added default mqtt proto schemas

@@ -133,8 +133,32 @@ export class MqttDeviceProfileTransportConfigurationComponent implements Control
   private updateTransportPayloadBasedControls(type: MqttTransportPayloadType) {
     const transportPayloadTypeConfigurationFormGroup = this.mqttDeviceProfileTransportConfigurationFormGroup.get('configuration.transportPayloadTypeConfiguration') as FormGroup;
     if (type === MqttTransportPayloadType.PROTOBUF) {
-      transportPayloadTypeConfigurationFormGroup.registerControl('deviceTelemetryProtoSchema', this.fb.control(null, Validators.required));
-      transportPayloadTypeConfigurationFormGroup.registerControl('deviceAttributesProtoSchema', this.fb.control(null, Validators.required));
+      const defaultTelemetrySchema = "syntax =\"proto3\";\n" +
+        "package telemetry;\n" +
+        "\n" +
+        "message SensorDataReading {\n" +
+        "\n" +
+        "  double temperature = 1;\n" +
+        "  double humidity = 2;\n" +
+        "  InnerObject innerObject = 3;\n" +
+        "\n" +
+        "  message InnerObject {\n" +
+        "    string key1 = 1;\n" +
+        "    bool key2 = 2;\n" +
+        "    double key3 = 3;\n" +
+        "    int32 key4 = 4;\n" +
+        "    string key5 = 5;\n" +
+        "  }\n" +
+        "}\n";
+      const defaultAttributesSchema = "syntax =\"proto3\";\n" +
+        "package attributes;\n" +
+        "\n" +
+        "message SensorDataReading {\n" +
+        "  string firmwareVersion = 1;\n" +
+        "  string serialNumber = 2;\n" +
+        "}";
+      transportPayloadTypeConfigurationFormGroup.registerControl('deviceTelemetryProtoSchema', this.fb.control(defaultTelemetrySchema, Validators.required));
+      transportPayloadTypeConfigurationFormGroup.registerControl('deviceAttributesProtoSchema', this.fb.control(defaultAttributesSchema, Validators.required));
     } else {
       transportPayloadTypeConfigurationFormGroup.removeControl('deviceTelemetryProtoSchema');
       transportPayloadTypeConfigurationFormGroup.removeControl('deviceAttributesProtoSchema');