diff --git a/hawkbit-rest/hawkbit-ddi-api/src/main/java/org/eclipse/hawkbit/ddi/json/model/DdiActionFeedback.java b/hawkbit-rest/hawkbit-ddi-api/src/main/java/org/eclipse/hawkbit/ddi/json/model/DdiActionFeedback.java
index 8f711802b..aa02bc23c 100644
--- a/hawkbit-rest/hawkbit-ddi-api/src/main/java/org/eclipse/hawkbit/ddi/json/model/DdiActionFeedback.java
+++ b/hawkbit-rest/hawkbit-ddi-api/src/main/java/org/eclipse/hawkbit/ddi/json/model/DdiActionFeedback.java
@@ -53,7 +53,7 @@ public class DdiActionFeedback {
      *            status to be appended to the action
      */
     @JsonCreator
-    public DdiActionFeedback(@JsonProperty(value = "time", required = true) final String time,
+    public DdiActionFeedback(@JsonProperty(value = "time") final String time,
             @JsonProperty(value = "status", required = true) final DdiStatus status) {
         this.time = time;
         this.status = status;
diff --git a/hawkbit-rest/hawkbit-ddi-api/src/test/java/org/eclipse/hawkbit/ddi/json/model/DdiActionFeedbackTest.java b/hawkbit-rest/hawkbit-ddi-api/src/test/java/org/eclipse/hawkbit/ddi/json/model/DdiActionFeedbackTest.java
index c6b208ec0..0990059e4 100644
--- a/hawkbit-rest/hawkbit-ddi-api/src/test/java/org/eclipse/hawkbit/ddi/json/model/DdiActionFeedbackTest.java
+++ b/hawkbit-rest/hawkbit-ddi-api/src/test/java/org/eclipse/hawkbit/ddi/json/model/DdiActionFeedbackTest.java
@@ -14,7 +14,9 @@ import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
 
 import java.io.IOException;
 import java.time.Instant;
+import java.util.Collections;
 
+import com.fasterxml.jackson.core.JsonProcessingException;
 import org.assertj.core.util.Lists;
 import org.junit.jupiter.api.Test;
 
@@ -30,23 +32,39 @@ import io.qameta.allure.Story;
  */
 @Feature("Unit Tests - Direct Device Integration API")
 @Story("Serialization of DDI api Models")
-public class DdiActionFeedbackTest {
+class DdiActionFeedbackTest {
 
     private final ObjectMapper mapper = new ObjectMapper();
 
     @Test
-    @Description("Verify the correct serialization and deserialization of the model")
-    public void shouldSerializeAndDeserializeObject() throws IOException {
+    @Description("Verify the correct serialization and deserialization of the model with minimal payload")
+    void shouldSerializeAndDeserializeObjectWithoutOptionalValues() throws IOException {
         // Setup
-        final String time = Instant.now().toString();
         final DdiStatus ddiStatus = new DdiStatus(DdiStatus.ExecutionStatus.CLOSED, null, null, Lists.emptyList());
-        final DdiActionFeedback ddiActionFeedback = new DdiActionFeedback(time, ddiStatus);
+        final DdiActionFeedback ddiActionFeedback = new DdiActionFeedback(null, ddiStatus);
 
         // Test
         final String serializedDdiActionFeedback = mapper.writeValueAsString(ddiActionFeedback);
         final DdiActionFeedback deserializedDdiActionFeedback = mapper.readValue(serializedDdiActionFeedback,
                 DdiActionFeedback.class);
 
+        assertThat(deserializedDdiActionFeedback.getStatus()).hasToString(ddiStatus.toString());
+    }
+
+    @Test
+    @Description("Verify the correct serialization and deserialization of the model with all values provided")
+    void shouldSerializeAndDeserializeObjectWithOptionalValues() throws IOException {
+        // Setup
+        final String time = Instant.now().toString();
+        final DdiResult ddiResult = new DdiResult(DdiResult.FinalResult.SUCCESS, new DdiProgress(10,10));
+        final DdiStatus ddiStatus = new DdiStatus(DdiStatus.ExecutionStatus.CLOSED, ddiResult, 200, Collections.singletonList("myMessage"));
+        final DdiActionFeedback ddiActionFeedback = new DdiActionFeedback(time, ddiStatus);
+
+        // Test
+        final String serializedDdiActionFeedback = mapper.writeValueAsString(ddiActionFeedback);
+        final DdiActionFeedback deserializedDdiActionFeedback = mapper.readValue(serializedDdiActionFeedback,
+              DdiActionFeedback.class);
+
         assertThat(serializedDdiActionFeedback).contains(time);
         assertThat(deserializedDdiActionFeedback.getTime()).isEqualTo(time);
         assertThat(deserializedDdiActionFeedback.getStatus()).hasToString(ddiStatus.toString());
@@ -54,11 +72,38 @@ public class DdiActionFeedbackTest {
 
     @Test
     @Description("Verify that deserialization fails for known properties with a wrong datatype")
-    public void shouldFailForObjectWithWrongDataTypes() throws IOException {
+    void shouldFailForObjectWithWrongDataTypes() throws IOException {
         // Setup
         final String serializedDdiActionFeedback = "{\"time\":\"20190809T121314\",\"status\":{\"execution\": [closed],\"result\":null,\"details\":[]}}";
 
         assertThatExceptionOfType(MismatchedInputException.class).isThrownBy(
-                () -> mapper.readValue(serializedDdiActionFeedback, DdiActionFeedback.class));
+              () -> mapper.readValue(serializedDdiActionFeedback, DdiActionFeedback.class));
     }
+
+    @Test
+    @Description("Verify that deserialization works if optional fields are not parsed")
+    void shouldConvertItWithoutOptionalFieldTime() throws JsonProcessingException {
+        // Setup
+        final String serializedDdiActionFeedback = "{\n" + //
+                "  \"status\" : {\n" + //
+                "    \"result\" : {\n" + //
+                "      \"finished\" : \"none\"\n" + //
+                "    },\n" + //
+                "    \"execution\" : \"download\",\n" + //
+                "    \"details\" : [ \"Some message\" ]\n" + //
+                "  }\n" + //
+                "}";//
+
+        assertThat(mapper.readValue(serializedDdiActionFeedback, DdiActionFeedback.class)).satisfies(deserializedDdiActionFeedback ->  {
+            assertThat(deserializedDdiActionFeedback.getTime()).isNull();
+            assertThat(deserializedDdiActionFeedback.getStatus()).isNotNull();
+            assertThat(deserializedDdiActionFeedback.getStatus().getResult()).isNotNull();
+            assertThat(deserializedDdiActionFeedback.getStatus().getResult().getFinished()).isEqualTo(DdiResult.FinalResult.NONE);
+            assertThat(deserializedDdiActionFeedback.getStatus().getResult().getProgress()).isNull();
+            assertThat(deserializedDdiActionFeedback.getStatus().getCode()).isNull();
+            assertThat(deserializedDdiActionFeedback.getStatus().getExecution()).isEqualTo(DdiStatus.ExecutionStatus.DOWNLOAD);
+            assertThat(deserializedDdiActionFeedback.getStatus().getDetails()).hasSize(1);
+        });
+    }
+
 }