diff --git a/samples/memmon-protobuff/Device.cs b/samples/memmon-protobuff/Device.cs
index 854c920..fb0588e 100644
--- a/samples/memmon-protobuff/Device.cs
+++ b/samples/memmon-protobuff/Device.cs
@@ -43,7 +43,7 @@ public Device(ILogger<Device> logger, IConfiguration configuration, TelemetryCli
 
     protected override async Task ExecuteAsync(CancellationToken stoppingToken)
     {
-        var cs = new ConnectionSettings(_configuration.GetConnectionString("cs")) { ModelId="memmon.proto"};
+        var cs = new ConnectionSettings(_configuration.GetConnectionString("cs")) { ModelId = MemmonClient.ModelId };
         _logger.LogWarning($"Connecting to..{cs}");
         var mqtt = await BrokerClientFactory.CreateFromConnectionSettingsAsync(cs, true, stoppingToken);
         connectionSettings = cs;
diff --git a/samples/memmon-protobuff/_protos/memmon.cs b/samples/memmon-protobuff/_protos/memmon.cs
index 66823af..0e280ab 100644
--- a/samples/memmon-protobuff/_protos/memmon.cs
+++ b/samples/memmon-protobuff/_protos/memmon.cs
@@ -12,6 +12,7 @@ namespace _protos
 {
     internal class MemmonClient
     {
+        internal const string ModelId = "rido.memmon";
         public Properties Props = new Properties();
         public IReadOnlyProperty<Properties> AllProperties { get; set; }
         public IWritableProperty<Properties, ack> Property_interval { get; set; }
diff --git a/samples/memmon-protobuff/_protos/memmon.proto b/samples/memmon-protobuff/_protos/memmon.proto
index d7b366c..20e9ac3 100644
--- a/samples/memmon-protobuff/_protos/memmon.proto
+++ b/samples/memmon-protobuff/_protos/memmon.proto
@@ -4,6 +4,8 @@ option csharp_namespace = "memmon_model_protos";
 import "google/protobuf/timestamp.proto";
 import "google/protobuf/any.proto";
 
+package rido.memmon;
+
 message Telemetries {
 	double workingSet = 1;
 }
diff --git a/samples/mqtt-grpc-device/Device.cs b/samples/mqtt-grpc-device/Device.cs
index 6a65faa..dabe226 100644
--- a/samples/mqtt-grpc-device/Device.cs
+++ b/samples/mqtt-grpc-device/Device.cs
@@ -96,16 +96,19 @@ async Task<ack> OnPropIntervalReceivedHandler(Properties desired)
         {
             ArgumentNullException.ThrowIfNull(connection);
             ack ack = new ack();
+            client!.Interval.Version++;
             if (desired.Interval > 0)
             {
                 client!.Props.Interval= desired.Interval;
                 ack.Status = 200;
+                ack.Version = client.Interval.Version!.Value;
                 ack.Description = "property accepted";
                 ack.Value = Google.Protobuf.WellKnownTypes.Any.Pack(desired);
             }
             else
             {
                 ack.Status = 200;
+                ack.Version = client.Interval.Version!.Value;
                 ack.Description = "negative values not accepted";
                 ack.Value = Google.Protobuf.WellKnownTypes.Any.Pack(client!.Props);
             }
diff --git a/samples/mqtt-grpc-device/protos/mqtt-grpc-device.proto b/samples/mqtt-grpc-device/protos/mqtt-grpc-device.proto
index 2abdb2d..facd97a 100644
--- a/samples/mqtt-grpc-device/protos/mqtt-grpc-device.proto
+++ b/samples/mqtt-grpc-device/protos/mqtt-grpc-device.proto
@@ -4,6 +4,8 @@ option csharp_namespace = "mqtt_grpc_device_protos";
 import "google/protobuf/timestamp.proto";
 import "google/protobuf/any.proto";
 
+package rido.mqtt_grpc_device;
+
 // @topic: -> device/{clientId}/tel[/{telName}]
 message Telemetries {
 	double temperature = 1; 
@@ -30,9 +32,10 @@ service Commands {
 }
 
 message ack {
-	int32 status = 1;
-	string description = 2;
-	google.protobuf.Any value =3;
+	google.protobuf.Any value = 1;
+	int32 version = 2;
+	int32 status = 3;
+	string description = 4;
 }
 
 message echoRequest {
diff --git a/samples/mqtt-grpc-device/mqtt_grpc_sample_device.cs b/samples/mqtt-grpc-device/protos/mqtt_grpc_sample_device.cs
similarity index 95%
rename from samples/mqtt-grpc-device/mqtt_grpc_sample_device.cs
rename to samples/mqtt-grpc-device/protos/mqtt_grpc_sample_device.cs
index 50a07ad..9c53b8b 100644
--- a/samples/mqtt-grpc-device/mqtt_grpc_sample_device.cs
+++ b/samples/mqtt-grpc-device/protos/mqtt_grpc_sample_device.cs
@@ -13,7 +13,7 @@ namespace mqtt_grpc_device;
 
 internal class mqtt_grpc_sample_device 
 {
-    internal const string ModelId = "mqtt-grpc-device.proto";
+    internal const string ModelId = "rido.mqtt_grpc_device";
     internal IMqttClient Connection;
 
     internal Properties Props;