Use the default def

net-mqtt.cabal

@@ -49,7 +49,7 @@ library
     , conduit-extra >=1.3.0 && <1.5
     , containers >=0.5.0 && <0.7
     , crypton-connection >=0.3.0
-    , data-default-class
+    , data-default-class >=0.1.2
     , deepseq >=1.4.3.0 && <1.5
     , monad-loops >=0.4.3
     , network-conduit-tls ==1.4.*
@@ -79,6 +79,7 @@ executable mqtt-example
     , conduit-extra >=1.3.0 && <1.5
     , containers >=0.5.0 && <0.7
     , crypton-connection >=0.3.0
+    , data-default-class >=0.1.2
     , deepseq >=1.4.3.0 && <1.5
     , monad-loops >=0.4.3
     , net-mqtt
@@ -109,6 +110,7 @@ executable mqtt-watch
     , conduit-extra >=1.3.0 && <1.5
     , containers >=0.5.0 && <0.7
     , crypton-connection >=0.3.0
+    , data-default-class >=0.1.2
     , deepseq >=1.4.3.0 && <1.5
     , monad-loops >=0.4.3
     , net-mqtt
@@ -148,6 +150,7 @@ test-suite mqtt-test
     , conduit-extra >=1.3.0 && <1.5
     , containers >=0.5.0 && <0.7
     , crypton-connection >=0.3.0
+    , data-default-class >=0.1.2
     , deepseq >=1.4.3.0 && <1.5
     , lens
     , monad-loops >=0.4.3

package.yaml

@@ -39,6 +39,7 @@ dependencies:
 - crypton-connection   >= 0.3.0
 - monad-loops          >= 0.4.3
 - time                 >= 1.9
+- data-default-class   >= 0.1.2
 
 library:
   source-dirs: src

src/Network/MQTT/Client.hs

@@ -158,10 +158,7 @@ mqttConfig = MQTTConfig{_hostname="", _port=1883, _connID="",
                         _msgCB=NoCallback,
                         _protocol=Protocol311, _connProps=mempty,
                         _connectTimeout=180000000,
-                        _tlsSettings=def
-                          {settingDisableCertificateValidation=False,
-                           settingDisableSession=False,
-                           settingUseServerName=False},
+                        _tlsSettings=def,
                         _pingPeriod=30000000,
                         _pingPatience=90000000}