Noob question: No streaming data for instrument manager about ib HOT 4 CLOSED

func main() {
    options := ib.EngineOptions{}
    engine, err := ib.NewEngine(options)
    if err != nil {
        log.Fatal(err)
    }

    rc := make(chan ib.Reply)

    req := &ib.RequestMarketData{}
    req.Contract = ib.Contract{
        Symbol:       "USD",
        SecurityType: "CASH",
        Exchange:     "IDEALPRO",
        Currency:     "ZAR"}

    req.SetID(engine.NextRequestID())

    engine.Send(req)

    for {
        select {
        case r := <-rc:
            fmt.Println(r)
            switch r.(type) {
            case *ib.TickPrice:
                tick := r.(*ib.TickPrice)
                switch tick.Type {
                case ib.TickLast:
                    fmt.Printf("%v: Last %v", tick.ID(), tick.Price)
                case ib.TickBid:
                    fmt.Printf("%v: Bid %v", tick.ID(), tick.Price)
                case ib.TickAsk:
                    fmt.Printf("%v: Ask %v", tick.ID(), tick.Price)
                }
            }
        }
    }
}

 engine,_:=ib.NewEngine(ib.EngineOptions{})
rc := make(chan ib.Reply)



mgr,_:=ib.NewInstrumentManager(engine, ib.Contract{
	Symbol:       "USD",
	SecurityType: "CASH",
	Exchange:     "IDEALPRO",
	Currency:     "ZAR",
})
s:=ib.RequestMarketDataType{
	MarketDataType: 1,
}
    
    notify:=mgr.Refresh()
engine.Send(&s)
engine.SubscribeAll(rc)

for {
	select {
       case <-notify:
                fmt.Println(mgr.Ask())   
	case r := <-rc:
		//whatever you want to do with engine responses
		
	}
}