listener := pubnub.NewListener()
doneConnect := make(chan bool)
donePublish := make(chan bool)

msg := map[string]interface{}{
    "msg": "Hello world",
}
go func() {
    for {
        select {
        case status := <-listener.Status:
            switch status.Category {
            case pubnub.PNDisconnectedCategory:
                // This event happens when radio / connectivity is lost
            case pubnub.PNConnectedCategory:
                // Connect event. You can do stuff like publish, and know you'll get it.
                // Or just use the connected event to confirm you are subscribed for
                // UI / internal notifications, etc
                doneConnect <- true
            case pubnub.PNReconnectedCategory:
                // Happens as part of our regular operation. This event happens when
                // radio / connectivity is lost, then regained.
            }
        case message := <-listener.Message:
            // Handle new message stored in message.message
            if message.Channel != "" {
                // Message has been received on channel group stored in
                // message.Channel
            } else {
                // Message has been received on channel stored in
                // message.Subscription
            }
            if msg, ok := message.Message.(map[string]interface{}); ok {
                fmt.Println(msg["msg"])
            }
            /*
                log the following items with your favorite logger
                    - message.Message
                    - message.Subscription
                    - message.Timetoken
            */

            donePublish <- true
        case <-listener.Presence:
            // handle presence
        }
    }
}()

pn.AddListener(listener)

msg := map[string]interface{}{
        "msg": "Hello world!"
}

pn.Subscribe().
    Channels([]string{"hello_world"}).
    Execute()

<-doneConnect

response, status, err := pn.Publish().
    Channel("hello_world").Message(msg).Execute()

if err != nil {
     // Request processing failed.
     // Handle message publish error
}