diff --git a/pom.xml b/pom.xml
index 19f0109..b00c44a 100644
--- a/pom.xml
+++ b/pom.xml
@@ -135,6 +135,12 @@
       <version>3.2.4</version>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>org.skyscreamer</groupId>
+      <artifactId>jsonassert</artifactId>
+      <version>1.5.0</version>
+      <scope>test</scope>
+    </dependency>
   </dependencies>
 
   <build>
diff --git a/src/main/java/no/entra/bacnet/agent/mqtt/AzureIoTMqttClient.java b/src/main/java/no/entra/bacnet/agent/mqtt/AzureIoTMqttClient.java
index 581b629..dfd3669 100644
--- a/src/main/java/no/entra/bacnet/agent/mqtt/AzureIoTMqttClient.java
+++ b/src/main/java/no/entra/bacnet/agent/mqtt/AzureIoTMqttClient.java
@@ -3,7 +3,10 @@
 import com.microsoft.azure.sdk.iot.device.DeviceClient;
 import com.microsoft.azure.sdk.iot.device.IotHubClientProtocol;
 import com.microsoft.azure.sdk.iot.device.Message;
+import no.entra.bacnet.agent.devices.DeviceId;
+import no.entra.bacnet.agent.mqtt.azureiot.Observation;
 import no.entra.bacnet.agent.mqtt.azureiot.SendReceive;
+import no.entra.bacnet.rec.ConfigurationRequest;
 import no.entra.bacnet.rec.RealEstateCore;
 import org.slf4j.Logger;
 
@@ -35,23 +38,46 @@ public AzureIoTMqttClient(String deviceConnectionString) throws URISyntaxExcepti
         connect();
     }
 
+    /**
+     * Used for testing
+     */
+    protected AzureIoTMqttClient() {
+        log.warn("Creating AzureIoTMqttClient for offline testing only.");
+    }
+
     @Override
-    public void publishRealEstateCore(RealEstateCore message, Optional<InetAddress> senderAddress) {
-        if (message != null) {
-            String msgStr = message.toJson();
-            Message msg = new Message(msgStr);
-            msg.setContentTypeFinal("application/json");
-            if (senderAddress.isPresent()) {
-                msg.setProperty(MESSAGE_FROM, senderAddress.get().toString());
-            }
-            msg.setProperty(MESSAGE_TYPE, REAL_ESTATE_CORE);
-            msg.setMessageId(java.util.UUID.randomUUID().toString());
-            msg.setExpiryTime(D2C_MESSAGE_TIMEOUT);
+    public void publishRealEstateCore(RealEstateCore recMessage, DeviceId recDeviceId, Optional<InetAddress> senderAddress) {
+        if (recMessage != null) {
+            Message msg = buildMqttMessage(recMessage, recDeviceId, senderAddress);
             sendMessage(msg);
         }
 
     }
 
+    public Message buildMqttMessage(RealEstateCore recMessage, DeviceId recDeviceId, Optional<InetAddress> senderAddress) {
+        String msgStr = "{ \n";
+        if (recDeviceId != null) {
+            msgStr += "\"deviceId\": \"" + recDeviceId.getId() + "\",\n";
+        }
+        if (recMessage != null) {
+            if (recMessage instanceof ConfigurationRequest) {
+                msgStr += "\"configurations\": [" + recMessage.toJson() + "]\n";
+            } else if (recMessage instanceof Observation) {
+                msgStr += "\"observations\": [" + recMessage.toJson() + "]\n";
+            }
+        }
+        msgStr += "}";
+        Message msg = new Message(msgStr);
+        msg.setContentTypeFinal("application/json");
+        if (senderAddress.isPresent()) {
+            msg.setProperty(MESSAGE_FROM, senderAddress.get().toString());
+        }
+        msg.setProperty(MESSAGE_TYPE, REAL_ESTATE_CORE);
+        msg.setMessageId(java.util.UUID.randomUUID().toString());
+        msg.setExpiryTime(D2C_MESSAGE_TIMEOUT);
+        return msg;
+    }
+
     @Override
     public void publishUnknownHexString(String hexString) {
         Message msg = new Message(hexString);
diff --git a/src/main/java/no/entra/bacnet/agent/mqtt/MqttClient.java b/src/main/java/no/entra/bacnet/agent/mqtt/MqttClient.java
index 5a21510..6aae329 100644
--- a/src/main/java/no/entra/bacnet/agent/mqtt/MqttClient.java
+++ b/src/main/java/no/entra/bacnet/agent/mqtt/MqttClient.java
@@ -1,5 +1,6 @@
 package no.entra.bacnet.agent.mqtt;
 
+import no.entra.bacnet.agent.devices.DeviceId;
 import no.entra.bacnet.rec.RealEstateCore;
 
 import java.net.InetAddress;
@@ -7,6 +8,6 @@
 
 public interface MqttClient {
 
-    void publishRealEstateCore(RealEstateCore message, Optional<InetAddress> sourceAddress);
+    void publishRealEstateCore(RealEstateCore message, DeviceId recDeviceId, Optional<InetAddress> sourceAddress);
     void publishUnknownHexString(String hexString);
 }
diff --git a/src/main/java/no/entra/bacnet/agent/observer/BlockingRecordAndForwardObserver.java b/src/main/java/no/entra/bacnet/agent/observer/BlockingRecordAndForwardObserver.java
index b35d0a7..dd69512 100644
--- a/src/main/java/no/entra/bacnet/agent/observer/BlockingRecordAndForwardObserver.java
+++ b/src/main/java/no/entra/bacnet/agent/observer/BlockingRecordAndForwardObserver.java
@@ -58,11 +58,11 @@ public void bacnetHexStringReceived(InetAddress sourceAddress, String hexString)
                     if (bacnetJson != null) {
                         RealEstateCore message = null;
                         try {
-                            DeviceId deviceId = findDeviceId(bacnetJson);
+                            DeviceId recDeviceId = findDeviceId(bacnetJson);
                             message = Bacnet2Rec.bacnetToRec(bacnetJson);
                             if (message != null) {
                                 message.setSenderAddress(sourceAddress.toString());
-                                mqttClient.publishRealEstateCore(message, Optional.of(sourceAddress));
+                                mqttClient.publishRealEstateCore(message, recDeviceId, Optional.of(sourceAddress));
                                 log.info("Message is published from bacnetJson: {}", bacnetJson);
                             } else {
                                 log.trace("Could not send empty message from bacnetJson: {}", bacnetJson);
diff --git a/src/test/java/no/entra/bacnet/agent/mqtt/AzureIoTMqttClientTest.java b/src/test/java/no/entra/bacnet/agent/mqtt/AzureIoTMqttClientTest.java
new file mode 100644
index 0000000..07c0a96
--- /dev/null
+++ b/src/test/java/no/entra/bacnet/agent/mqtt/AzureIoTMqttClientTest.java
@@ -0,0 +1,59 @@
+package no.entra.bacnet.agent.mqtt;
+
+import com.microsoft.azure.sdk.iot.device.Message;
+import no.entra.bacnet.agent.devices.DeviceId;
+import no.entra.bacnet.rec.ConfigurationRequest;
+import no.entra.bacnet.rec.helpers.DateTimeHelper;
+import org.junit.Before;
+import org.junit.Test;
+import org.skyscreamer.jsonassert.JSONAssert;
+
+import java.time.LocalDateTime;
+import java.util.Optional;
+
+import static org.junit.Assert.assertNotNull;
+
+public class AzureIoTMqttClientTest {
+
+    private LocalDateTime observationTime;
+    private AzureIoTMqttClient mqttClient;
+    private String expectedJson = "{\n" +
+            "  \"deviceId\": \"id1234\",\n" +
+            "  \"configurations\": [{\n" +
+            "    \"sender\": \"sendt from\",\n" +
+            "    \"recipient\": \"recip\",\n" +
+            "    \"observationTime\": \"2019-12-09T20:57:17.776468\",\n" +
+            "    \"id\": \"123\",\n" +
+            "    \"type\": \"IHave\",\n" +
+            "    \"properties\": {\n" +
+            "      \"ObjectName\": \"TFM434\"\n" +
+            "    }\n" +
+            "  }]\n" +
+            "}";
+
+    @Before
+    public void setUp() throws Exception {
+        String localDateTime = "2019-12-09T20:57:17.776468";
+        observationTime = DateTimeHelper.fromIsoString(localDateTime);
+        mqttClient = new AzureIoTMqttClient();
+    }
+
+    @Test
+    public void buildMqttMessage() {
+        ConfigurationRequest recMessage = new ConfigurationRequest();
+        recMessage.setObservationTime(observationTime);
+        recMessage.setId("123");
+        recMessage.setRecipient("recip");
+        recMessage.setSender("sendt from");
+        recMessage.setType("IHave");
+        recMessage.addProperty("ObjectName", "TFM434");
+        DeviceId recDeviceId = new DeviceId("id1234");
+        recDeviceId.setTfmTag("TFM767");
+        Message mqttMessage = mqttClient.buildMqttMessage(recMessage, recDeviceId, Optional.empty());
+        assertNotNull(mqttMessage);
+        byte[] bodyBytes = mqttMessage.getBytes();
+        String bodyJson = new String(bodyBytes);
+        assertNotNull(bodyJson);
+        JSONAssert.assertEquals(expectedJson, bodyJson, true);
+    }
+}
\ No newline at end of file