feat!(binding_mqtt): remove discoveryTimeout config parameter

lib/src/binding_mqtt/constants.dart

@@ -32,8 +32,8 @@ const mqttContextUri = "http://www.example.org/mqtt-binding#";
 /// The default prefix used in MQTT-related compact URIs (CURIEs) in TDs.
 const defaultMqttPrefix = "mqv";
 
-/// Default timeout length used for reading properties and discovering TDs.
-const defaultTimeout = Duration(seconds: 10);
+/// Default timeout length used for reading properties.
+const defaultReadTimeout = Duration(seconds: 10);
 
 /// Default duration MQTT connections are kept alive in seconds.
 const defaultKeepAlivePeriod = 20;

lib/src/binding_mqtt/mqtt_config.dart

@@ -14,18 +14,18 @@ import "constants.dart";
 /// The default [QoS] values for the different operation types will be used if
 /// no Quality of Service is defined in the respective form.
 ///
-/// If no [readTimeout] or [discoveryTimeout] is defined, a [defaultTimeout] of
-/// 10 seconds will be used. Furthermore, the [keepAlivePeriod] defaults to 20
-/// seconds.
+/// If no [readTimeout] is defined, a [defaultReadTimeout] of
+/// 10 seconds will be used.
+/// Furthermore, the [keepAlivePeriod] defaults to a [defaultKeepAlivePeriod] of
+/// 20 seconds.
 class MqttConfig {
   /// Creates a new [MqttConfig] object.
   MqttConfig({
     this.defaultReadQoS = QoS.atMostOnce,
     this.defaultWriteQoS = QoS.atMostOnce,
     this.defaultActionQoS = QoS.atMostOnce,
     this.defaultSubscribeQoS = QoS.atLeastOnce,
-    this.readTimeout = defaultTimeout,
-    this.discoveryTimeout = defaultTimeout,
+    this.readTimeout = defaultReadTimeout,
     this.keepAlivePeriod = defaultKeepAlivePeriod,
   });
 
@@ -50,11 +50,6 @@ class MqttConfig {
   /// If no value has been read until the timeout has expired, the operation
   /// will be canceled.
   final Duration readTimeout;
-
-  /// Timeout value used for discovery using MQTT.
-  ///
-  /// The discovery process will be aborted once the timeout has expired.
-  final Duration discoveryTimeout;
 }
 
 /// Enum for indicating the default Quality of Service (QoS) that should be used