expose cleanSession and will mqtt connection options

.scalafmt.conf

@@ -6,6 +6,5 @@ docstrings                 = JavaDoc
 indentOperator             = spray
 maxColumn                  = 120
 rewrite.rules              = [RedundantBraces, RedundantParens, SortImports]
-spaces.inImportCurlyBraces = true
 unindentTopLevelOperators  = true
 binPack.callSite           = true

mqtt/src/main/scala/akka/stream/alpakka/mqtt/Mqtt.scala

@@ -73,11 +73,22 @@ final case class MqttConnectionSettings(
     broker: String,
     clientId: String,
     persistence: MqttClientPersistence,
-    auth: Option[(String, String)] = None
+    auth: Option[(String, String)] = None,
+    cleanSession: Boolean = true,
+    will: Option[Will] = None
 ) {
+  def withBroker(broker: String) =
+    copy(broker = broker)
+
   def withAuth(username: String, password: String) =
     copy(auth = Some((username, password)))
 
+  def withCleanSession(cleanSession: Boolean) =
+    copy(cleanSession = cleanSession)
+
+  def withWill(will: Will) =
+    copy(will = Some(will))
+
   def withClientId(clientId: String) =
     copy(clientId = clientId)
 }
@@ -93,6 +104,8 @@ object MqttConnectionSettings {
 
 final case class MqttMessage(topic: String, payload: ByteString)
 
+final case class Will(message: MqttMessage, qos: MqttQoS, retained: Boolean)
+
 object MqttMessage {
 
   /**
@@ -146,6 +159,10 @@ private[mqtt] trait MqttConnectorLogic { this: GraphStageLogic =>
         connectOptions.setUserName(user)
         connectOptions.setPassword(password.toCharArray)
     }
+    connectionSettings.will.foreach { will =>
+      connectOptions.setWill(will.message.topic, will.message.payload.toArray, will.qos.byteValue.toInt, will.retained)
+    }
+    connectOptions.setCleanSession(connectionSettings.cleanSession)
     client.connect(connectOptions, (), connectHandler)
   }
 

mqtt/src/test/scala/akka/stream/alpakka/mqtt/scaladsl/MqttSourceSpec.scala

@@ -5,7 +5,7 @@ package akka.stream.alpakka.mqtt.scaladsl
 
 import akka.actor.ActorSystem
 import akka.stream._
-import akka.stream.alpakka.mqtt.{ MqttConnectionSettings, MqttMessage, MqttQoS, MqttSourceSettings }
+import akka.stream.alpakka.mqtt._
 import akka.stream.scaladsl._
 import akka.stream.testkit.scaladsl.TestSink
 import akka.testkit.TestKit
@@ -41,6 +41,7 @@ class MqttSourceSpec
   val topic1 = "source-spec/topic1"
   val topic2 = "source-spec/topic2"
   val secureTopic = "source-spec/secure-topic1"
+  val willTopic = "source-spec/will"
 
   val sourceSettings = connectionSettings.withClientId(clientId = "source-spec/source")
   val sinkSettings = connectionSettings.withClientId(clientId = "source-spec/sink")
@@ -169,5 +170,42 @@ class MqttSourceSpec
         elem2.futureValue shouldBe MqttMessage(topic1, ByteString("ohi"))
       }
     }
+
+    "support will message" in {
+      import system.dispatcher
+
+      val (binding, connection) = Tcp().bind("localhost", 1337).toMat(Sink.head)(Keep.both).run()
+
+      val ks = connection.map(
+        _.handleWith(Tcp().outgoingConnection("localhost", 1883).viaMat(KillSwitches.single)(Keep.right))
+      )
+
+      whenReady(binding) { _ =>
+        val settings = MqttSourceSettings(
+            sourceSettings
+              .withClientId("source-spec/testator")
+              .withBroker("tcp://localhost:1337")
+              .withWill(Will(MqttMessage(willTopic, ByteString("ohi")), MqttQoS.AtLeastOnce, retained = true)),
+            Map(willTopic -> MqttQoS.AtLeastOnce))
+        val source = MqttSource(settings, 8)
+
+        val sub = source.toMat(Sink.head)(Keep.left).run()
+        whenReady(sub) { _ =>
+          whenReady(ks)(_.shutdown())
+        }
+      }
+
+      {
+        val settings =
+          MqttSourceSettings(sourceSettings.withClientId("source-spec/executor"),
+            Map(willTopic -> MqttQoS.AtLeastOnce))
+        val source = MqttSource(settings, 8)
+
+        val (sub, elem) = source.toMat(Sink.head)(Keep.both).run()
+        whenReady(sub) { _ =>
+          elem.futureValue shouldBe MqttMessage(willTopic, ByteString("ohi"))
+        }
+      }
+    }
   }
 }

mqtt/src/test/travis/acl

@@ -1,10 +1,11 @@
 # anonymous user
 topic source-spec/topic1
 topic source-spec/topic2
+topic source-spec/will
 topic sink-spec/topic1
 topic source-test/topic1
 topic source-test/topic2
 
 user username1
 topic source-spec/secure-topic1
-topic sink-spec/secure-topic1
+topic sink-spec/secure-topic1