends AbstractClient implements MqttCallback{
private static final String CLASS_NAME = GatewayClient.class.getName();
private static final Pattern GATEWAY_NOTIFICATION_PATTERN = Pattern.compile("iot-2/type/(.+)/id/(.+)/notify");
private static final Pattern GATEWAY_COMMAND_PATTERN = Pattern.compile("iot-2/type/(.+)/id/(.+)/cmd/(.+)/fmt/(.+)");
private GatewayCallback gwCommandCallback = null;
private HashMap subscriptions = new HashMap();
private APIClient apiClient = null;
/**
* Create a Gateway client for the IBM Watson IoT Platform using the properties file passed. The
* properties must have the following definitions,
*
*
* - org - Your organization ID.
*
- type - The type of your Gateway device.
*
- id - The ID of your Gateway.
*
- auth-method - Method of authentication (The only value currently supported is "token").
*
- auth-token - API key token.
*
* @param options The Properties object creates definitions which are used to interact
* with the Watson Internet of Things Platform module.
*
* @throws Exception Failure in parsing the properties passed
*/
public GatewayClient(Properties options) throws Exception {
super(options);
if(getOrgId()==null){
throw new Exception("Invalid Auth Key");
} else if(getOrgId().equalsIgnoreCase("quickstart")) {
throw new Exception("There is no quickstart support for Gateways");
}
this.clientId = "g" + CLIENT_ID_DELIMITER + getOrgId() +
CLIENT_ID_DELIMITER + this.getGWDeviceType()
+ CLIENT_ID_DELIMITER + getGWDeviceId();
if (getAuthMethod() == null) {
this.clientUsername = null;
this.clientPassword = null;
}
else if (!getAuthMethod().equals("token")) {
throw new Exception("Unsupported Authentication Method: " + getAuthMethod());
}
else {
// use-token-auth is the only authentication method currently supported
this.clientUsername = "use-token-auth";
this.clientPassword = getAuthToken();
}
createClient(this);
options.setProperty("auth-method", "gateway");
this.apiClient = new APIClient(options);
}
/**
* This constructor allows external user to pass the existing MqttAsyncClient
* @param mqttAsyncClient MqttAsyncClient with the Watson IoT Platform connectivity details
*/
protected GatewayClient(MqttAsyncClient mqttAsyncClient) {
super(mqttAsyncClient);
}
/**
* This constructor allows external user to pass the existing MqttClient
* @param mqttClient MqttClient with the Watson IoT Platform connectivity details
*/
protected GatewayClient(MqttClient mqttClient) {
super(mqttClient);
}
/**
* Returns the {@link com.ibm.iotf.client.api.APIClient} that allows the users to interact with
* Watson IoT Platform API's to perform one or more operations like, registering a device,
* getting the list of devices connected through the Gateway and etc..
*
* @return APIClient
*/
public APIClient api() {
return this.apiClient;
}
/**
* Returns the IBM Watson IoT Platform Organization ID for this client.
*
* @return orgid Organization ID
*/
public String getOrgId() {
// Check if org id is provided by the user
String orgid = super.getOrgId();
if(orgid == null || orgid.equals("")) {
String authKeyPassed = getAuthKey();
if(authKeyPassed != null && ! authKeyPassed.trim().equals("") && ! authKeyPassed.equals("quickstart")) {
if(authKeyPassed.length() >=8){
return authKeyPassed.substring(2, 8);}
else {
return null;
}
} else {
return "quickstart";
}
}
return orgid;
}
/*
* old style - id
* new style - Device-ID
*/
public String getGWDeviceId() {
String id = null;
id = options.getProperty("Gateway-ID");
if(id == null) {
return getDeviceId();
}
return trimedValue(id);
}
public String getGWDeviceType() {
String type = null;
type = options.getProperty("Gateway-Type");
if(type == null) {
type = options.getProperty("type");
}
if(type == null) {
type = options.getProperty("Device-Type");
}
return trimedValue(type);
}
/**
* Accessor method to retrieve auth key
* @return authKey
* String authKey
*/
private String getAuthKey() {
String authKeyPassed = options.getProperty("auth-key");
if(authKeyPassed == null) {
authKeyPassed = options.getProperty("API-Key");
}
return trimedValue(authKeyPassed);
}
/**
* Connects the Gateway to IBM Watson Internet of Things Platform.
* After the successful connection to the IBM Watson IoT Platform,
* the Gateway client can perform the following operations,
*
*
* - Publish events for itself and on behalf of devices connected behind the Gateway.
*
- Subscribe to commands for itself and on behalf of devices behind the Gateway.
*
*
*
* The GatewayClient retries when there is a connect exception.
*
* This method does not retry when the following exceptions occur.
*
*
* - MqttSecurityException - One or more credentials are wrong
*
- UnKnownHostException - Host doesn't exist. For example, a wrong organization name is used to connect.
*
*
* @throws MqttException see above
**/
public void connect() throws MqttException {
super.connect(true);
subscribeToGatewayCommands();
}
/**
* Connects the Gateway to IBM Watson Internet of Things Platform.
* After the successful connection to the IBM Watson IoT Platform,
* the Gateway client can perform the following operations,
*
*
* - Publish events for itself and on behalf of devices connected behind the Gateway.
*
- Subscribe to commands for itself and on behalf of devices behind the Gateway.
*
*
* The GatewayClient retries when there is a connect exception based on the
* value set in retry parameter.
*
* This method does not retry when the following exceptions occur.
*
*
* - MqttSecurityException - One or more credentials are wrong
*
- UnKnownHostException - Host doesn't exist. For example, a wrong organization name is used to connect.
*
*
* @param autoRetry - tells whether to retry the connection when the connection attempt fails.
* @throws MqttException see above
**/
public void connect(boolean autoRetry) throws MqttException {
super.connect(autoRetry);
subscribeToGatewayCommands();
}
/**
* Connects the Gateway to IBM Watson Internet of Things Platform.
* After the successful connection to the IBM Watson IoT Platform,
* the Gateway client can perform the following operations,
*
*
* - Publish events for itself and on behalf of devices connected behind the Gateway.
*
- Subscribe to commands for itself and on behalf of devices behind the Gateway.
*
*
* The GatewayClient retries when there is a connect exception based on the
* value set in retry parameter.
*
* This method does not retry when the following exceptions occur.
*
*
* - MqttSecurityException - One or more credentials are wrong
*
- UnKnownHostException - Host doesn't exist. For example, a wrong organization name is used to connect.
*
*
* @param numberOfRetryAttempts - How many number of times to retry when there is a failure in connecting to Watson
* IoT Platform.
* @throws MqttException see above
**/
@Override
public void connect(int numberOfRetryAttempts) throws MqttException {
super.connect(numberOfRetryAttempts);
subscribeToGatewayCommands();
}
/**
* While Gateway publishes events on behalf of the devices connected behind,
* the Gateway can publish its own events as well. This method publishes the event with the
* specified name and specified QOS.
*
* Note that data is published at Quality of Service (QoS) 0, which means that
* a successful send does not guarantee receipt even if the publish has been successful.
*
* @param event
* Name of the dataset under which to publish the data
* @param data
* Object to be added to the payload as the dataset
* @return Whether the send was successful.
*/
public boolean publishGatewayEvent(String event, Object data) {
return publishDeviceEvent(this.getGWDeviceType(), this.getGWDeviceId(), event, data, 0);
}
/**
* While Gateway publishes events on behalf of the devices connected to it,
* the Gateway can publish its own events as well. This method publishes event with the
* specified name and specified QOS.
*
* This method allows QoS to be passed as an argument
*
* @param event
* Name of the dataset under which to publish the data
* @param data
* Object to be added to the payload as the dataset
* @param qos
* Quality of Service - should be 0, 1 or 2
* @return Whether the send was successful.
*/
public boolean publishGatewayEvent(String event, Object data, int qos) {
return publishDeviceEvent(this.getGWDeviceType(), this.getGWDeviceId(), event, data, qos);
}
/**
* Publish the event on behalf of a device to the IBM Watson IoT Platform.
* Note that data is published at Quality of Service (QoS) 0, which means that a successful send does not guarantee
* receipt even if the publish is successful.
*
* @param deviceType
* object of String which denotes deviceType
* @param deviceId
* object of String which denotes deviceId
* @param event
* object of String which denotes event
* @param data
* Payload data
* @return Whether the send was successful.
*/
public boolean publishDeviceEvent(String deviceType, String deviceId, String event, Object data) {
return publishDeviceEvent(deviceType, deviceId, event, data, 0);
}
/**
* Publish an event on the behalf of a device to the IBM Watson IoT Platform.
*
* @param deviceType
* object of String which denotes deviceType
* @param deviceId
* object of String which denotes deviceId
* @param event
* object of String which denotes event
* @param data
* Payload data
* @param qos
* Quality of Service, in int - can have values 0,1,2
* @return Whether the send was successful.
*/
public boolean publishDeviceEvent(String deviceType, String deviceId, String event, Object data, int qos) {
if (!isConnected()) {
return false;
}
final String METHOD = "publishEvent(5)";
JsonObject payload = new JsonObject();
String timestamp = ISO8601_DATE_FORMAT.format(new Date());
payload.addProperty("ts", timestamp);
JsonElement dataElement = gson.toJsonTree(data);
payload.add("d", dataElement);
String topic = "iot-2/type/" + deviceType + "/id/" + deviceId + "/evt/" + event + "/fmt/json";
LoggerUtility.fine(CLASS_NAME, METHOD, "Topic = " + topic);
LoggerUtility.fine(CLASS_NAME, METHOD, "Payload = " + payload.toString());
MqttMessage msg = new MqttMessage(payload.toString().getBytes(Charset.forName("UTF-8")));
msg.setQos(qos);
msg.setRetained(false);
try {
mqttAsyncClient.publish(topic, msg).waitForCompletion();
} catch (MqttPersistenceException e) {
e.printStackTrace();
return false;
} catch (MqttException e) {
e.printStackTrace();
return false;
}
return true;
}
/*
* This method reconnects when the connection is lost due to n/w interruption
*/
protected void reconnect() {
try {
super.connect(true);
} catch (MqttException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
subscribeToGatewayCommands();
}
private void subscribeToGatewayCommands() {
subscribeToDeviceCommands(this.getGWDeviceType(), this.getGWDeviceId());
}
/**
* Subscribe to device commands, on the behalf of a device, to the IBM Watson IoT Platform.
* Note that the, Quality of Service is set to 0.
* This method subscribes to all commands, for a given device type and device id.
* @param deviceType
* object of String which denotes deviceType
* @param deviceId
* object of String which denotes deviceId
*/
public void subscribeToDeviceCommands(String deviceType, String deviceId) {
subscribeToDeviceCommands(deviceType, deviceId, "+", 0);
}
/**
* Unsubscribe from device commands, on the behalf of a device, from the IBM Watson IoT Platform.
*
* @param deviceType
* object of String which denotes deviceType
* @param deviceId
* object of String which denotes deviceId
*/
public void unsubscribeFromDeviceCommands(String deviceType, String deviceId) {
unsubscribeFromDeviceCommands(deviceType, deviceId, "+");
}
/**
* Subscribe to device commands, on the behalf of a device, to the IBM Watson IoT Platform.
* Quality of Service is set to 0.
*
* @param deviceType
* object of String which denotes deviceType
* @param deviceId
* object of String which denotes deviceId
* @param command
* object of String which denotes command
*/
public void subscribeToDeviceCommands(String deviceType, String deviceId, String command) {
subscribeToDeviceCommands(deviceType, deviceId, command, 0);
}
/**
* Subscribe to device commands, on the behalf of a device, to the IBM Watson IoT Platform.
*
* @param deviceType
* object of String which denotes deviceType
* @param deviceId
* object of String which denotes deviceId
* @param command
* object of String which denotes command
* @param qos
* Quality of Service, in int - can have values 0,1,2
*/
public void subscribeToDeviceCommands(String deviceType, String deviceId, String command, int qos) {
try {
String newTopic = "iot-2/type/"+deviceType+"/id/"+deviceId+"/cmd/" + command + "/fmt/json";
subscriptions.put(newTopic, new Integer(qos));
mqttAsyncClient.subscribe(newTopic, qos);
} catch (MqttException e) {
e.printStackTrace();
}
}
/**
* Unsubscribe from device commands, on the behalf of a device, from the IBM Watson IoT Platform.
*
* @param deviceType
* object of String which denotes deviceType
* @param deviceId
* object of String which denotes deviceId
* @param command
* object of String which denotes the command name
*/
public void unsubscribeFromDeviceCommands(String deviceType, String deviceId, String command) {
try {
String newTopic = "iot-2/type/"+deviceType+"/id/"+deviceId+"/cmd/" + command + "/fmt/json";
subscriptions.remove(newTopic);
mqttAsyncClient.unsubscribe(newTopic);
} catch (MqttException e) {
e.printStackTrace();
}
}
public void subscribeToGatewayNotification() {
String newTopic = "iot-2/type/"+this.getGWDeviceType() +"/id/" +this.getGWDeviceId() + "/notify";
subscriptions.put(newTopic, 0);
try {
mqttAsyncClient.subscribe(newTopic, 0);
} catch (MqttException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* Subscribe to device commands, on the behalf of a device, to the IBM Watson IoT Platform.
* Quality of Service is set to 0
* @param deviceType
* object of String which denotes deviceType
* @param deviceId
* object of String which denotes deviceId
* @param command
* object of String which denotes command
* @param format
* object of String which denotes format, typical example of format could be json
*/
public void subscribeToDeviceCommands(String deviceType, String deviceId, String command, String format) {
try {
String newTopic = "iot-2/type/"+deviceType+"/id/"+deviceId+"/cmd/" + command + "/fmt/" + format;
subscriptions.put(newTopic, new Integer(0));
mqttAsyncClient.subscribe(newTopic, 0);
} catch (MqttException e) {
e.printStackTrace();
}
}
/**
* Subscribe to device commands, on the behalf of a device, to the IBM Watson IoT Platform.
*
* @param deviceType
* object of String which denotes deviceType
* @param deviceId
* object of String which denotes deviceId
* @param command
* object of String which denotes command
* @param format
* object of String which denotes format, typical example of format could be json
* @param qos
* Quality of Service, in int - can have values 0,1,2
*/
public void subscribeToDeviceCommands(String deviceType, String deviceId, String command, String format, int qos) {
try {
String newTopic = "iot-2/type/"+deviceType+"/id/"+deviceId+"/cmd/"+ command +"/fmt/" + format;
subscriptions.put(newTopic, new Integer(qos));
mqttAsyncClient.subscribe(newTopic, qos);
} catch (MqttException e) {
e.printStackTrace();
}
}
/**
* Unsubscribe from device commands, on the behalf of a device, from the IBM Watson IoT Platform.
*
* @param deviceType
* object of String which denotes deviceType
* @param deviceId
* object of String which denotes deviceId
* @param command
* object of String which denotes command name
* @param format
* object of String which denotes format, typical example of format could be json
*/
public void unsubscribeFromDeviceCommands(String deviceType, String deviceId, String command, String format) {
try {
String newTopic = "iot-2/type/"+deviceType+"/id/"+deviceId+"/cmd/"+ command +"/fmt/" + format;
subscriptions.remove(newTopic);
mqttAsyncClient.unsubscribe(newTopic);
} catch (MqttException e) {
e.printStackTrace();
}
}
/**
* This method is called by the MQTT library when the connection to the
* IBM Watson Platform is lost.
*
* This Watson IoT library will start the reconnect process, and application doesn't need to worry
*/
public void connectionLost(Throwable e) {
final String METHOD = "connectionLost";
LoggerUtility.info(CLASS_NAME, METHOD, "Connection lost: " + e.getMessage());
try {
connect();
Iterator> iterator = subscriptions.entrySet().iterator();
LoggerUtility.info(CLASS_NAME, METHOD, "Resubscribing....");
while (iterator.hasNext()) {
//Map.Entry pairs = (Map.Entry)iterator.next();
Entry pairs = iterator.next();
LoggerUtility.info(CLASS_NAME, METHOD, pairs.getKey() + " = " + pairs.getValue());
try {
mqttAsyncClient.subscribe(pairs.getKey().toString(), Integer.parseInt(pairs.getValue().toString()));
} catch (NumberFormatException | MqttException e1) {
e1.printStackTrace();
}
// iterator.remove(); // avoids a ConcurrentModificationException
}
} catch (MqttException e2) {
// TODO Auto-generated catch block
e2.printStackTrace();
}
}
/**
* This method is called by the MQTT library when a message is delivered successfully.
*
* A completed delivery does not guarantee that the message is received by the service
* because devices send messages with Quality of Service (QoS) 0. The message count
* represents the number of messages that were sent by the device without an error on
* from the perspective of the device.
*/
public void deliveryComplete(IMqttDeliveryToken token) {
final String METHOD = "deliveryComplete";
LoggerUtility.fine(CLASS_NAME, METHOD, "token = "+token.getMessageId());
messageCount++;
}
/**
* This method is called by the MQTT library when a message(command) is sent by the IBM Watson IoT Platform.
*
* The message(command) will be processed by this class and corresponding callback method will be called if
* registered.
*/
public void messageArrived(String topic, MqttMessage msg) throws Exception {
final String METHOD = "messageArrived";
if (gwCommandCallback != null) {
/* Only check whether the message is a application command if a callback
* has been defined for commands, otherwise it is a waste of time
* as without a callback there is nothing to process the generated
* event.
*/
Matcher matcher = GATEWAY_COMMAND_PATTERN.matcher(topic);
if (matcher.matches()) {
String type = matcher.group(1);
String id = matcher.group(2);
String command = matcher.group(3);
String format = matcher.group(4);
Command cmd = new Command(type, id, command, format, msg);
if(cmd.getTimestamp() != null ) {
LoggerUtility.fine(CLASS_NAME, METHOD, "Command received: " + cmd.toString());
gwCommandCallback.processCommand(cmd);
} else {
LoggerUtility.warn(CLASS_NAME, METHOD, "Command is not formatted properly, so not processing");
}
return;
}
matcher = GATEWAY_NOTIFICATION_PATTERN.matcher(topic);
if(matcher.matches()) {
String type = matcher.group(1);
String id = matcher.group(2);
Notification cmd = new Notification(type, id, msg);
}
}
}
/**
* Register the {@link com.ibm.iotf.client.gateway.GatewayCallback} class to the Gateway, so that the
* {@link com.ibm.iotf.client.gateway.GatewayCallback#processCommand(com.ibm.iotf.client.gateway.Command)} method gets called when
* command is received for the given subscription.
*
* Also, the
* {@link com.ibm.iotf.client.gateway.GatewayCallback#processNotification(com.ibm.iotf.client.gateway.Notification)} method gets called when
* any notification is received. Note that you one must have called subscribeToGatewayNotification inorder
* to get the notification.
*
* The messages are returned as an instance of the {@link com.ibm.iotf.client.gateway.Command}.
*
* @param callback an instance of {@link com.ibm.iotf.client.gateway.GatewayCallback}
*/
public void setGatewayCallback(GatewayCallback callback) {
this.gwCommandCallback = callback;
}
}