diff --git a/src/main/kotlin/mobildata/client/MobilDataClient.kt b/src/main/kotlin/mobildata/client/MobilDataClient.kt
new file mode 100644
index 0000000000000000000000000000000000000000..05abb6872da5abf2abb61be6ccf82c532b699d02
--- /dev/null
+++ b/src/main/kotlin/mobildata/client/MobilDataClient.kt
@@ -0,0 +1,19 @@
+package mobildata.client
+
+import feign.Headers
+import feign.Param
+import feign.RequestLine
+import mobildata.model.User
+import mobildata.model.inout.Login
+import mobildata.model.inout.MobilDataIn
+import mobildata.model.inout.Register
+import org.springframework.web.bind.annotation.RequestBody
+import org.springframework.web.bind.annotation.RequestHeader
+import org.springframework.web.bind.annotation.RequestMapping
+
+@Headers("Content-Type: application/json")
+interface MobilDataClient {
+    @RequestLine("POST /api/data")
+    fun dataInput(@Param("Authorization") token:String, @RequestBody mobilIn: MobilDataIn)
+
+}
diff --git a/src/main/kotlin/mobildata/model/User.kt b/src/main/kotlin/mobildata/model/User.kt
index f1368f801209902f386ddd16331be89204aee9e9..695a435603e1df6258aa302c1eb78f60fac970d9 100644
--- a/src/main/kotlin/mobildata/model/User.kt
+++ b/src/main/kotlin/mobildata/model/User.kt
@@ -18,7 +18,7 @@ data class User(var email: String = "",
                 var password: String = "",
                 var token: String = "",
                 @JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "dd/mm/yyyy")
-                var birthDate: Date = Date(),
+                var birthDate: Date? = null,
                 var deviceType: String = "", // TODO type
                 var androidVersion: Int? = null,
                 @Id @GeneratedValue(strategy = GenerationType.AUTO)
diff --git a/src/test/kotlin/mobildata/ApiApplicationTests.kt b/src/test/kotlin/mobildata/ApiApplicationTests.kt
index dd8f406198694e90441d6231f7507af7470d8cf6..3fc8c9a671964d169858e0cb31e9e3755f8d8d76 100644
--- a/src/test/kotlin/mobildata/ApiApplicationTests.kt
+++ b/src/test/kotlin/mobildata/ApiApplicationTests.kt
@@ -3,8 +3,11 @@ package mobildata
 import feign.Feign
 import feign.gson.GsonDecoder
 import feign.gson.GsonEncoder
+import mobildata.client.MobilDataClient
 import mobildata.client.UserClient
+import mobildata.model.LocationData
 import mobildata.model.inout.Login
+import mobildata.model.inout.MobilDataIn
 import mobildata.model.inout.Register
 import org.hamcrest.Matchers
 import org.junit.Assert
@@ -25,6 +28,7 @@ class ApiApplicationTests {
     @Autowired
     var environment: Environment? = null
     var userClient: UserClient? = null
+    var dataClient: MobilDataClient? = null
 
     fun <T> buildClient(t: Class<T>): T {
         environment.let {
@@ -38,6 +42,7 @@ class ApiApplicationTests {
     @Before
     fun before() {
         userClient = buildClient(UserClient::class.java)
+        dataClient = buildClient(MobilDataClient::class.java)
     }
 
     @Test
@@ -61,6 +66,18 @@ class ApiApplicationTests {
         Assert.assertEquals("bar@bar.com", barLogin?.email)
         Assert.assertThat(barLogin?.token, Matchers.notNullValue())
         println("Login bar OK")
+
+        // cannot do that
+        // feign does not support dynamic header parameter, if there is already a body parameter (bug)
+
+        //dataClient?.dataInput(barLogin!!.token ,MobilDataIn(location = LocationData(34.5, 45.6), sleepTime = 21, isNfcOn = true,
+        //        isWifiOn = false, brightness = 23, battery = 98, isMobilDataOn = false, isBluetoothOn = false))
+
+    }
+
+    @Test
+    fun sendData() {
+        Url url = Url( "https://api.github.com/users/"
     }
 
 }