diff --git a/server/rtty.py b/server/rtty.py
index ff80510..eaa7cf3 100755
--- a/server/rtty.py
+++ b/server/rtty.py
@@ -13,16 +13,20 @@ from aiohttp import web, WSMsgType
 
 class Devices:
     devs = {}
+
     def add(self, ws, mac):
         self.devs[mac] = {'ws': ws, 'active': 3}
+
     def active(self, mac):
         self.devs[mac]['active'] = 3
+
     def flush(self):
         for mac in list(self.devs):
             self.devs[mac]['active'] -= 1
             if self.devs[mac]['active'] == 0:
                 self.devs[mac]['ws'].close()
                 del self.devs[mac]
+
     def login(self, ws, mac):
         sid = md5((mac + str(random.uniform(1, 100))).encode('utf8')).hexdigest()
         dev = self.devs.get(mac)
@@ -34,14 +38,17 @@ class Devices:
         dev['ws'].send_str(json.dumps({'type': 'login', 'mac': mac, 'sid': sid}))
         syslog.syslog('new logged to ' + mac)
         return sid
+
     def logout(self, mac, sid):
         dev = self.devs.get(mac)
         del dev[sid]
         dev['ws'].send_str(json.dumps({'type': 'logout', 'mac': mac, 'sid': sid}))
+
     def send_data2user(self, msg):
         mac = msg['mac']
         sid = msg['sid']
         self.devs[mac][sid].send_str(json.dumps(msg))
+
     def send_data2device(self, msg):
         mac = msg['mac']
         sid = msg['sid']
@@ -124,4 +131,4 @@ def keepalive(loop):
 loop = asyncio.get_event_loop()
 loop.call_later(5, keepalive, loop)
 
-web.run_app(app, port = port)
\ No newline at end of file
+web.run_app(app, port = port)