diff --git a/src/Rammbock/core.py b/src/Rammbock/core.py
index a1edf4c..4a79e82 100644
--- a/src/Rammbock/core.py
+++ b/src/Rammbock/core.py
@@ -193,6 +193,14 @@ def _start_client(self, client_class, ip=None, port=None, name=None, timeout=Non
             client.set_own_ip_and_port(ip=ip, port=port)
         return self._clients.add(client, name)
 
+    def _is_client(self, client_name):
+        client_exist = True
+        try:
+            self._clients.get_with_name(client_name)
+        except KeyError:
+            client_exist = False
+        return client_exist
+
     def _get_protocol(self, protocol):
         try:
             protocol = self._protocols[protocol] if protocol else None
@@ -206,6 +214,19 @@ def get_client_protocol(self, name=None):
         """
         return self._clients.get(name).protocol_name or ''
 
+    def update_client_protocol(self, protocol, client=None):
+        """Updates client protocol. If client is not
+        given then update the latest client.
+
+        Examples:
+        | Update client protocol | protocol_name |
+        | Update client protocol | protocol_name | client_name |
+        """
+        protocol = self._get_protocol(protocol)
+        client = self._clients.get(client)
+        client.set_protocol(protocol)
+        client.update_message_stream()
+
     def accept_connection(self, name=None, alias=None):
         """Accepts a connection to server identified by `name` or the latest
         server if `name` is empty.
diff --git a/src/Rammbock/networking.py b/src/Rammbock/networking.py
index 2fe28e3..53d5740 100644
--- a/src/Rammbock/networking.py
+++ b/src/Rammbock/networking.py
@@ -306,6 +306,12 @@ def connect_to(self, server_ip, server_port):
         self._is_connected = True
         return self
 
+    def set_protocol(self, protocol):
+        self._protocol = protocol
+
+    def update_message_stream(self):
+        self._message_stream = self._get_message_stream()
+
 
 class UDPClient(_Client, _UDPNode):
     pass
diff --git a/src/Rammbock/templates/primitives.py b/src/Rammbock/templates/primitives.py
index b7c2e1a..5a6351c 100644
--- a/src/Rammbock/templates/primitives.py
+++ b/src/Rammbock/templates/primitives.py
@@ -137,7 +137,7 @@ def __init__(self, length, name, default_value=None, align=None):
         self.length = Length(length, align)
 
     def _encode_value(self, value, message, little_endian=False):
-        self._raise_error_if_no_value(value, message)
+        # self._raise_error_if_no_value(value, message)
         length, aligned_length = self.length.decode_lengths(message)
         binary = to_bin_of_length(length, value)
         binary = binary[::-1] if little_endian else binary
@@ -162,7 +162,7 @@ def _get_int_value(self, message, value):
         return to_twos_comp(value, bin_len)
 
     def _encode_value(self, value, message, little_endian=False):
-        self._raise_error_if_no_value(value, message)
+        # self._raise_error_if_no_value(value, message)
         value = self._get_int_value(message, value)
         return UInt._encode_value(self, value, message, little_endian)
 
@@ -202,7 +202,7 @@ def __init__(self, length, name, default_value=None):
             raise AssertionError('Binary field length must be static. Length: %s' % length)
 
     def _encode_value(self, value, message, little_endian=False):
-        self._raise_error_if_no_value(value, message)
+        # self._raise_error_if_no_value(value, message)
         minimum_binary = to_bin(value)
         length, aligned = self.length.decode_lengths(message, len(minimum_binary))
         binary = to_bin_of_length(self._byte_length(length), value)