diff --git a/server/server.py b/server/server.py
index b4dba55..8b2ee3e 100644
--- a/server/server.py
+++ b/server/server.py
@@ -35,14 +35,14 @@ class Server:
         self.homeDirectory = ""
         self.executor.baseDir = Executor(self.homeDirectory)
 
-    def parseCommand(self, command: str) -> str:
+    def parseCommand(self, command: str) -> None:
         if command == "LINOK":
-            return "LINOK"
+            self.networkInstance.sendMessage("LINOK".encode('UTF-8'))
         elif command == "LINERROR":
-            return "LINERROR"
+            self.networkInstance.sendMessage("LINERROR".encode('UTF-8'))
         parsedCommand = command.split(" ")
         if len(parsedCommand) > 3:
-            return "ERROR"
+            self.networkInstance.sendMessage("ERROR".encode('UTF-8'))
         # TODO: Ez igy gecironda, ezt meg kene csinalni rendesen.
         elif len(parsedCommand) == 1:
             return self.execute(parsedCommand[0])
@@ -51,42 +51,48 @@ class Server:
         elif len(parsedCommand) == 3:
             return self.execute(parsedCommand[0], parsedCommand[1], parsedCommand[2])
 
-    def execute(self, command: str, firstParam: str = "", secondParam: str = "") -> str:
+    def execute(self, command: str, firstParam: str = "", secondParam: str = "") -> None:
         if self.homeDirectory == "" or self.executor.currentDirectory == "" or self.executor.baseDir == "":
             raise Exception("Directories must not be empty string. Did the user log in?")
         if command == "MKD":
             if secondParam != "":
-                return "ERROR"
+                self.networkInstance.sendMessage("ERROR".encode('UTF-8'))
             else:
-                return self.executor.createDirectory(firstParam)
+                self.executor.createDirectory(firstParam)
+                self.networkInstance.sendMessage("OK".encode('UTF-8'))
         elif command == "RMD":
             if secondParam != "":
-                return "ERROR"
+                self.networkInstance.sendMessage("ERROR".encode('UTF-8'))
             else:
-                return self.executor.removeDirectory(firstParam)
+                self.executor.removeDirectory(firstParam)
+                self.networkInstance.sendMessage("OK".encode('UTF-8'))
         elif command == "GWD":
             if secondParam != "" or firstParam != "":
-                return "ERROR"
+                self.networkInstance.sendMessage("ERROR".encode('UTF-8'))
             else:
-                return self.executor.getCurrentDirectory()
+                self.executor.getCurrentDirectory()
+                self.networkInstance.sendMessage("OK".encode('UTF-8'))
         elif command == "CWD":
             if secondParam != "":
-                return "ERROR"
+                self.networkInstance.sendMessage("ERROR".encode('UTF-8'))
             else:
-                return self.executor.setCurrentDirectory(firstParam)
+                self.executor.setCurrentDirectory(firstParam)
+                self.networkInstance.sendMessage("OK".encode('UTF-8'))
         elif command == "LST":
             if secondParam != "" or firstParam != "":
-                return "ERROR"
+                self.networkInstance.sendMessage("ERROR".encode('UTF-8'))
             else:
-                return self.executor.listCurrentDirectoryContent()
+                self.executor.listCurrentDirectoryContent()
+                self.networkInstance.sendMessage("OK".encode('UTF-8'))
         elif command == "RMF":
             if secondParam != "":
-                return "ERROR"
+                self.networkInstance.sendMessage("ERROR".encode('UTF-8'))
             else:
-                return self.executor.removeFileInCurrentDirectory(firstParam)
+                self.executor.removeFileInCurrentDirectory(firstParam)
+                self.networkInstance.sendMessage("OK".encode('UTF-8'))
         elif command == "UPL":
             if secondParam != "":
-                return "ERROR"
+                self.networkInstance.sendMessage("ERROR".encode('UTF-8'))
             else:
                 # TODO
                 # Megkapod a filenevet argumentumneknt
@@ -97,7 +103,7 @@ class Server:
                 pass
         elif command == "DNL":
             if secondParam != "":
-                return "ERROR"
+                self.networkInstance.sendMessage("ERROR".encode('UTF-8'))
             else:
                 # TODO
                 # Megkapod a filenevet arguemntumkent
@@ -107,7 +113,7 @@ class Server:
                 # Ha sikeres, OK valaszt megkapod, kulonben ERROR valaszt megkapod
                 pass
         else:
-            return "ERROR"
+            self.networkInstance.sendMessage("ERROR".encode('UTF-8'))
 
     def startServer(self):
         while True: