private static void StartListener(string text)
{
bool done = false;
UdpClient listener = new UdpClient(listenPort);
listener.Client.ReceiveTimeout = 5000;
IPEndPoint groupEP = new IPEndPoint(IPAddress.Any, listenPort);
List <UDPResponse> responseList;
responseList = new List <UDPResponse>();
Stopwatch s = new Stopwatch();
s.Start();
try
{
while (!done)
{
//Console.WriteLine("timespan {0}\n", TimeSpan.FromSeconds(5));
//Console.WriteLine("s.elapsed {0}\n", s.Elapsed);
if (s.Elapsed < TimeSpan.FromSeconds(5))
{
Console.WriteLine("Waiting for replies");
byte[] bytes = listener.Receive(ref groupEP);
string remoteIPstring = groupEP.ToString();
string[] split = remoteIPstring.Split(new Char[] { ':' });
IPAddress remoteip = IPAddress.Parse(split[0]);
string receivedstring = Encoding.ASCII.GetString(bytes, 0, bytes.Length);
Console.WriteLine("\nReceived packet from {0}: {1}\n",
remoteip, receivedstring);
if (receivedstring.Length > (text.Length + 1)) //enough data received?
{
if (receivedstring.Substring(0, text.Length) == text) //answer packet matches search expression?
{
string receivedNumber = receivedstring.Substring((text.Length + 1),
(receivedstring.Length - text.Length - 1)); //get ID from reply data
bool validNumber = true;
foreach (char c in receivedNumber) //check if receivedNumber contains only numbers
{
if (!char.IsNumber(c))
{
validNumber = false;
}
}
if (validNumber)
{
UDPResponse resp = new UDPResponse(remoteip, int.Parse(receivedNumber));
responseList.Add(resp); //add discovered ID to list
Console.WriteLine("detected ID: {0}\n", receivedNumber); //show ID
}
else
{
Console.WriteLine("detected invalid character in ID: {0}\n", receivedNumber); //show error
}
}
}
}
else
{
done = true;
}
}
}
catch (Exception e)
{
if (e.HResult != -2147467259) // if exception is no socket timeout which is expected
{
Console.WriteLine(e.ToString()); // show thrown message
}
}
finally //clean up + show results
{
s.Stop();
listener.Close();
Console.WriteLine("\nfound {0} responses from the following IPs:\n", responseList.Count); //show list
foreach (UDPResponse response in responseList)
{
Console.WriteLine("IP: {0} replied with ID: {1}", response.Address.ToString(), response.Number.ToString());
}
}
}
//end crazy stuff
private List <UDPResponse> StartListener(String text)
{
List <UDPResponse> responseList = new List <UDPResponse>();
IPEndPoint groupEP = new IPEndPoint(IPAddress.Any, listenPort);
SendDiscover("#DSC-arduinosearch");
UdpClient listener = new UdpClient(listenPort);
listener.Client.ReceiveTimeout = BroadcastInterval;
Stopwatch s = new Stopwatch();
s.Start();
while (BCrunning) //loop forever here
{
if (!s.IsRunning) // restart timer if necessary
{
s = new Stopwatch();
s.Start();
}
if (s.Elapsed < TimeSpan.FromSeconds(5)) // timespan needs to be smaller than BroadcastInterval to work properly
{
try //try to get data from UDP listener and process it
{
byte[] bytes = listener.Receive(ref groupEP);
string remoteIPstring = groupEP.ToString();
string[] split = remoteIPstring.Split(new Char[] { ':' });
IPAddress remoteip = IPAddress.Parse(split[0]);
string receivedstring = Encoding.ASCII.GetString(bytes, 0, bytes.Length);
//MessageBox.Show(remoteIPstring, receivedstring, MessageBoxButtons.OK);
if (receivedstring.Length > (text.Length + 1)) //enough data received?
{
if (receivedstring.Substring(0, text.Length) == text) //answer packet matches search expression?
{
string receivedNumber = receivedstring.Substring((text.Length + 1),
(receivedstring.Length - text.Length - 1)); //get ID from reply data
bool validNumber = true;
foreach (char c in receivedNumber) //check if receivedNumber contains only numbers
{
if (!char.IsNumber(c))
{
validNumber = false;
}
}
if (validNumber)
{
UDPResponse resp = new UDPResponse(remoteip, int.Parse(receivedNumber));
responseList.Add(resp); //add discovered ID to list
string URLstring = "http://" + (resp.Address.ToString()) + "/";
//MessageBox.Show(URLstring, "calculated URL:", MessageBoxButtons.OK);
if (!listBox1.Items.Contains(URLstring))
{
listBox1.Items.Add(URLstring);
}
}
else
{
}
}
}
}
catch (Exception exc)
{
if (exc.HResult != -2147467259) // if exception is no socket timeout which is expected
{
MessageBox.Show(exc.ToString(), "error", MessageBoxButtons.OK);
}
}
finally
{
}
} // end if
else // if listener ran into timeout, we end up here
{
listener.Close();
s.Stop();
SendDiscover("#DSC-arduinosearch");
listener = new UdpClient(listenPort);
listener.Client.ReceiveTimeout = BroadcastInterval;
}
} // break detected; BCrunning was set to false via button2
listener.Close();
s.Stop();
return(responseList);
}
