diff --git a/docs/doxygen/include/size_table.md b/docs/doxygen/include/size_table.md
index 5f654632..23f7fbdc 100644
--- a/docs/doxygen/include/size_table.md
+++ b/docs/doxygen/include/size_table.md
@@ -9,8 +9,8 @@
     </tr>
     <tr>
         <td>core_mqtt.c</td>
-        <td><center>4.9K</center></td>
-        <td><center>4.2K</center></td>
+        <td><center>5.0K</center></td>
+        <td><center>4.3K</center></td>
     </tr>
     <tr>
         <td>core_mqtt_state.c</td>
@@ -24,7 +24,7 @@
     </tr>
     <tr>
         <td><b>Total estimates</b></td>
-        <td><b><center>9.5K</center></b></td>
-        <td><b><center>7.8K</center></b></td>
+        <td><b><center>9.6K</center></b></td>
+        <td><b><center>7.9K</center></b></td>
     </tr>
 </table>
diff --git a/test/unit-test/core_mqtt_utest.c b/test/unit-test/core_mqtt_utest.c
index 0f7f1442..97d1a024 100644
--- a/test/unit-test/core_mqtt_utest.c
+++ b/test/unit-test/core_mqtt_utest.c
@@ -7242,3 +7242,47 @@ void test_MQTT_InitStatefulQoS_callback_is_null( void )
     TEST_ASSERT_EQUAL( MQTTBadParameter, mqttStatus );
 }
 /* ========================================================================== */
+
+void test_MQTT_GetBytesInMQTTVec( void )
+{
+    TransportOutVector_t pTransportArray[10] = {
+        {.iov_base = NULL, .iov_len = 1 },
+        {.iov_base = NULL, .iov_len = 2 },
+        {.iov_base = NULL, .iov_len = 3 },
+        {.iov_base = NULL, .iov_len = 4 },
+        {.iov_base = NULL, .iov_len = 5 },
+        {.iov_base = NULL, .iov_len = 6 },
+        {.iov_base = NULL, .iov_len = 7 },
+        {.iov_base = NULL, .iov_len = 8 },
+        {.iov_base = NULL, .iov_len = 9 },
+        {.iov_base = NULL, .iov_len = 10 },
+    };
+
+    size_t ret = MQTT_GetBytesInMQTTVec( (MQTTVec_t*)pTransportArray, 10);
+
+    TEST_ASSERT_EQUAL(55, ret);
+}
+/* ========================================================================== */
+
+void test_MQTT_SerializeMQTTVec( void )
+{
+    TransportOutVector_t pTransportArray[10] = {
+        {.iov_base = "T", .iov_len = 1 },
+        {.iov_base = "hi", .iov_len = 2 },
+        {.iov_base = "s i", .iov_len = 3 },
+        {.iov_base = "s a ", .iov_len = 4 },
+        {.iov_base = "coreM", .iov_len = 5 },
+        {.iov_base = "QTT un", .iov_len = 6 },
+        {.iov_base = "it test", .iov_len = 7 },
+        {.iov_base = " string.", .iov_len = 8 },
+        {.iov_base = "USER SHOU", .iov_len = 9 },
+        {.iov_base = "LDNT USE IT", .iov_len = 10 },
+    };
+
+    uint8_t array[60] = {0};
+    MQTT_SerializeMQTTVec(array, (MQTTVec_t*)pTransportArray, 10 );
+
+    TEST_ASSERT_EQUAL_MEMORY("This is a coreMQTT unit test string.USER SHOULDNT USE IT", array, 55);
+    TEST_ASSERT_EQUAL_MEMORY("\0\0\0\0\0", &array[55], 5);
+
+}
\ No newline at end of file