diff --git a/car_srv/clients/rc/src/main/java/Direction.kt b/car_srv/clients/rc/src/main/java/Direction.kt
deleted file mode 100644
index 87d49b876c5..00000000000
--- a/car_srv/clients/rc/src/main/java/Direction.kt
+++ /dev/null
@@ -1,182 +0,0 @@
-class DirectionRequest private constructor (command: Command = DirectionRequest.Command.fromIntToCommand(0)) {
-  var command : Command
-    private set
-
-
-  init {
-    this.command = command
-  }
-  enum class Command(val ord: Int) {
-    stop (0),
-    forward (1),
-    backward (2),
-    left (3),
-    right (4);
-
-    companion object {
-      fun fromIntToCommand (ord: Int): Command {
-        return when (ord) {
-          0 -> Command.stop
-          1 -> Command.forward
-          2 -> Command.backward
-          3 -> Command.left
-          4 -> Command.right
-          else -> throw InvalidProtocolBufferException("Error: got unexpected int ${ord} while parsing Command ");
-        }
-      }
-    }
-  }
-
-  fun writeTo (output: CodedOutputStream): Unit {
-    output.writeEnum (1, command.ord)
-  }
-
-  class BuilderDirectionRequest constructor (command: Command = DirectionRequest.Command.fromIntToCommand(0)) {
-    var command : Command
-      private set
-    fun setCommand(value: Command): DirectionRequest.BuilderDirectionRequest {
-      command = value
-      return this
-    }
-
-
-    init {
-      this.command = command
-    }
-
-    fun readFrom (input: CodedInputStream): DirectionRequest.BuilderDirectionRequest {
-      command = Command.fromIntToCommand(input.readEnum(1))
-      return this
-}
-
-    fun build(): DirectionRequest {
-      return DirectionRequest(command)
-    }
-
-    fun parseFieldFrom(input: CodedInputStream): Boolean {
-      if (input.isAtEnd()) { return false }
-      val tag = input.readInt32NoTag()
-      if (tag == 0) { return false } 
-      val fieldNumber = WireFormat.getTagFieldNumber(tag)
-      val wireType = WireFormat.getTagWireType(tag)
-      when(fieldNumber) {
-        1 -> command = Command.fromIntToCommand(input.readEnumNoTag())
-      }
-      return true}
-    fun parseFrom(input: CodedInputStream): DirectionRequest.BuilderDirectionRequest {
-      while(parseFieldFrom(input)) {}
-      return this
-    }
-    fun getSize(): Int {
-      var size = 0
-      size += WireFormat.getEnumSize(1, command.ord)
-      return size
-    }
-  }
-
-
-  fun mergeWith (other: DirectionRequest) {
-    command = other.command
-  }
-
-  fun mergeFrom (input: CodedInputStream) {
-    val builder = DirectionRequest.BuilderDirectionRequest()
-    mergeWith(builder.parseFrom(input).build())}
-  fun getSize(): Int {
-    var size = 0
-    size += WireFormat.getEnumSize(1, command.ord)
-    return size
-  }
-}
-
-
-class DirectionResponse private constructor (code: Int = 0, errorMsg: kotlin.String = "") {
-  var code : Int
-    private set
-
-  var errorMsg : kotlin.String
-    private set
-
-
-  init {
-    this.code = code
-    this.errorMsg = errorMsg
-  }
-
-  fun writeTo (output: CodedOutputStream): Unit {
-    output.writeInt32 (1, code)
-    output.writeString (2, errorMsg)
-  }
-
-  class BuilderDirectionResponse constructor (code: Int = 0, errorMsg: kotlin.String = "") {
-    var code : Int
-      private set
-    fun setCode(value: Int): DirectionResponse.BuilderDirectionResponse {
-      code = value
-      return this
-    }
-
-    var errorMsg : kotlin.String
-      private set
-    fun setErrorMsg(value: kotlin.String): DirectionResponse.BuilderDirectionResponse {
-      errorMsg = value
-      return this
-    }
-
-
-    init {
-      this.code = code
-      this.errorMsg = errorMsg
-    }
-
-    fun readFrom (input: CodedInputStream): DirectionResponse.BuilderDirectionResponse {
-      code = input.readInt32(1)
-      errorMsg = input.readString(2)
-      return this
-}
-
-    fun build(): DirectionResponse {
-      return DirectionResponse(code, errorMsg)
-    }
-
-    fun parseFieldFrom(input: CodedInputStream): Boolean {
-      if (input.isAtEnd()) { return false }
-      val tag = input.readInt32NoTag()
-      if (tag == 0) { return false } 
-      val fieldNumber = WireFormat.getTagFieldNumber(tag)
-      val wireType = WireFormat.getTagWireType(tag)
-      when(fieldNumber) {
-        1 -> code = input.readInt32NoTag()
-        2 -> errorMsg = input.readStringNoTag()
-      }
-      return true}
-    fun parseFrom(input: CodedInputStream): DirectionResponse.BuilderDirectionResponse {
-      while(parseFieldFrom(input)) {}
-      return this
-    }
-    fun getSize(): Int {
-      var size = 0
-      size += WireFormat.getInt32Size(1, code)
-      size += WireFormat.getStringSize(2, errorMsg)
-      return size
-    }
-  }
-
-
-  fun mergeWith (other: DirectionResponse) {
-    code = other.code
-    errorMsg = other.errorMsg
-  }
-
-  fun mergeFrom (input: CodedInputStream) {
-    val builder = DirectionResponse.BuilderDirectionResponse()
-    mergeWith(builder.parseFrom(input).build())}
-  fun getSize(): Int {
-    var size = 0
-    size += WireFormat.getInt32Size(1, code)
-    size += WireFormat.getStringSize(2, errorMsg)
-    return size
-  }
-}
-
-
diff --git a/car_srv/clients/rc/src/main/java/WireFormat.kt b/car_srv/clients/rc/src/main/java/WireFormat.kt
index 1caabc33a9c..f81259f7496 100644
--- a/car_srv/clients/rc/src/main/java/WireFormat.kt
+++ b/car_srv/clients/rc/src/main/java/WireFormat.kt
@@ -104,11 +104,15 @@ object WireFormat {
     }
 
     fun getStringSize(fieldNumber: Int, value: String): Int {
+        if (value.length == 0)
+            return 0
         val encodedStringSize = value.toByteArray(Charsets.UTF_8).size  //TODO: not sure if it's the best way to do it
         return encodedStringSize + getTagSize(fieldNumber, WireType.LENGTH_DELIMITED) + getVarint32Size(encodedStringSize)
     }
 
     fun getBytesSize(fieldNumber: Int, value: ByteArray): Int {
+        if (value.size == 0)
+            return 0
         return value.size + getTagSize(fieldNumber, WireType.LENGTH_DELIMITED) + getVarint32Size(value.size)
     }
 }
\ No newline at end of file
diff --git a/car_srv/clients/rc/src/main/java/direction.kt b/car_srv/clients/rc/src/main/java/direction.kt
new file mode 100644
index 00000000000..c2f33a305d9
--- /dev/null
+++ b/car_srv/clients/rc/src/main/java/direction.kt
@@ -0,0 +1,276 @@
+class DirectionRequest private constructor (command: DirectionRequest.Command = DirectionRequest.Command.fromIntToCommand(0)) {
+  var command : DirectionRequest.Command
+    private set
+
+
+  init {
+    this.command = command
+  }
+  enum class Command(val ord: Int) {
+    stop (0),
+    forward (1),
+    backward (2),
+    left (3),
+    right (4);
+
+    companion object {
+      fun fromIntToCommand (ord: Int): Command {
+        return when (ord) {
+          0 -> Command.stop
+          1 -> Command.forward
+          2 -> Command.backward
+          3 -> Command.left
+          4 -> Command.right
+          else -> throw InvalidProtocolBufferException("Error: got unexpected int ${ord} while parsing Command ");
+        }
+      }
+    }
+  }
+
+  fun writeTo (output: CodedOutputStream) {
+    if (command != DirectionRequest.Command.fromIntToCommand(0)) {
+      output.writeEnum (1, command.ord)
+    }
+  }
+
+  class BuilderDirectionRequest constructor (command: DirectionRequest.Command = DirectionRequest.Command.fromIntToCommand(0)) {
+    var command : DirectionRequest.Command
+      private set
+    fun setCommand(value: DirectionRequest.Command): DirectionRequest.BuilderDirectionRequest {
+      command = value
+      return this
+    }
+
+
+    init {
+      this.command = command
+    }
+
+    fun writeTo (output: CodedOutputStream) {
+      if (command != DirectionRequest.Command.fromIntToCommand(0)) {
+        output.writeEnum (1, command.ord)
+      }
+    }
+
+    fun build(): DirectionRequest {
+      return DirectionRequest(command)
+    }
+
+    fun parseFieldFrom(input: CodedInputStream): Boolean {
+      if (input.isAtEnd()) { return false }
+      val tag = input.readInt32NoTag()
+      if (tag == 0) { return false } 
+      val fieldNumber = WireFormat.getTagFieldNumber(tag)
+      val wireType = WireFormat.getTagWireType(tag)
+      when(fieldNumber) {
+        1 -> {
+          if (wireType != WireType.VARINT) {
+            throw InvalidProtocolBufferException("Error: Field number 1 has wire type WireType.VARINT but read ${wireType.toString()}")}
+          command = DirectionRequest.Command.fromIntToCommand(input.readEnumNoTag())
+        }
+      }
+      return true}
+    fun parseFromWithSize(input: CodedInputStream, expectedSize: Int): DirectionRequest.BuilderDirectionRequest {
+      while(getSizeNoTag() < expectedSize) {
+        parseFieldFrom(input)
+      }
+      if (getSizeNoTag() > expectedSize) { throw InvalidProtocolBufferException("Error: expected size of message $expectedSize, but have read at least ${getSizeNoTag()}") }
+      return this
+    }
+    fun parseFrom(input: CodedInputStream): DirectionRequest.BuilderDirectionRequest {
+      while(parseFieldFrom(input)) {}
+      return this
+    }
+    fun getSize(fieldNumber: Int): Int {
+      var size = 0
+      if (command != DirectionRequest.Command.fromIntToCommand(0)) {
+        size += WireFormat.getEnumSize(1, command.ord)
+      }
+      size += WireFormat.getVarint32Size(size) + WireFormat.getTagSize(fieldNumber, WireType.LENGTH_DELIMITED)
+      return size
+    }
+    fun getSizeNoTag(): Int {
+      var size = 0
+      if (command != DirectionRequest.Command.fromIntToCommand(0)) {
+        size += WireFormat.getEnumSize(1, command.ord)
+      }
+      return size
+    }
+  }
+
+
+  fun mergeWith (other: DirectionRequest) {
+    command = other.command
+  }
+
+  fun mergeFromWithSize (input: CodedInputStream, expectedSize: Int) {
+    val builder = DirectionRequest.BuilderDirectionRequest()
+    mergeWith(builder.parseFromWithSize(input, expectedSize).build())}
+
+  fun mergeFrom (input: CodedInputStream) {
+    val builder = DirectionRequest.BuilderDirectionRequest()
+    mergeWith(builder.parseFrom(input).build())}
+  fun getSize(fieldNumber: Int): Int {
+    var size = 0
+    if (command != DirectionRequest.Command.fromIntToCommand(0)) {
+      size += WireFormat.getEnumSize(1, command.ord)
+    }
+    size += WireFormat.getVarint32Size(size) + WireFormat.getTagSize(fieldNumber, WireType.LENGTH_DELIMITED)
+    return size
+  }
+  fun getSizeNoTag(): Int {
+    var size = 0
+    if (command != DirectionRequest.Command.fromIntToCommand(0)) {
+      size += WireFormat.getEnumSize(1, command.ord)
+    }
+    return size
+  }
+}
+
+
+class DirectionResponse private constructor (code: Int = 0, errorMsg: String = "") {
+  var code : Int
+    private set
+
+  var errorMsg : String
+    private set
+
+
+  init {
+    this.code = code
+    this.errorMsg = errorMsg
+  }
+
+  fun writeTo (output: CodedOutputStream) {
+    if (code != 0) {
+      output.writeInt32 (1, code)
+    }
+    if (errorMsg != "") {
+      output.writeString (2, errorMsg)
+    }
+  }
+
+  class BuilderDirectionResponse constructor (code: Int = 0, errorMsg: String = "") {
+    var code : Int
+      private set
+    fun setCode(value: Int): DirectionResponse.BuilderDirectionResponse {
+      code = value
+      return this
+    }
+
+    var errorMsg : String
+      private set
+    fun setErrorMsg(value: String): DirectionResponse.BuilderDirectionResponse {
+      errorMsg = value
+      return this
+    }
+
+
+    init {
+      this.code = code
+      this.errorMsg = errorMsg
+    }
+
+    fun writeTo (output: CodedOutputStream) {
+      if (code != 0) {
+        output.writeInt32 (1, code)
+      }
+      if (errorMsg != "") {
+        output.writeString (2, errorMsg)
+      }
+    }
+
+    fun build(): DirectionResponse {
+      return DirectionResponse(code, errorMsg)
+    }
+
+    fun parseFieldFrom(input: CodedInputStream): Boolean {
+      if (input.isAtEnd()) { return false }
+      val tag = input.readInt32NoTag()
+      if (tag == 0) { return false } 
+      val fieldNumber = WireFormat.getTagFieldNumber(tag)
+      val wireType = WireFormat.getTagWireType(tag)
+      when(fieldNumber) {
+        1 -> {
+          if (wireType != WireType.VARINT) {
+            throw InvalidProtocolBufferException("Error: Field number 1 has wire type WireType.VARINT but read ${wireType.toString()}")}
+          code = input.readInt32NoTag()
+        }
+        2 -> {
+          if (wireType != WireType.LENGTH_DELIMITED) {
+            throw InvalidProtocolBufferException("Error: Field number 2 has wire type WireType.LENGTH_DELIMITED but read ${wireType.toString()}")}
+          errorMsg = input.readStringNoTag()
+        }
+      }
+      return true}
+    fun parseFromWithSize(input: CodedInputStream, expectedSize: Int): DirectionResponse.BuilderDirectionResponse {
+      while(getSizeNoTag() < expectedSize) {
+        parseFieldFrom(input)
+      }
+      if (getSizeNoTag() > expectedSize) { throw InvalidProtocolBufferException("Error: expected size of message $expectedSize, but have read at least ${getSizeNoTag()}") }
+      return this
+    }
+    fun parseFrom(input: CodedInputStream): DirectionResponse.BuilderDirectionResponse {
+      while(parseFieldFrom(input)) {}
+      return this
+    }
+    fun getSize(fieldNumber: Int): Int {
+      var size = 0
+      if (code != 0) {
+        size += WireFormat.getInt32Size(1, code)
+      }
+      if (errorMsg != "") {
+        size += WireFormat.getStringSize(2, errorMsg)
+      }
+      size += WireFormat.getVarint32Size(size) + WireFormat.getTagSize(fieldNumber, WireType.LENGTH_DELIMITED)
+      return size
+    }
+    fun getSizeNoTag(): Int {
+      var size = 0
+      if (code != 0) {
+        size += WireFormat.getInt32Size(1, code)
+      }
+      if (errorMsg != "") {
+        size += WireFormat.getStringSize(2, errorMsg)
+      }
+      return size
+    }
+  }
+
+
+  fun mergeWith (other: DirectionResponse) {
+    code = other.code
+    errorMsg = other.errorMsg
+  }
+
+  fun mergeFromWithSize (input: CodedInputStream, expectedSize: Int) {
+    val builder = DirectionResponse.BuilderDirectionResponse()
+    mergeWith(builder.parseFromWithSize(input, expectedSize).build())}
+
+  fun mergeFrom (input: CodedInputStream) {
+    val builder = DirectionResponse.BuilderDirectionResponse()
+    mergeWith(builder.parseFrom(input).build())}
+  fun getSize(fieldNumber: Int): Int {
+    var size = 0
+    if (code != 0) {
+      size += WireFormat.getInt32Size(1, code)
+    }
+    if (errorMsg != "") {
+      size += WireFormat.getStringSize(2, errorMsg)
+    }
+    size += WireFormat.getVarint32Size(size) + WireFormat.getTagSize(fieldNumber, WireType.LENGTH_DELIMITED)
+    return size
+  }
+  fun getSizeNoTag(): Int {
+    var size = 0
+    if (code != 0) {
+      size += WireFormat.getInt32Size(1, code)
+    }
+    if (errorMsg != "") {
+      size += WireFormat.getStringSize(2, errorMsg)
+    }
+    return size
+  }
+}
+
+