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$ dig @IP_ADDRESS(removed) -p 5356 c7lu2ylhzmwmmaoa2xgie6nihfxrn25frxauuifp5lxvtjgw4icq====._wireguard._udp.exampleniodns.org. SRV +noall +answer +additional

; <<>> DiG 9.10.6 <<>> @IP_ADDRESS(removed) -p 5356 c7lu2ylhzmwmmaoa2xgie6nihfxrn25frxauuifp5lxvtjgw4icq====._wireguard._udp.exampleniodns.org. SRV +noall +answer +additional
; (1 server found)
;; global options: +cmd
c7lu2ylhzmwmmaoa2xgie6nihfxrn25frxauuifp5lxvtjgw4icq====._wireguard._udp.exampleniodns.org. 0 IN SRV 0 0 51820 c7lu2ylhzmwmmaoa2xgie6nihfxrn25frxauuifp5lxvtjgw4icq====._wireguard._udp.exampleniodns.org.
c7lu2ylhzmwmmaoa2xgie6nihfxrn25frxauuifp5lxvtjgw4icq====._wireguard._udp.exampleniodns.org. 0 IN A 82.52.204.201
c7lu2ylhzmwmmaoa2xgie6nihfxrn25frxauuifp5lxvtjgw4icq====._wireguard._udp.exampleniodns.org. 0 IN TXT "txtvers=1" "pub=F9dNYWfLLMYBwNXMgnmoOW8W66WNwUogr+rvWaTW4gU=" "allowed=10.101.0.2/32"

2019-09-17 15:14:22.499290+0900 xctest[7603:427732] [si_destination_compare] send failed: Invalid argument
2019-09-17 15:14:22.499516+0900 xctest[7603:427732] [si_destination_compare] send failed: Undefined error: 0
NioDNS/Tests/DNSClientTests/DNSClientTests.swift:54: error: -[DNSClientTests.DNSClientTests testSRVRecordsAsync] : Asynchronous wait failed: Exceeded timeout of 5 seconds, with unfulfilled expectations: "getSRVRecords".

extension DNSClient {
    /// Connect to the dns server using TCP using NIOTransportServices. This is only available on iOS 12 and above.
    /// - parameters:
    ///   - group: EventLoops to use
    ///   - config: DNS servers to use
    /// - returns: Future with the NioDNS client. Use 
    public static func connectTS(on group: NIOTSEventLoopGroup, config: [SocketAddress]) -> EventLoopFuture<DNSClient> {
        guard let address = config.preferred else {
            return group.next().makeFailedFuture(MissingNameservers())
        }


        let dnsDecoder = DNSDecoder(group: group)
        
        return NIOTSDatagramBootstrap(group: group)
            .channelOption(ChannelOptions.socket(SocketOptionLevel(SOL_SOCKET), SO_REUSEADDR), value: 1)
            .channelOption(ChannelOptions.socket(SocketOptionLevel(SOL_SOCKET), SO_REUSEPORT), value: 1)
            .channelInitializer { channel in
                return channel.pipeline.addHandlers(dnsDecoder, DNSEncoder())
        }
        .connect(to: address)
        .map { channel -> DNSClient in
            let client = DNSClient(
                channel: channel,
                address: address,
                decoder: dnsDecoder
            )

            dnsDecoder.mainClient = client
            return client
        }
    }
    /// Connect to the dns server using TCP using NIOTransportServices. This is only available on iOS 12 and above.
    /// The DNS Host is read from /etc/resolv.conf
    /// - parameters:
    ///   - group: EventLoops to use
    public static func connectTS(on group: NIOTSEventLoopGroup) -> EventLoopFuture<DNSClient> {
        do {
            let configString = try String(contentsOfFile: "/etc/resolv.conf")
            let config = try ResolvConf(from: configString)

            return connectTS(on: group, config: config.nameservers)
        } catch {
            return group.next().makeFailedFuture(UnableToParseConfig())
        }
    }
}