client and server works with bytes and nr18.space now

both parts now uses byteorder, int.from_bytes() and data.to_bytes(). to compare values,
raw data are cast to integer. furthermore encode() is nowhere used. at the moment the server
listen at nr18.space at port 10001.

client-clear.py

@@ -5,43 +5,57 @@
 # date: 26.07.2019
 # email: berhsi@web.de
 
-# client, who connects to localhost port 64000. If no status is given, he
-# reads from commandline until input is 0 or 1.
+# client, who connects to nr18.space at port 10001 to update the krautspace
+# door status. If no status is given as argument, he reads from stdin until
+# input is 0 or 1.
 
 import socket
-from sys import exit, argv
-from kodierung import string2bytes
+from sys import exit, argv, byteorder
 
 
 def check_arguments(argv):
-    
+    '''
+    Checks length and validity of command line argument vectors. If there is
+    no argument or argument is not valid, it returns None. Otherwise it
+    converts the string value into a byte value.
+    param 1: array of strings
+    return: None or byte value
+    '''
     if len(argv) == 1:
-        value = None
+        byte_value = None
     else:
         if argv[1].strip() == '0' or argv[1].strip() == '1':
-            value = argv[1].strip()
-            print('Set value to {}'.format(value))
+            i = int(argv[1].strip())
+            print('Set value to {}'.format(i))
+            byte_value = bytes([i])
         else:
-            value = None
-    return value
+            byte_value = None
+    return byte_value
 
 
 def read_argument():
-
+    '''
+    Reads from stdin until the given value is valid. Convert the given
+    string to a byte value and return this value.
+    return: byte value
+    '''
     status = None
 
     while status == None:
         buf = input('Enter new status (0/1): ')
         if buf == '0' or buf == '1':
-            status = buf
-    return buf
+            status = bytes([int(buf)])
+            print('Read status: {}'.format(status))
+    return status
 
 
 def main():
 
-    HOST = '127.0.0.1'
-    PORT = 64000
+    HOST = 'nr18.space'
+    PORT = 10001
+    BOM = byteorder
     STATUS = None
+    RESPONSE = None
 
     if check_arguments(argv) == None:
         STATUS = read_argument()
@@ -50,20 +64,28 @@ def main():
 
     with socket.socket(socket.AF_INET, socket.SOCK_STREAM, 0) as mySocket:
         print('Socket created')
-        mySocket.connect((HOST, PORT))
+        try:
+            mySocket.connect((HOST, PORT))
+        except Exception as e:
+            print('{}'.format(e))
+            exit(1)
         try:
             print('Send new status: {}'.format(STATUS))
-            bytestream = string2bytes(STATUS)
-            mySocket.send(bytestream)
+            mySocket.send(STATUS)
         except Exception as e:
             print('Error: {}'.format(e))
-            exit()
+            exit(2)
         try:
-            res = mySocket.recv(1)
-            print('Server returns: {}'.format(res.decode()))
-        finally:
-            mySocket.close()
+            RESPONSE = mySocket.recv(1)
+            print('Server returns: {}'.format(RESPONSE))
+            if RESPONSE == STATUS:
+                print('Status sucessfull updated')
+            else:
+                print('Failed to update status')
             print('Disconnect from server')
+        except Exception as e:
+            print('Error: {}'.format(e))
+            exit(3)
 
 
 if __name__ == '__main__':

server-clear.py

@@ -8,17 +8,21 @@
 
 import socket
 from time import time, ctime
-from sys import exit
+from sys import exit, byteorder
 
 
 def connection_handle(conn):
 
-    data = conn.recv(1).decode()
-    if data == '0' or data == '1':
+    bom = byteorder
+
+    raw_data = conn.recv(1)
+    print('Data recived: {}'.format(raw_data))
+    data = int.from_bytes(raw_data, bom)
+    if data == 0 or data == 1:
         if update_status(data) == True:
-            conn.send(data.encode())
+            conn.send(data.to_bytes(1, bom))
         else:
-            conn.send(b'3')
+            conn.send(b'\x03')
     else:
         print('Invalid argument')
         conn.send(b'3')
@@ -30,7 +34,7 @@ def update_status(data):
 
     try:
         print('Update status ...')
-        if data == '0':
+        if data == 0:
             status = 'false'
         else:
             status = 'true'
@@ -44,8 +48,8 @@ def update_status(data):
 
 def main():
 
-    HOST = '127.0.0.1'
-    PORT = 64000
+    HOST = 'nr18.space'
+    PORT = 10001
     
     with socket.socket(socket.AF_INET, socket.SOCK_STREAM, 0) as mySocket:
         print('Socket created')
@@ -57,7 +61,6 @@ def main():
             print('Error: unable to bind and listen')
             print('Error: {}'.format(e))
         while True:
-            conn = None
             try:
                 conn, addr = mySocket.accept()
                 print('Connection from {}:{}'.format(addr[0], addr[1]))
@@ -68,9 +71,6 @@ def main():
                 exit()
             except Exception as e:
                 print('Error: {}'.format(e))
-            finally:
-                if conn:
-                    conn.close()
 
 
 if __name__ == '__main__':