diff --git a/rosbridge_library/src/rosbridge_library/capabilities/fragmentation.py b/rosbridge_library/src/rosbridge_library/capabilities/fragmentation.py
index a5b582034..947eeb704 100644
--- a/rosbridge_library/src/rosbridge_library/capabilities/fragmentation.py
+++ b/rosbridge_library/src/rosbridge_library/capabilities/fragmentation.py
@@ -76,8 +76,6 @@ def fragment(self, message, fragment_size, mid=None):
         if message_length <= fragment_size:
             return [message]
 
-        msg_id = message.get("id", None)
-
         expected_duration = int(math.ceil(math.ceil(message_length / float(fragment_size))) * self.protocol.delay_between_messages)
 
         log_msg = "sending " + str(int(math.ceil(message_length / float(fragment_size)))) + " parts [fragment size: " + str(fragment_size) +"; expected duration: ~" + str(expected_duration) + "s]"
diff --git a/rosbridge_library/test/capabilities/test_call_service.py b/rosbridge_library/test/capabilities/test_call_service.py
index d91f85f27..7098321a9 100755
--- a/rosbridge_library/test/capabilities/test_call_service.py
+++ b/rosbridge_library/test/capabilities/test_call_service.py
@@ -70,8 +70,7 @@ def cb(msg, cid=None):
 
     def test_call_service_fail(self):
         # Dummy service that instantly fails
-        service_server = rospy.Service("set_bool_fail", SetBool,
-                                       lambda req: None)
+        _ = rospy.Service("set_bool_fail", SetBool, lambda req: None)
 
         proto = Protocol("test_call_service_fail")
         s = CallService(proto)
diff --git a/rosbridge_library/test/experimental/complex_srv+tcp/test_non-ros_service_server_complex-srv.py b/rosbridge_library/test/experimental/complex_srv+tcp/test_non-ros_service_server_complex-srv.py
index 7d6dc494a..72ddefef0 100755
--- a/rosbridge_library/test/experimental/complex_srv+tcp/test_non-ros_service_server_complex-srv.py
+++ b/rosbridge_library/test/experimental/complex_srv+tcp/test_non-ros_service_server_complex-srv.py
@@ -34,7 +34,7 @@
 
 def calculate_service_response(request):
     request_object = json.loads(request)                                        # parse string for service request
-    args = request_object["args"]                                               # get parameter field (args)
+#    args = request_object["args"]                                              # get parameter field (args)
 #    count = int(args["count"] )                                                # get parameter(s) as described in corresponding ROS srv-file
 #
 #    message = ""                                                               # calculate service response
diff --git a/rosbridge_server/scripts/rosbridge_websocket.py b/rosbridge_server/scripts/rosbridge_websocket.py
index 9424fd330..0d4935f52 100755
--- a/rosbridge_server/scripts/rosbridge_websocket.py
+++ b/rosbridge_server/scripts/rosbridge_websocket.py
@@ -191,7 +191,7 @@ def __init__(self):
         if "--unregister_timeout" in sys.argv:
             idx = sys.argv.index("--unregister_timeout") + 1
             if idx < len(sys.argv):
-                unregister_timeout = float(sys.argv[idx])
+                RosbridgeWebSocket.unregister_timeout = float(sys.argv[idx])
             else:
                 print("--unregister_timeout argument provided without a value.")
                 sys.exit(-1)
diff --git a/rosbridge_server/src/rosbridge_server/udp_handler.py b/rosbridge_server/src/rosbridge_server/udp_handler.py
index e60cd11d0..b1c17f7ea 100644
--- a/rosbridge_server/src/rosbridge_server/udp_handler.py
+++ b/rosbridge_server/src/rosbridge_server/udp_handler.py
@@ -1,6 +1,5 @@
 import rospy
 from rosbridge_library.rosbridge_protocol import RosbridgeProtocol
-from rosbridge_library.util import bson
 
 from twisted.internet.protocol import DatagramProtocol
 
@@ -66,7 +65,6 @@ def stopProtocol(self):
             cls.client_count_pub.publish(cls.clients_connected)
         rospy.loginfo("Client disconnected. %d clients total.", cls.clients_connected)
     def send_message(self, message):
-        binary = isinstance(message, bson.BSON)
         self.write(message)
     def check_origin(self, origin):
         return False
diff --git a/setup.cfg b/setup.cfg
index 77879a209..35b53629f 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -5,5 +5,5 @@ ignore-words-list = miror
 count = True
 max-complexity = 36
 max-line-length = 228
-select = C,E262,E266,E4,E5,E7,E9,F4,F5,F6,F7,F81,F82,F83,F9,W1,W6
+select = C,E262,E266,E4,E5,E7,E9,F,W1,W6
 show-source = True