diff --git a/src/mms/inc/mms_client_connection.h b/src/mms/inc/mms_client_connection.h
index 0ae05f2d..5126dbb9 100644
--- a/src/mms/inc/mms_client_connection.h
+++ b/src/mms/inc/mms_client_connection.h
@@ -285,6 +285,10 @@ MmsConnection_connectAsync(MmsConnection self, MmsError* mmsError, const char* s
 LIB61850_API bool
 MmsConnection_tick(MmsConnection self);
 
+/* NOTE: This function is for test purposes! */
+LIB61850_API void
+MmsConnection_sendRawData(MmsConnection self, MmsError* mmsError, uint8_t* buffer, int bufSize);
+
 /**
  * \brief Close the connection - not recommended
  *
diff --git a/src/mms/iso_mms/client/mms_client_connection.c b/src/mms/iso_mms/client/mms_client_connection.c
index 5635fd78..ad4d4356 100644
--- a/src/mms/iso_mms/client/mms_client_connection.c
+++ b/src/mms/iso_mms/client/mms_client_connection.c
@@ -4616,6 +4616,28 @@ exit_function:
     return;
 }
 
+void
+MmsConnection_sendRawData(MmsConnection self, MmsError* mmsError, uint8_t* buffer, int bufSize)
+{
+    if (getConnectionState(self) != MMS_CONNECTION_STATE_CONNECTED) {
+        if (mmsError)
+            *mmsError = MMS_ERROR_CONNECTION_LOST;
+        goto exit_function;
+    }
+
+    ByteBuffer* payload = IsoClientConnection_allocateTransmitBuffer(self->isoClient);
+
+    ByteBuffer_append(payload, buffer, bufSize);
+
+    sendMessage(self, payload);
+
+    if (mmsError)
+        *mmsError = MMS_ERROR_NONE;
+
+exit_function:
+    return;
+}
+
 void
 MmsServerIdentity_destroy(MmsServerIdentity* self)
 {