diff --git a/Main/Program.cs b/Main/Program.cs
index 1f17ead34e6af30b61da9c1441befe0666707ce2..e8dee9976b1b8f732fe85e6cc05fe57c8da627a5 100644
--- a/Main/Program.cs
+++ b/Main/Program.cs
@@ -52,21 +52,24 @@ namespace Main
                         Quantity = "Voltage",
                         Value = "120",
                         Unit = "V",
-                        DataType = "Single"
+                        DataType = "Single",
+                        Index = 0,
                     },
                     new SensorDataContract
                     {
                         Quantity = "Frequency",
                         Value = "1",
                         Unit = "Hz",
-                        DataType = "Single"
+                        DataType = "Single",
+                        Index = 0,
                     },
                     new SensorDataContract
                     {
                         Quantity = "OK parts",
                         Value = "600",
                         Unit = "pcs",
-                        DataType = "Int32"
+                        DataType = "Int32",
+                        Index = 0,
                     }
                 };
 
diff --git a/Main/TestData.cs b/Main/TestData.cs
index c59004af07beb8fd1938b3f18fe1b6013c5566a1..18b848e4bc3cfbf482c1337df71778e20668bfc6 100644
--- a/Main/TestData.cs
+++ b/Main/TestData.cs
@@ -99,14 +99,16 @@ namespace Main
                 Quantity = "Temperature",
                 Value = "16",
                 Unit = "°C",
-                DataType = "Single"
+                DataType = "Single",
+                Index = 0
             };
             SensorDataContract data2 = new SensorDataContract
             {
                 Quantity = "Humidity",
                 Value = "31",
                 Unit = "%",
-                DataType = "Single"
+                DataType = "Single",
+                Index = 1
             };
             SensorDataContract[] sensorDataContracts = new SensorDataContract[] { data1, data2 };
 
@@ -143,14 +145,16 @@ namespace Main
                 Quantity = "Temperature",
                 Value = "16",
                 Unit = "°C",
-                DataType = "Single"
+                DataType = "Single",
+                Index = 0
             };
             SensorDataContract data2 = new SensorDataContract
             {
                 Quantity = "Humidity",
                 Value = "31",
                 Unit = "%",
-                DataType = "Single"
+                DataType = "Single",
+                Index = 1
             };
             SensorDataContract data3 = new SensorDataContract
             {
@@ -158,7 +162,8 @@ namespace Main
                 Timestamp = 1614599484673,
                 Value = "800",
                 DataType = "Int32",
-                Unit = "unit"
+                Unit = "unit",
+                Index = 2
             };
             SensorDataContract[] sensorDataContracts = new SensorDataContract[] { data1, data2, data3 };
 
@@ -180,14 +185,16 @@ namespace Main
                 Quantity = "Temperature",
                 Value = "16",
                 Unit = "°C",
-                DataType = "Single"
+                DataType = "Single",
+                Index = 0
             };
             SensorDataContract data2 = new SensorDataContract
             {
                 Quantity = "Humidity",
                 Value = "31",
                 Unit = "%",
-                DataType = "Single"
+                DataType = "Single",
+                Index = 1
             };
             SensorDataContract data3 = new SensorDataContract
             {
@@ -195,7 +202,8 @@ namespace Main
                 Timestamp = 1614599484673,
                 Value = "800",
                 DataType = "Int32",
-                Unit = "unit"
+                Unit = "unit",
+                Index = 2
             };
             SensorDataContract[] sensorDataContracts = new SensorDataContract[] { data1, data2, data3 };