diff --git a/meshtastic/__main__.py b/meshtastic/__main__.py
index 5f1797e..3c1828d 100644
--- a/meshtastic/__main__.py
+++ b/meshtastic/__main__.py
@@ -1046,7 +1046,8 @@ def export_config(interface) -> str:
         else:
             configObj["module_config"] = prefs
 
-    config_txt = "# start of Meshtastic configure yaml\n"		#checkme - "config" (now changed to config_out) was used as a string here and a Dictionary above
+    config_txt = "# start of Meshtastic configure yaml\n"		#checkme - "config" (now changed to config_out)
+                                                                        #was used as a string here and a Dictionary above
     config_txt += yaml.dump(configObj)
     print(config_txt)
     return config_txt
diff --git a/meshtastic/ble_interface.py b/meshtastic/ble_interface.py
index a3d076d..16d1997 100644
--- a/meshtastic/ble_interface.py
+++ b/meshtastic/ble_interface.py
@@ -7,7 +7,7 @@ import struct
 import time
 import io
 from threading import Thread
-from typing import List, Optional, Tuple
+from typing import List, Optional
 
 import google.protobuf
 from bleak import BleakClient, BleakScanner, BLEDevice
diff --git a/meshtastic/stream_interface.py b/meshtastic/stream_interface.py
index 471111b..abaef4a 100644
--- a/meshtastic/stream_interface.py
+++ b/meshtastic/stream_interface.py
@@ -6,10 +6,10 @@ import threading
 import time
 import traceback
 
-import serial # type: ignore[import-untyped]
-
 from typing import Optional, cast
 
+import serial # type: ignore[import-untyped]
+
 from meshtastic.mesh_interface import MeshInterface
 from meshtastic.util import is_windows11, stripnl
 
diff --git a/meshtastic/tcp_interface.py b/meshtastic/tcp_interface.py
index cff92ba..791b8c2 100644
--- a/meshtastic/tcp_interface.py
+++ b/meshtastic/tcp_interface.py
@@ -49,7 +49,7 @@ class TCPInterface(StreamInterface):
         """Shutdown the socket.
         Note: Broke out this line so the exception could be unit tested.
         """
-        if socket:
+        if self.socket:		#mian: please check that this should be "if self.socket:"
             cast(socket.socket, self.socket).shutdown(socket.SHUT_RDWR)
 
     def myConnect(self) -> None:
@@ -82,4 +82,4 @@ class TCPInterface(StreamInterface):
         if self.socket:
             return self.socket.recv(length)
         else:
-            return None
\ No newline at end of file
+            return None
diff --git a/meshtastic/util.py b/meshtastic/util.py
index fce9256..d7fd352 100644
--- a/meshtastic/util.py
+++ b/meshtastic/util.py
@@ -366,7 +366,8 @@ def convert_mac_addr(val: bytes) -> Union[str, bytes]:
     val - base64 encoded value (ex: '/c0gFyhb'))
     returns: a string formatted like a mac address (ex: 'fd:cd:20:17:28:5b')
     """
-    if not re.match("[0-9a-f]{2}([-:]?)[0-9a-f]{2}(\\1[0-9a-f]{2}){4}$", val):		#FIXME - does the regex have to be bytes too to match val since val is bytes?
+    if not re.match("[0-9a-f]{2}([-:]?)[0-9a-f]{2}(\\1[0-9a-f]{2}){4}$", val):	#FIXME - does the regex have to be bytes too to
+                                                                                #match val since val is bytes?
         val_as_bytes: bytes = base64.b64decode(val)
         return hexstr(val_as_bytes)
     return val
@@ -650,7 +651,7 @@ def check_if_newer_version() -> Optional[str]:
     try:
         parsed_act_version = pkg_version.parse(act_version)
         parsed_pypi_version = pkg_version.parse(pypi_version)
-        #Note: if handed "None" when we can't download the pypi_version, 
+        #Note: if handed "None" when we can't download the pypi_version,
         #this gets a TypeError:
         #"TypeError: expected string or bytes-like object, got 'NoneType'"
         #Handle that below?