How to extract the connection from function with return in swift?

Question

I am trying to connect with my smart lamp by LIFXClient framework, but unfortunately I do not understand how to use this library. The library looks very simple, here is link.

I'm trying changing color by this function:

LIFXClient.connect(host: .ipv4(IPv4Address("192.168.1.4")!)).then { client in
    return client.light.setColor(color: .orange)
}

But this creating new connection with different local port every time I use it. Because of lack of free ports after changing colors quickly I can not make a new connection with lamp.

I have been trying a few days not to create a new connection, but to use just one, unfortunately I do not know how to do this.

The function from the LIFXClient to connect to lamp:

public class LIFXClient: LIFXConnection {
    public class func connect(host: NWEndpoint.Host, port: NWEndpoint.Port = 56700, queue: DispatchQueue = DispatchQueue(label: "LIFX Queue"), source: UInt32 = UInt32.random(), target: UInt64 = 0) -> Promise<LIFXClient> {
        return NWConnection(host: host, port: port, using: .udp).connect(queue: queue).map { connection in
            return LIFXClient(connection: connection, source: source, target: target)
        }
    }
}

If I only could save client.light reference it would be great, but unfortunately I can't do that:

var myClient: LIFXClient

LIFXClient.connect(host: .ipv4(IPv4Address("192.168.1.4")!)).then { client in
    myClient = client.light
    return client.light.setColor(color: .orange)
}

Developer of this framework does not write back to me, and I really have no ideas how to solve it. Thank you very much for all your help.