diff --git a/Protocol.md b/Protocol.md
index a2962c3..9101010 100644
--- a/Protocol.md
+++ b/Protocol.md
@@ -268,3 +268,7 @@ For static content in the mobile app :
 For device renaming from the mobile App, a server message is sent :
 
     {'name': 'device', 'action': 'update', 'data': {'id': 'L4HActuator_....', 'provider': 'L4HActuator', 'name': 'New name for light', 'modelName': 'CWMSwd-2B', 'vendor': 'Chacon', 'hardwareVersion': '1.0', 'softwareVersion': '1.0.6', 'macAddress': '...', 'type': '.dio1.wifi.genericSwitch.switch.', 'roomName': '...', 'roomId': '...', 'image': None, 'isNew': False}}
+
+For plug setting's to set the blue status light on or off :
+
+    {"method":"POST","path":"/device/L4HActuator_..../action/quietmode","parameters":{"value":1},"id":9}
diff --git a/pyproject.toml b/pyproject.toml
index ad2cba5..e4a8caa 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "dio-chacon-wifi-api"
-version = "1.0.0"
+version = "1.0.1"
 description = "Python library for DIO Chacon wifi's protocol for shutters and switches"
 authors = ["cnico"]
 license = "GNU Lesser General Public License v3 or later (LGPLv3+)"
diff --git a/src/dio_chacon_wifi_api/exceptions.py b/src/dio_chacon_wifi_api/exceptions.py
index dfc1bdc..d23d4fa 100644
--- a/src/dio_chacon_wifi_api/exceptions.py
+++ b/src/dio_chacon_wifi_api/exceptions.py
@@ -1,4 +1,4 @@
-"""Exceptions for DIOChaconAPIClient."""
+"""Exceptions for DIOChacon API."""
 
 
 class DIOChaconAPIError(Exception):
@@ -6,3 +6,10 @@ class DIOChaconAPIError(Exception):
 
     def __init__(self, *args) -> None:
         Exception.__init__(self, *args)
+
+
+class DIOChaconInvalidAuthError(Exception):
+    """Invalid auth detected"""
+
+    def __init__(self, *args) -> None:
+        Exception.__init__(self, *args)
diff --git a/src/dio_chacon_wifi_api/session.py b/src/dio_chacon_wifi_api/session.py
index 4627ae5..677b4db 100644
--- a/src/dio_chacon_wifi_api/session.py
+++ b/src/dio_chacon_wifi_api/session.py
@@ -9,6 +9,8 @@
 
 import aiohttp
 
+from .exceptions import DIOChaconInvalidAuthError
+
 MAX_FAILED_ATTEMPTS = 5
 
 STATE_CONNECTED = "connected"
@@ -88,6 +90,11 @@ async def on_request_end(session, trace_config_ctx, params):
         self._aiohttp_session = aiohttp.ClientSession(trace_configs=[trace_config])
         async with self._aiohttp_session.post(url=self._auth_url, data=payload_data, headers=headers_token) as resp:
             resp_json = await resp.json()
+            if resp_json["status"] == 400:
+                err_msg = resp_json["data"]
+                _LOGGER.debug("Invalid auth response received : %s", err_msg)
+                await self._aiohttp_session.close()
+                raise DIOChaconInvalidAuthError(err_msg)
             self._sessionToken = str(resp_json["data"]["sessionToken"])
             _LOGGER.debug("SessionToken of authentication : " + self._sessionToken)
 
diff --git a/tests/test_const.py b/tests/test_const.py
index 738193f..6abcb13 100644
--- a/tests/test_const.py
+++ b/tests/test_const.py
@@ -1,5 +1,5 @@
 # coding: utf-8
-"""Tests client.py. DIOChaconAPIClient class."""
+"""Tests consts."""
 from dio_chacon_wifi_api.const import DeviceTypeEnum
 
 
diff --git a/tests/test_exception.py b/tests/test_exception.py
new file mode 100644
index 0000000..15eba0c
--- /dev/null
+++ b/tests/test_exception.py
@@ -0,0 +1,14 @@
+# coding: utf-8
+"""Tests exceptions."""
+import pytest
+from dio_chacon_wifi_api.exceptions import DIOChaconAPIError
+from dio_chacon_wifi_api.exceptions import DIOChaconInvalidAuthError
+
+
+def test_exceptions() -> None:
+
+    with pytest.raises(DIOChaconAPIError):
+        raise DIOChaconAPIError("Dumb test coverage")
+
+    with pytest.raises(DIOChaconInvalidAuthError):
+        raise DIOChaconInvalidAuthError("Dumb 2")