Server-side Two-way MQTT RPC Test

+/**
+ * Copyright © 2016 The Thingsboard Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.thingsboard.server.mqtt.rpc;
+
+import lombok.extern.slf4j.Slf4j;
+import org.eclipse.paho.client.mqttv3.*;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+import org.thingsboard.client.tools.RestClient;
+import org.thingsboard.server.common.data.Device;
+import org.thingsboard.server.common.data.security.DeviceCredentials;
+import org.thingsboard.server.mqtt.AbstractFeatureIntegrationTest;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+
+/**
+ * @author Valerii Sosliuk
+ */
+@Slf4j
+public class MqttServerSideRpcIntegrationTest extends AbstractFeatureIntegrationTest {
+
+    private static final String MQTT_URL = "tcp://localhost:1883";
+    private static final String BASE_URL = "http://localhost:8080";
+
+    private static final String USERNAME = "tenant@thingsboard.org";
+    private static final String PASSWORD = "tenant";
+
+    private Device savedDevice;
+
+    private String accessToken;
+    private RestClient restClient;
+
+    @Before
+    public void beforeTest() throws Exception {
+        restClient = new RestClient(BASE_URL);
+        restClient.login(USERNAME, PASSWORD);
+
+        Device device = new Device();
+        device.setName("Test Server-Side RPC Device");
+        savedDevice = restClient.getRestTemplate().postForEntity(BASE_URL + "/api/device", device, Device.class).getBody();
+        DeviceCredentials deviceCredentials =
+                restClient.getRestTemplate().getForEntity(BASE_URL + "/api/device/" + savedDevice.getId().getId().toString() + "/credentials", DeviceCredentials.class).getBody();
+        assertEquals(savedDevice.getId(), deviceCredentials.getDeviceId());
+        accessToken = deviceCredentials.getCredentialsId();
+        assertNotNull(accessToken);
+    }
+
+    @Test
+    public void testServerMqttTwoWayRpc() throws Exception {
+        String clientId = MqttAsyncClient.generateClientId();
+        MqttAsyncClient client = new MqttAsyncClient(MQTT_URL, clientId);
+
+        MqttConnectOptions options = new MqttConnectOptions();
+        options.setUserName(accessToken);
+        client.connect(options);
+        Thread.sleep(3000);
+        client.subscribe("v1/devices/me/rpc/request/+",1);
+        client.setCallback(new TestMqttCallback(client));
+
+        String setGpioRequest = "{\"method\":\"setGpio\",\"params\":{\"pin\": \"23\",\"value\": 1}}";
+        String deviceId = savedDevice.getId().getId().toString();
+        String result = restClient.getRestTemplate().postForEntity(BASE_URL + "api/plugins/rpc/twoway/" + deviceId, setGpioRequest, String.class).getBody();
+        log.info("Result: " + result);
+        Assert.assertEquals("{\"value1\":\"A\",\"value2\":\"B\"}", result);
+    }
+
+    private static class TestMqttCallback implements MqttCallback {
+
+        private final MqttAsyncClient client;
+
+        TestMqttCallback(MqttAsyncClient client) {
+            this.client = client;
+        }
+
+        @Override
+        public void connectionLost(Throwable throwable) {
+        }
+
+        @Override
+        public void messageArrived(String requestTopic, MqttMessage mqttMessage) throws Exception {
+            log.info("Message Arrived: " + mqttMessage.getPayload().toString());
+            MqttMessage message = new MqttMessage();
+            String responseTopic = requestTopic.replace("request", "response");
+            message.setPayload("{\"value1\":\"A\", \"value2\":\"B\"}".getBytes());
+            client.publish(responseTopic, message);
+        }
+
+        @Override
+        public void deliveryComplete(IMqttDeliveryToken iMqttDeliveryToken) {
+
+        }
+    }
+}