Alpakka MQTT Streaming not receiving message

[kirankbs]

I am trying to setting up small example to stream MQTT messages but not successful.

import akka.Done
import akka.actor.ActorSystem
import akka.stream.OverflowStrategy
import akka.stream.alpakka.mqtt.streaming.MqttCodec.DecodeError
import akka.stream.alpakka.mqtt.streaming._
import akka.stream.alpakka.mqtt.streaming.scaladsl.{ActorMqttClientSession, Mqtt}
import akka.stream.scaladsl.{BroadcastHub, Keep, Sink, Source, Tcp}
import akka.util.ByteString

import scala.concurrent.duration.DurationInt
import scala.concurrent.{Await, Promise}

object Main {
  def main(args: Array[String]): Unit = {

    implicit val system: ActorSystem = ActorSystem("MqttClient")

    val host = "localhost"
    val port = 1883

    val connect = Connect("some-client-id", ConnectFlags.None)
    val subscribe = Subscribe("measurements")
    val pubAck = PubAck(PacketId(1))

    val settings = MqttSessionSettings()
    val clientSession = ActorMqttClientSession(settings)

    val (client, clientSource) = Source
      .queue[Command[Nothing]](2, OverflowStrategy.backpressure)
      .toMat(BroadcastHub.sink)(Keep.both)
      .run()

    val subscribed = Promise[Done]()

    Source
      .fromGraph(clientSource)
      .via(
        Mqtt
          .clientSessionFlow(clientSession, ByteString("1"))
          .join(Tcp().outgoingConnection(host, port))
      )
      .wireTap(Sink.foreach[Either[DecodeError, Event[_]]] {
        case Right(Event(conAck: ConnAck, carry: Option[_])) =>
          println(s"--> Client Connected $conAck and $carry")
          subscribed.success(Done)
        case Right(Event(sub: SubAck, carry: Option[_])) =>
          println(s"--> Client Subscribed $sub and carry: $carry")
          subscribed.success(Done)
        case Right(Event(p: Publish, carry: Option[_])) =>
          println(s"--> Client published $p and carry: $carry")
          client.offer(Command(pubAck.copy(packetId = p.packetId.get)))
        case Right(event: Event[_]) => println(s"unknown event $event")
        case Left(error) => println(s"failure $error")
      })
      .runWith(Sink.ignore)

    client.offer(Command(connect))
    client.offer(Command(subscribe))
    Await.ready(subscribed.future, 3.seconds)

  }
}

Response:

--> Client Connected ConnAck(ConnAckFlags(1),ConnAckReturnCode(0)) and None
--> Client Subscribed SubAck(PacketId(1),Vector(ControlPacketFlags(1))) and carry: None

Command:

mosquitto_pub -d  -h localhost -p 1883 -u 7f9a441e-11f9-4e87-9b6a-1bfa2ce67329 -t 'measurements' -m '[{"name": "measurement1", "value": 10000}]'

I am unable to receive messages.

Please help me to spot anything I am missing!