diff --git a/xoa_driver/internals/hli_v1/testers/_base_tester.py b/xoa_driver/internals/hli_v1/testers/_base_tester.py
index 02a99d12..23f99ffa 100644
--- a/xoa_driver/internals/hli_v1/testers/_base_tester.py
+++ b/xoa_driver/internals/hli_v1/testers/_base_tester.py
@@ -52,11 +52,15 @@ class BaseTester(ABC, Generic[TesterStateStorage]):
     :type password: str, optional
     :param port: the port number for connection establishment, default to 22606
     :type port: int, optional
-    :param debug: `True` if debug log output from the tester is needed, and `False` otherwise
-    :type debug: int, optional
+    :param enable_logging: `True` if debug log output from the tester is needed, and `False` otherwise
+    :type enable_logging: bool
+    :param custom_logger: `None` allow to specify logger with custom configurations
+    :type enable_logging: CustomLogger | None
+    :param session_timeout: `130` Session timeout in seconds
+    :type session_timeout: int
     """
 
-    def __init__(self, host: str, username: str, password: str = "xena", port: int = 22606, *, enable_logging: bool = False, custom_logger: CustomLogger | None = None) -> None:
+    def __init__(self, host: str, username: str, password: str = "xena", port: int = 22606, *, enable_logging: bool = False, custom_logger: CustomLogger | None = None, session_timeout: int = 130) -> None:
         self.__host = host
         self.__port = port
         self._conn = TransportationHandler(
@@ -67,6 +71,7 @@ def __init__(self, host: str, username: str, password: str = "xena", port: int =
             self._conn,
             username,
             password=password,
+            timeout_seconds=session_timeout,
             keepalive=True,
         )
         """
diff --git a/xoa_driver/internals/hli_v1/testers/l23_tester.py b/xoa_driver/internals/hli_v1/testers/l23_tester.py
index 991610b7..16c32202 100644
--- a/xoa_driver/internals/hli_v1/testers/l23_tester.py
+++ b/xoa_driver/internals/hli_v1/testers/l23_tester.py
@@ -67,18 +67,23 @@ class L23Tester(BaseTester["testers_state.GenuineTesterLocalState"]):
     :type password: str, optional
     :param port: the port number for connection establishment, default to 22606
     :type port: int, optional
-    :param debug: `True` if debug log output from the tester is needed, and `False` otherwise
-    :type debug: int, optional
+    :param enable_logging: `True` if debug log output from the tester is needed, and `False` otherwise
+    :type enable_logging: bool
+    :param custom_logger: `None` allow to specify logger with custom configurations
+    :type enable_logging: CustomLogger | None
+    :param session_timeout: `130` Session timeout in seconds
+    :type session_timeout: int
     """
 
-    def __init__(self, host: str, username: str, password: str = "xena", port: int = 22606, *, enable_logging: bool = False, custom_logger: CustomLogger | None = None) -> None:
+    def __init__(self, host: str, username: str, password: str = "xena", port: int = 22606, *, enable_logging: bool = False, custom_logger: CustomLogger | None = None, session_timeout: int = 130) -> None:
         super().__init__(
             host=host,
             username=username,
             password=password,
             port=port,
             enable_logging=enable_logging,
-            custom_logger=custom_logger
+            custom_logger=custom_logger,
+            session_timeout=session_timeout
         )
 
         self._local_states = testers_state.GenuineTesterLocalState(host, port)
diff --git a/xoa_driver/internals/hli_v1/testers/l23ve_tester.py b/xoa_driver/internals/hli_v1/testers/l23ve_tester.py
index 35480f1d..f30eca46 100644
--- a/xoa_driver/internals/hli_v1/testers/l23ve_tester.py
+++ b/xoa_driver/internals/hli_v1/testers/l23ve_tester.py
@@ -37,18 +37,23 @@ class L23VeTester(BaseTester["testers_state.TesterLocalState"]):
     :type password: str, optional
     :param port: the port number for connection establishment, default to 22606
     :type port: int, optional
-    :param debug: `True` if debug log output from the tester is needed, and `False` otherwise
-    :type debug: int, optional
+    :param enable_logging: `True` if debug log output from the tester is needed, and `False` otherwise
+    :type enable_logging: bool
+    :param custom_logger: `None` allow to specify logger with custom configurations
+    :type enable_logging: CustomLogger | None
+    :param session_timeout: `130` Session timeout in seconds
+    :type session_timeout: int
     """
 
-    def __init__(self, host: str, username: str, password: str = "xena", port: int = 22606, *, enable_logging: bool = False, custom_logger: CustomLogger | None = None) -> None:
+    def __init__(self, host: str, username: str, password: str = "xena", port: int = 22606, *, enable_logging: bool = False, custom_logger: CustomLogger | None = None, session_timeout: int = 130) -> None:
         super().__init__(
             host=host,
             username=username,
             password=password,
             port=port,
             enable_logging=enable_logging,
-            custom_logger=custom_logger
+            custom_logger=custom_logger,
+            session_timeout=session_timeout
         )
 
         self._local_states = testers_state.TesterLocalState(host, port)
diff --git a/xoa_driver/internals/hli_v1/testers/l47_tester.py b/xoa_driver/internals/hli_v1/testers/l47_tester.py
index f75cad18..b879f386 100644
--- a/xoa_driver/internals/hli_v1/testers/l47_tester.py
+++ b/xoa_driver/internals/hli_v1/testers/l47_tester.py
@@ -44,18 +44,23 @@ class L47Tester(BaseTester["testers_state.GenuineTesterLocalState"]):
     :type password: str, optional
     :param port: the port number for connection establishment, default to 22606
     :type port: int, optional
-    :param debug: `True` if debug log output from the tester is needed, and `False` otherwise
-    :type debug: int, optional
+    :param enable_logging: `True` if debug log output from the tester is needed, and `False` otherwise
+    :type enable_logging: bool
+    :param custom_logger: `None` allow to specify logger with custom configurations
+    :type enable_logging: CustomLogger | None
+    :param session_timeout: `130` Session timeout in seconds
+    :type session_timeout: int
     """
 
-    def __init__(self, host: str, username: str, password: str = "xena", port: int = 22606, *, enable_logging: bool = False, custom_logger: CustomLogger | None = None) -> None:
+    def __init__(self, host: str, username: str, password: str = "xena", port: int = 22606, *, enable_logging: bool = False, custom_logger: CustomLogger | None = None, session_timeout: int = 130) -> None:
         super().__init__(
             host=host,
             username=username,
             password=password,
             port=port,
             enable_logging=enable_logging,
-            custom_logger=custom_logger
+            custom_logger=custom_logger,
+            session_timeout=session_timeout
         )
 
         self._local_states = testers_state.GenuineTesterLocalState(host, port)
diff --git a/xoa_driver/internals/hli_v1/testers/l47ve_tester.py b/xoa_driver/internals/hli_v1/testers/l47ve_tester.py
index a86b632b..a077eef0 100644
--- a/xoa_driver/internals/hli_v1/testers/l47ve_tester.py
+++ b/xoa_driver/internals/hli_v1/testers/l47ve_tester.py
@@ -21,18 +21,23 @@ class L47VeTester(L47Tester):
     :type password: str, optional
     :param port: the port number for connection establishment, default to 22606
     :type port: int, optional
-    :param debug: `True` if debug log output from the tester is needed, and `False` otherwise
-    :type debug: int, optional
+    :param enable_logging: `True` if debug log output from the tester is needed, and `False` otherwise
+    :type enable_logging: bool
+    :param custom_logger: `None` allow to specify logger with custom configurations
+    :type enable_logging: CustomLogger | None
+    :param session_timeout: `130` Session timeout in seconds
+    :type session_timeout: int
     """
 
-    def __init__(self, host: str, username: str, password: str = "xena", port: int = 22606, *, enable_logging: bool = False, custom_logger: CustomLogger | None = None) -> None:
+    def __init__(self, host: str, username: str, password: str = "xena", port: int = 22606, *, enable_logging: bool = False, custom_logger: CustomLogger | None = None, session_timeout: int = 130) -> None:
         super().__init__(
             host=host,
             username=username,
             password=password,
             port=port,
             enable_logging=enable_logging,
-            custom_logger=custom_logger
+            custom_logger=custom_logger,
+            session_timeout=session_timeout
         )
         self.version_no_minor = C_VERSIONNO_MINOR(self._conn)
         """
diff --git a/xoa_driver/internals/hli_v2/testers/_base_tester.py b/xoa_driver/internals/hli_v2/testers/_base_tester.py
index f7d36570..05ef2711 100644
--- a/xoa_driver/internals/hli_v2/testers/_base_tester.py
+++ b/xoa_driver/internals/hli_v2/testers/_base_tester.py
@@ -41,7 +41,26 @@
 
 # min version = rel v83.2 eq fw v446.5
 class BaseTester(ABC, Generic[TesterStateStorage]):
-    def __init__(self, host: str, username: str, password: str = "xena", port: int = 22606, *, enable_logging: bool = False, custom_logger: CustomLogger | None = None) -> None:
+    """
+    Basic Tester class of APIv2.
+
+    :param host: tester's address/hostname
+    :type host: str
+    :param username: username of the user
+    :type username: str
+    :param password: login password of the tester, defaults to "xena"
+    :type password: str, optional
+    :param port: the port number for connection establishment, default to 22606
+    :type port: int, optional
+    :param enable_logging: `True` if debug log output from the tester is needed, and `False` otherwise
+    :type enable_logging: bool
+    :param custom_logger: `None` allow to specify logger with custom configurations
+    :type enable_logging: CustomLogger | None
+    :param session_timeout: `130` Session timeout in seconds
+    :type session_timeout: int
+    """
+
+    def __init__(self, host: str, username: str, password: str = "xena", port: int = 22606, *, enable_logging: bool = False, custom_logger: CustomLogger | None = None, session_timeout: int = 130) -> None:
         self.__host = host
         self.__port = port
         self._conn = TransportationHandler(
@@ -52,6 +71,7 @@ def __init__(self, host: str, username: str, password: str = "xena", port: int =
             self._conn,
             username,
             password=password,
+            timeout_seconds=session_timeout,
             keepalive=True,
         )
         """
diff --git a/xoa_driver/internals/hli_v2/testers/l23_tester.py b/xoa_driver/internals/hli_v2/testers/l23_tester.py
index 082b81cb..552d83e1 100644
--- a/xoa_driver/internals/hli_v2/testers/l23_tester.py
+++ b/xoa_driver/internals/hli_v2/testers/l23_tester.py
@@ -55,17 +55,35 @@ def get_module_type(revision: str) -> Type:
 
 class L23Tester(BaseTester["testers_state.GenuineTesterLocalState"]):
     """
-    Representation of a physical Xena Valkyrie Tester.
+    This is a conceptual class of Xena Valkyrie Tester.
+    It is essentially an extended :class:`BaseTester`.
+
+
+    :param host: tester's address/hostname
+    :type host: str
+    :param username: username of the user
+    :type username: str
+    :param password: login password of the tester, defaults to "xena"
+    :type password: str, optional
+    :param port: the port number for connection establishment, default to 22606
+    :type port: int, optional
+    :param enable_logging: `True` if debug log output from the tester is needed, and `False` otherwise
+    :type enable_logging: bool
+    :param custom_logger: `None` allow to specify logger with custom configurations
+    :type enable_logging: CustomLogger | None
+    :param session_timeout: `130` Session timeout in seconds
+    :type session_timeout: int
     """
 
-    def __init__(self, host: str, username: str, password: str = "xena", port: int = 22606, *, enable_logging: bool = False, custom_logger: CustomLogger | None = None) -> None:
+    def __init__(self, host: str, username: str, password: str = "xena", port: int = 22606, *, enable_logging: bool = False, custom_logger: CustomLogger | None = None, session_timeout: int = 130) -> None:
         super().__init__(
             host=host,
             username=username,
             password=password,
             port=port,
             enable_logging=enable_logging,
-            custom_logger=custom_logger
+            custom_logger=custom_logger,
+            session_timeout=session_timeout
         )
 
         self._local_states = testers_state.GenuineTesterLocalState(host, port)
diff --git a/xoa_driver/internals/hli_v2/testers/l23ve_tester.py b/xoa_driver/internals/hli_v2/testers/l23ve_tester.py
index 3e7af826..01afcb3f 100644
--- a/xoa_driver/internals/hli_v2/testers/l23ve_tester.py
+++ b/xoa_driver/internals/hli_v2/testers/l23ve_tester.py
@@ -25,17 +25,35 @@ def get_module_type(revision: str) -> Type:
 
 class L23VeTester(BaseTester["testers_state.TesterLocalState"]):
     """
-    Representation of a virtual Xena Valkyrie Tester.
+    This is a conceptual class of Xena ValkyrieVE Tester.
+    It is essentially an extended :class:`BaseTester`.
+
+
+    :param host: tester's address/hostname
+    :type host: str
+    :param username: username of the user
+    :type username: str
+    :param password: login password of the tester, defaults to "xena"
+    :type password: str, optional
+    :param port: the port number for connection establishment, default to 22606
+    :type port: int, optional
+    :param enable_logging: `True` if debug log output from the tester is needed, and `False` otherwise
+    :type enable_logging: bool
+    :param custom_logger: `None` allow to specify logger with custom configurations
+    :type enable_logging: CustomLogger | None
+    :param session_timeout: `130` Session timeout in seconds
+    :type session_timeout: int
     """
 
-    def __init__(self, host: str, username: str, password: str = "xena", port: int = 22606, *, enable_logging: bool = False, custom_logger: CustomLogger | None = None) -> None:
+    def __init__(self, host: str, username: str, password: str = "xena", port: int = 22606, *, enable_logging: bool = False, custom_logger: CustomLogger | None = None, session_timeout: int = 130) -> None:
         super().__init__(
             host=host,
             username=username,
             password=password,
             port=port,
             enable_logging=enable_logging,
-            custom_logger=custom_logger
+            custom_logger=custom_logger,
+            session_timeout=session_timeout
         )
 
         self._local_states = testers_state.TesterLocalState(host, port)
diff --git a/xoa_driver/internals/hli_v2/testers/l47_tester.py b/xoa_driver/internals/hli_v2/testers/l47_tester.py
index 63868131..ce3a204c 100644
--- a/xoa_driver/internals/hli_v2/testers/l47_tester.py
+++ b/xoa_driver/internals/hli_v2/testers/l47_tester.py
@@ -32,17 +32,35 @@ def get_module_type(revision: str) -> "Type":
 
 class L47Tester(BaseTester["testers_state.GenuineTesterLocalState"]):
     """
-    Representation of a physical Xena Vulcan Tester.
+    This is a conceptual class of Xena Vulcan Tester.
+    It is essentially an extended :class:`BaseTester`.
+
+
+    :param host: tester's address/hostname
+    :type host: str
+    :param username: username of the user
+    :type username: str
+    :param password: login password of the tester, defaults to "xena"
+    :type password: str, optional
+    :param port: the port number for connection establishment, default to 22606
+    :type port: int, optional
+    :param enable_logging: `True` if debug log output from the tester is needed, and `False` otherwise
+    :type enable_logging: bool
+    :param custom_logger: `None` allow to specify logger with custom configurations
+    :type enable_logging: CustomLogger | None
+    :param session_timeout: `130` Session timeout in seconds
+    :type session_timeout: int
     """
 
-    def __init__(self, host: str, username: str, password: str = "xena", port: int = 22606, *, enable_logging: bool = False, custom_logger: CustomLogger | None = None) -> None:
+    def __init__(self, host: str, username: str, password: str = "xena", port: int = 22606, *, enable_logging: bool = False, custom_logger: CustomLogger | None = None, session_timeout: int = 130) -> None:
         super().__init__(
             host=host,
             username=username,
             password=password,
             port=port,
             enable_logging=enable_logging,
-            custom_logger=custom_logger
+            custom_logger=custom_logger,
+            session_timeout=session_timeout
         )
 
         self._local_states = testers_state.GenuineTesterLocalState(host, port)
diff --git a/xoa_driver/internals/hli_v2/testers/l47ve_tester.py b/xoa_driver/internals/hli_v2/testers/l47ve_tester.py
index ef8f1872..a2325be1 100644
--- a/xoa_driver/internals/hli_v2/testers/l47ve_tester.py
+++ b/xoa_driver/internals/hli_v2/testers/l47ve_tester.py
@@ -9,17 +9,35 @@
 
 class L47VeTester(L47Tester):
     """
-    Representation of a virtual Xena Vulcan Tester.
+    This is a conceptual class of Xena VulcanVE Tester.
+    It is essentially an extended :class:`BaseTester`.
+
+
+    :param host: tester's address/hostname
+    :type host: str
+    :param username: username of the user
+    :type username: str
+    :param password: login password of the tester, defaults to "xena"
+    :type password: str, optional
+    :param port: the port number for connection establishment, default to 22606
+    :type port: int, optional
+    :param enable_logging: `True` if debug log output from the tester is needed, and `False` otherwise
+    :type enable_logging: bool
+    :param custom_logger: `None` allow to specify logger with custom configurations
+    :type enable_logging: CustomLogger | None
+    :param session_timeout: `130` Session timeout in seconds
+    :type session_timeout: int
     """
 
-    def __init__(self, host: str, username: str, password: str = "xena", port: int = 22606, *, enable_logging: bool = False, custom_logger: CustomLogger | None = None) -> None:
+    def __init__(self, host: str, username: str, password: str = "xena", port: int = 22606, *, enable_logging: bool = False, custom_logger: CustomLogger | None = None, session_timeout: int = 130) -> None:
         super().__init__(
             host=host,
             username=username,
             password=password,
             port=port,
             enable_logging=enable_logging,
-            custom_logger=custom_logger
+            custom_logger=custom_logger,
+            session_timeout=session_timeout
         )
         self.version_no_minor = C_VERSIONNO_MINOR(self._conn)
         """
diff --git a/xoa_driver/internals/utils/session.py b/xoa_driver/internals/utils/session.py
index 044587da..2e4ebc3f 100644
--- a/xoa_driver/internals/utils/session.py
+++ b/xoa_driver/internals/utils/session.py
@@ -1,4 +1,5 @@
 import asyncio
+from contextlib import suppress
 from typing import (
     TYPE_CHECKING,
     Tuple
@@ -61,6 +62,13 @@ async def logon(self) -> "TesterSession":
             )
         return self
 
+    async def chang_timeout(self, seconds: int = 130) -> None:
+        """Modify session timeout, """
+        if not self.is_online:
+            raise RuntimeError("Timeout can be changet only after connection is established.")
+        self.timeout = seconds
+        await C_TIMEOUT(self._conn).set(self.timeout)
+
     def __handle_exceptions(self, fut: asyncio.Future) -> None:
         if fut.cancelled():
             return None
@@ -69,7 +77,8 @@ def __handle_exceptions(self, fut: asyncio.Future) -> None:
 
     async def __do_keepalive(self) -> None:
         while self._conn.is_connected:
-            await C_KEEPALIVE(self._conn).get()
+            with suppress(Exception):
+                await C_KEEPALIVE(self._conn).get()
             await asyncio.sleep(max(0, self.timeout - 5))
 
     @property