Open a tcp socket and continuously read the stream in a non-working way. Items in the stream are seperated by a cartridge return. Please use regex to remove the non numeric characters from the item.

public async Task<int> SumNumbersFromTcpStream(string hostname, int port)
{
    var tcpClient = new TcpClient();
    tcpClient.Connect(hostname, port);
    var s = tcpClient.GetStream();
    var reader = new StreamReader(s);
    var total = 0;
    while (true)
    {
        var line = await reader.ReadLineAsync();
        if (line == null) continue;

        var matches = Regex.Matches(line, @"\d+");
        foreach (Match match in matches)
        {
            total += int.Parse(match.Value);
        }
    }
}