diff --git a/custom_components/mikrotik_router/.translations/ru.json b/custom_components/mikrotik_router/.translations/ru.json
new file mode 100644
index 0000000..3b0fc8d
--- /dev/null
+++ b/custom_components/mikrotik_router/.translations/ru.json
@@ -0,0 +1,41 @@
+{
+    "config": {
+        "title": "Mikrotik Роутер",
+        "step": {
+            "user": {
+                "title": "Mikrotik Роутер",
+                "description": "Настройка интеграции роутера Mikrotik.",
+                "data": {
+                    "name": "Название интеграции",
+                    "host": "Хост",
+                    "port": "Порт",
+                    "username": "Имя пользователя",
+                    "password": "Пароль",
+                    "ssl": "Использовать SSL",
+                    "unit_of_measurement": "Единицы измерения"
+                }
+            }
+        },
+        "error": {
+            "name_exists": "Имя уже используется.",
+            "cannot_connect": "Нет связи с Mikrotik.",
+            "ssl_handshake_failure": "Ошибка SSL-соединения",
+            "connection_timeout": "Таймаут подключения к Mikrotik.",
+            "wrong_login": "Неверные имя пользователя или пароль."
+        }
+    },
+    "options": {
+        "step": {
+            "init": {
+                    "data": {}
+            },
+            "device_tracker": {
+                "data": {
+                    "scan_interval": "Период сканирования (требуется перезагрузка HA)",
+                    "track_arp": "Показывать в интерфейсе MAC и IP клиентов",
+                    "unit_of_measurement": "Единицы измерения"
+                }
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/custom_components/mikrotik_router/helper.py b/custom_components/mikrotik_router/helper.py
index db3eee3..194a306 100644
--- a/custom_components/mikrotik_router/helper.py
+++ b/custom_components/mikrotik_router/helper.py
@@ -2,13 +2,15 @@
 
 import logging
 
+from voluptuous import Optional
+
 _LOGGER = logging.getLogger(__name__)
 
 
 # ---------------------------
 #   from_entry
 # ---------------------------
-def from_entry(entry, param, default="") -> dict:
+def from_entry(entry, param, default="") -> str:
     """Validate and return str value from Mikrotik API dict"""
     if param not in entry:
         return default
@@ -88,7 +90,7 @@ def parse_api(
 # ---------------------------
 #   get_uid
 # ---------------------------
-def get_uid(entry, key, key_search, keymap) -> str:
+def get_uid(entry, key, key_search, keymap) -> Optional(str):
     """Get UID for data list"""
     uid = None
     if not key_search:
@@ -111,7 +113,7 @@ def get_uid(entry, key, key_search, keymap) -> str:
 # ---------------------------
 #   generate_keymap
 # ---------------------------
-def generate_keymap(data, key_search) -> dict:
+def generate_keymap(data, key_search) -> Optional(dict):
     """Generate keymap"""
     if not key_search:
         return None
diff --git a/custom_components/mikrotik_router/mikrotik_controller.py b/custom_components/mikrotik_router/mikrotik_controller.py
index 0949ced..7e43b1d 100644
--- a/custom_components/mikrotik_router/mikrotik_controller.py
+++ b/custom_components/mikrotik_router/mikrotik_controller.py
@@ -3,6 +3,8 @@
 from datetime import timedelta
 import asyncio
 import logging
+
+from homeassistant.core import callback
 from homeassistant.helpers.dispatcher import async_dispatcher_send
 from homeassistant.helpers.event import async_track_time_interval
 
@@ -72,6 +74,7 @@ class MikrotikControllerData:
     # ---------------------------
     #   force_update
     # ---------------------------
+    @callback
     async def force_update(self, _now=None):
         """Trigger update by timer"""
         await self.async_update()
@@ -79,6 +82,7 @@ class MikrotikControllerData:
     # ---------------------------
     #   force_fwupdate_check
     # ---------------------------
+    @callback
     async def force_fwupdate_check(self, _now=None):
         """Trigger hourly update by timer"""
         await self.async_fwupdate_check()
diff --git a/custom_components/mikrotik_router/mikrotikapi.py b/custom_components/mikrotik_router/mikrotikapi.py
index 210afbb..da72b3b 100644
--- a/custom_components/mikrotik_router/mikrotikapi.py
+++ b/custom_components/mikrotik_router/mikrotikapi.py
@@ -4,6 +4,9 @@ import ssl
 import logging
 import time
 from threading import Lock
+
+from voluptuous import Optional
+
 from .exceptions import ApiEntryNotFound
 from .const import (
     DEFAULT_LOGIN_METHOD,
@@ -64,7 +67,7 @@ class MikrotikAPI:
     # ---------------------------
     #   disconnect
     # ---------------------------
-    def disconnect(self) -> bool:
+    def disconnect(self):
         """Disconnect from Mikrotik device."""
         self._connected = False
         self._connection = None
@@ -161,7 +164,7 @@ class MikrotikAPI:
     # ---------------------------
     #   path
     # ---------------------------
-    def path(self, path) -> list:
+    def path(self, path) -> Optional(list):
         """Retrieve data from Mikrotik API."""
         if not self._connected or not self._connection:
             if self._connection_epoch > time.time() - self._connection_retry_sec:
@@ -238,7 +241,7 @@ class MikrotikAPI:
         entry_found = False
         if not self._connected or not self._connection:
             if self._connection_epoch > time.time() - self._connection_retry_sec:
-                return None
+                return False
 
             if not self.connect():
                 return False
@@ -313,7 +316,7 @@ class MikrotikAPI:
         entry_found = False
         if not self._connected or not self._connection:
             if self._connection_epoch > time.time() - self._connection_retry_sec:
-                return None
+                return False
 
             if not self.connect():
                 return False
@@ -382,7 +385,7 @@ class MikrotikAPI:
     # ---------------------------
     #   get_traffic
     # ---------------------------
-    def get_traffic(self, interfaces) -> list:
+    def get_traffic(self, interfaces) -> Optional(list):
         """Get traffic stats"""
         traffic = None
         if not self._connected or not self._connection: