Get local IP address about bluesocket HOT 1 OPEN

private static func getOutboundAddress(hostname: String, port: Int32) -> String {
        var tmpDatagramSocket: Socket?
        defer {
            tmpDatagramSocket?.close()
        }
        
        var result: String = ""
        do {
            tmpDatagramSocket = try Socket.create(family: .inet, type: .datagram, proto: .udp)
            try tmpDatagramSocket!.connect(to: hostname, port: port)
            
            var addr_in = sockaddr_in()
            addr_in.sin_len = UInt8(MemoryLayout.size(ofValue: addr_in))
            addr_in.sin_family = sa_family_t(AF_INET)
            var len = socklen_t(addr_in.sin_len)
            
            _ = withUnsafeMutablePointer(to: &addr_in, {
                $0.withMemoryRebound(to: sockaddr.self, capacity: 1) {
                    getsockname(tmpDatagramSocket!.socketfd, $0, &len)
                }
            })
            
            let address = Socket.Address.ipv4(addr_in)
            if let hostNameAndPort = Socket.hostnameAndPort(from: address) {
                result = hostNameAndPort.hostname
            }
        } catch {
            // ignore
        }
        return result
}