diff --git a/hal/memory/lib_memory.c b/hal/memory/lib_memory.c
index adeb105a..74fde5b4 100644
--- a/hal/memory/lib_memory.c
+++ b/hal/memory/lib_memory.c
@@ -38,7 +38,6 @@ Memory_malloc(size_t size)
     return memory;
 }
 
-
 void*
 Memory_calloc(size_t nmemb, size_t size)
 {
@@ -50,7 +49,6 @@ Memory_calloc(size_t nmemb, size_t size)
     return memory;
 }
 
-
 void *
 Memory_realloc(void *ptr, size_t size)
 {
@@ -67,4 +65,3 @@ Memory_free(void* memb)
 {
     free(memb);
 }
-
diff --git a/src/iec61850/inc/iec61850_server.h b/src/iec61850/inc/iec61850_server.h
index d206b904..e3790011 100644
--- a/src/iec61850/inc/iec61850_server.h
+++ b/src/iec61850/inc/iec61850_server.h
@@ -3,7 +3,7 @@
  *
  *  IEC 61850 server API for libiec61850.
  *
- *  Copyright 2013-2022 Michael Zillgith
+ *  Copyright 2013-2023 Michael Zillgith
  *
  *  This file is part of libIEC61850.
  *
@@ -783,6 +783,14 @@ typedef void (*IedConnectionIndicationHandler) (IedServer self, ClientConnection
 LIB61850_API void
 IedServer_setConnectionIndicationHandler(IedServer self, IedConnectionIndicationHandler handler, void* parameter);
 
+/**
+ * \brief Ignore all requests from clients
+ * 
+ * \param self the instance of IedServer to configure.
+ * \param enable when true all requests from clients will be ignored
+ */
+void
+IedServer_ignoreClientRequests(IedServer self, bool enable);
 
 /**@}*/
 
diff --git a/src/iec61850/server/impl/ied_server.c b/src/iec61850/server/impl/ied_server.c
index 9416d200..c543a41d 100644
--- a/src/iec61850/server/impl/ied_server.c
+++ b/src/iec61850/server/impl/ied_server.c
@@ -1,7 +1,7 @@
 /*
  *  ied_server.c
  *
- *  Copyright 2013-2022 Michael Zillgith
+ *  Copyright 2013-2023 Michael Zillgith
  *
  *  This file is part of libIEC61850.
  *
@@ -1909,3 +1909,11 @@ IedServer_setTimeQuality(IedServer self, bool leapSecondKnown, bool clockFailure
 
     self->timeQuality = timeQuality;
 }
+
+void
+IedServer_ignoreClientRequests(IedServer self, bool enable)
+{
+    if (self->mmsServer) {
+        MmsServer_ignoreClientRequests(self->mmsServer, enable);
+    }
+}
diff --git a/src/mms/asn1/asn1_ber_primitive_value.c b/src/mms/asn1/asn1_ber_primitive_value.c
index 0dbd15bf..55cf626b 100644
--- a/src/mms/asn1/asn1_ber_primitive_value.c
+++ b/src/mms/asn1/asn1_ber_primitive_value.c
@@ -1,24 +1,24 @@
 /*
  *  asn1_ber_primitive_value.c
  *
- *  Copyright 2013-2020 Michael Zillgith
+ *  Copyright 2013-2022 Michael Zillgith
  *
- *	This file is part of libIEC61850.
+ *  This file is part of libIEC61850.
  *
- *	libIEC61850 is free software: you can redistribute it and/or modify
- *	it under the terms of the GNU General Public License as published by
- *	the Free Software Foundation, either version 3 of the License, or
- *	(at your option) any later version.
+ *  libIEC61850 is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
  *
- *	libIEC61850 is distributed in the hope that it will be useful,
- *	but WITHOUT ANY WARRANTY; without even the implied warranty of
- *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *	GNU General Public License for more details.
+ *  libIEC61850 is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
  *
- *	You should have received a copy of the GNU General Public License
- *	along with libIEC61850.  If not, see <http://www.gnu.org/licenses/>.
+ *  You should have received a copy of the GNU General Public License
+ *  along with libIEC61850.  If not, see <http://www.gnu.org/licenses/>.
  *
- *	See COPYING file for the complete license text.
+ *  See COPYING file for the complete license text.
  */
 
 #include "libiec61850_platform_includes.h"
diff --git a/src/mms/asn1/ber_decode.c b/src/mms/asn1/ber_decode.c
index 12078610..8a4866a8 100644
--- a/src/mms/asn1/ber_decode.c
+++ b/src/mms/asn1/ber_decode.c
@@ -1,7 +1,7 @@
 /*
  *  ber_decoder.c
  *
- *  Copyright 2013 Michael Zillgith
+ *  Copyright 2013-2022 Michael Zillgith
  *
  *  This file is part of libIEC61850.
  *
diff --git a/src/mms/asn1/ber_encoder.c b/src/mms/asn1/ber_encoder.c
index 63566f38..53a5d178 100644
--- a/src/mms/asn1/ber_encoder.c
+++ b/src/mms/asn1/ber_encoder.c
@@ -1,7 +1,7 @@
 /*
  *  ber_encoder.c
  *
- *  Copyright 2013 Michael Zillgith
+ *  Copyright 2013-2022 Michael Zillgith
  *
  *  This file is part of libIEC61850.
  *
@@ -356,6 +356,28 @@ BerEncoder_UInt32determineEncodedSize(uint32_t value)
     return size;
 }
 
+int
+BerEncoder_Int32determineEncodedSize(int32_t value)
+{
+    uint8_t* valueArray = (uint8_t*) &value;
+    uint8_t valueBuffer[5];
+
+    valueBuffer[0] = 0;
+
+    int i;
+    for (i = 0; i < 4; i++) {
+       valueBuffer[i + 1] = valueArray[i];
+    }
+
+#if (ORDER_LITTLE_ENDIAN == 1)
+    BerEncoder_revertByteOrder(valueBuffer + 1, 4);
+#endif
+
+    int size = BerEncoder_compressInteger(valueBuffer, 5);
+
+    return size;
+}
+
 int
 BerEncoder_determineLengthSize(uint32_t length)
 {
@@ -457,7 +479,6 @@ BerEncoder_encodeOIDToBuffer(const char* oidString, uint8_t* buffer, int maxBufL
                 requiredBytes--;
             }
         }
-
     }
 
     return encodedBytes;
diff --git a/src/mms/asn1/ber_integer.c b/src/mms/asn1/ber_integer.c
index 9a7e8030..01281e3f 100644
--- a/src/mms/asn1/ber_integer.c
+++ b/src/mms/asn1/ber_integer.c
@@ -1,7 +1,7 @@
 /*
  *  ber_integer.c
  *
- *  Copyright 2013-2020 Michael Zillgith
+ *  Copyright 2013-2022 Michael Zillgith
  *
  *  This file is part of libIEC61850.
  *
diff --git a/src/mms/inc/mms_server.h b/src/mms/inc/mms_server.h
index 7e6118d0..98e4c796 100644
--- a/src/mms/inc/mms_server.h
+++ b/src/mms/inc/mms_server.h
@@ -1,7 +1,7 @@
 /*
  *  mms_server.h
  *
- *  Copyright 2013-2018 Michael Zillgith
+ *  Copyright 2013-2023 Michael Zillgith
  *
  *  This file is part of libIEC61850.
  *
@@ -370,6 +370,9 @@ MmsServerConnection_getLocalAddress(MmsServerConnection self);
 LIB61850_INTERNAL void*
 MmsServerConnection_getSecurityToken(MmsServerConnection self);
 
+LIB61850_INTERNAL void
+MmsServer_ignoreClientRequests(MmsServer self, bool enable);;
+
 /**@}*/
 
 #ifdef __cplusplus
diff --git a/src/mms/inc_private/mms_server_internal.h b/src/mms/inc_private/mms_server_internal.h
index 780e1d74..727e97a3 100644
--- a/src/mms/inc_private/mms_server_internal.h
+++ b/src/mms/inc_private/mms_server_internal.h
@@ -135,7 +135,8 @@ struct sMmsServer {
 
     Map openConnections;
     Map valueCaches;
-    bool isLocked;
+
+    bool blockRequests;
 
     ByteBuffer* transmitBuffer; /* global buffer for encoding reports, delayed responses... */
 #if (CONFIG_MMS_THREADLESS_STACK != 1)
diff --git a/src/mms/inc_private/mms_server_libinternal.h b/src/mms/inc_private/mms_server_libinternal.h
index ac16e445..444989c9 100644
--- a/src/mms/inc_private/mms_server_libinternal.h
+++ b/src/mms/inc_private/mms_server_libinternal.h
@@ -1,7 +1,7 @@
 /*
  *  mms_server_libinternal.h
  *
- *  Copyright 2013-2022 Michael Zillgith
+ *  Copyright 2013-2023 Michael Zillgith
  *
  *  This file is part of libIEC61850.
  *
@@ -196,7 +196,7 @@ MmsServer_getConnectionCounter(MmsServer self);
 LIB61850_INTERNAL void
 MmsServer_stopListeningThreadless(MmsServer self);
 
-LIB61850_INTERNAL  const char*
+LIB61850_INTERNAL const char*
 MmsServer_getFilesystemBasepath(MmsServer self);
 
 #endif /* MMS_SERVER_LIBINTERNAL_H_ */
diff --git a/src/mms/iso_mms/server/mms_server.c b/src/mms/iso_mms/server/mms_server.c
index 3905b52d..ed2cf725 100644
--- a/src/mms/iso_mms/server/mms_server.c
+++ b/src/mms/iso_mms/server/mms_server.c
@@ -1,7 +1,7 @@
 /*
  *  mms_server.c
  *
- *  Copyright 2013-2020 Michael Zillgith
+ *  Copyright 2013-2023 Michael Zillgith
  *
  *  This file is part of libIEC61850.
  *
@@ -95,13 +95,13 @@ MmsServer_create(MmsDevice* device, TLSConfiguration tlsConfiguration)
         if (self->valueCaches == NULL)
             goto exit_error;
 
-        self->isLocked = false;
-
         self->transmitBuffer = ByteBuffer_create(NULL, CONFIG_MMS_MAXIMUM_PDU_SIZE);
 
         if (self->transmitBuffer == NULL)
             goto exit_error;
 
+        self->blockRequests = false;
+
 #if (CONFIG_MMS_SERVER_CONFIG_SERVICES_AT_RUNTIME == 1)
         self->fileServiceEnabled = true;
         self->dynamicVariableListServiceEnabled = true;
@@ -820,4 +820,8 @@ MmsServer_getFilesystemBasepath(MmsServer self)
 #endif
 }
 
-
+void
+MmsServer_ignoreClientRequests(MmsServer self, bool enable)
+{
+    self->blockRequests = enable;
+}
diff --git a/src/mms/iso_mms/server/mms_server_connection.c b/src/mms/iso_mms/server/mms_server_connection.c
index b14ecc3a..4f914081 100644
--- a/src/mms/iso_mms/server/mms_server_connection.c
+++ b/src/mms/iso_mms/server/mms_server_connection.c
@@ -665,6 +665,9 @@ handleConfirmedResponsePdu(
 static inline void
 MmsServerConnection_parseMessage(MmsServerConnection self, ByteBuffer* message, ByteBuffer* response)
 {
+    if (self->server->blockRequests)
+        return;
+
     uint8_t* buffer = message->buffer;
 
     if (message->size < 2)