Store multiple TcpClient Connections - VB.NET - arrays

Question

I'm building an application that can communicate and send commands to game servers. In the gaming world we call this “rcon” for remote console, but in reality it's just a telnet session. After successful authentication, a text command can be issued to the server and a text response is sent back to the client.
Often times server admins/owners run multiple game servers and every server has its own distinct ip address, port & password. I would like my application to loop through a list/array/datatable/dictionary (or whatever method is best ) of servers, connect and authenticate to each server, then somehow store that connection so commands can be sent to it in the future (Without having to connect & authenticate again)
Below is the code I have that works for a single server. I store the TcpClient(client) & NetworkStream(stm) as global objects which keeps the connection/session open to the server. What is the best method for me to do this with multiple servers since each server will have it's own TcpClient & NetworkStream?
Is there some way for me to store each TcpClient(client) & NetworkStream(stm) in an array, dictionary or something? I'm completely lost with how to approach this.
Imports System.Net.Sockets
Imports System.Text
Imports System.Threading
Imports System.Security.Cryptography
Imports System.IO
Public Class Form1
Public client As TcpClient
Public stm As NetworkStream
Sub SendCmd(cmd As String)
Dim data
If cmd.Trim = "" Then
data = Encoding.GetEncoding(1252).GetBytes(cmd)
Else
data = Encoding.GetEncoding(1252).GetBytes(cmd & vbCrLf)
End If
stm.Write(data, 0, data.Length)
Dim resp As Byte() = New Byte(512) {}
Dim memStream = New MemoryStream()
Thread.Sleep(500)
Dim bytes As Integer = 0
If stm.DataAvailable Then
Do
Thread.Sleep(10)
bytes = stm.Read(resp, 0, resp.Length)
memStream.Write(resp, 0, bytes)
Loop While stm.DataAvailable
Dim responsedata As String = Encoding.GetEncoding(1252).GetString(memStream.ToArray())
If responsedata.Contains("### Digest seed: ") Then
'The server is asking for authentication: Login to the server now
Authenticate(responsedata)
End If
OutputRTB.Text &= responsedata
End If
memStream.Close()
End Sub
Sub GetPlayerList()
If stm.CanRead Then
Dim data = Encoding.GetEncoding(1252).GetBytes("bf2cc pl" & vbCrLf)
Dim PlayerDT As New DataTable
PlayerDT.Columns.Add("PlayerSlot", GetType(Integer))
PlayerDT.Columns.Add("HeroName", GetType(String))
PlayerDT.Columns.Add("Score", GetType(String))
PlayerDT.Columns.Add("HeroID", GetType(String))
PlayerDT.Columns.Add("PlayerID", GetType(String))
PlayerDT.Columns.Add("Level", GetType(Integer))
PlayerDT.Columns.Add("Class", GetType(String))
PlayerDT.Columns.Add("Ping", GetType(Integer))
stm.Write(data, 0, data.Length)
Dim resp As Byte() = New Byte(512) {}
Dim memStream = New MemoryStream()
Thread.Sleep(500)
Dim bytes As Integer = 0
If stm.DataAvailable Then
Do
Thread.Sleep(10)
bytes = stm.Read(resp, 0, resp.Length)
memStream.Write(resp, 0, bytes)
Loop While stm.DataAvailable
Dim responsedata As String = Encoding.GetEncoding(1252).GetString(memStream.ToArray())
If responsedata.Contains("### Digest seed: ") Then
'Login to the server
Authenticate(responsedata)
End If
OutputRTB.Text = responsedata.Replace(vbTab, "^")
Dim Rows() As String = responsedata.Split(Environment.NewLine)
For i = 0 To Rows.Length - 1
Dim Cols() As String = Rows(i).Split(vbTab)
If Cols.Length > 40 Then
PlayerDT.Rows.Add(Cols(0).ToString(), Cols(1).ToString(), Cols(37).ToString(), Cols(10).ToString(), Cols(47).ToString(), Cols(39).ToString(), Cols(34).ToString(), Cols(3).ToString)
End If
Next
End If
DataGridView1.DataSource = PlayerDT
DataGridView1.Update()
memStream.Close()
End If
End Sub
Sub Authenticate(ByVal rdata As String)
Dim DigestKeyStart As Integer = rdata.LastIndexOf(":") + 2
Dim DigestKeyLen As Integer = 16
Dim PWResponse As String = rdata.Substring(DigestKeyStart, DigestKeyLen) & PassTXT.Text
PWResponse = "login " & GenerateHash(PWResponse)
SendCmd(PWResponse)
End Sub
Private Function GenerateHash(ByVal SourceText As String) As String
Dim objMD5 As New System.Security.Cryptography.MD5CryptoServiceProvider
Dim arrData() As Byte
Dim arrHash() As Byte
' first convert the string to bytes (using UTF8 encoding for unicode characters)
arrData = System.Text.Encoding.UTF8.GetBytes(SourceText)
' hash contents of this byte array
arrHash = objMD5.ComputeHash(arrData)
' thanks objects
objMD5 = Nothing
' return formatted hash
Return ByteArrayToString(arrHash)
End Function
Private Function ByteArrayToString(ByVal arrInput() As Byte) As String
Dim strOutput As New System.Text.StringBuilder(arrInput.Length)
For i As Integer = 0 To arrInput.Length - 1
strOutput.Append(arrInput(i).ToString("X2"))
Next
Return strOutput.ToString().ToLower
End Function
Private Sub Form1_FormClosing(sender As System.Object, e As System.Windows.Forms.FormClosingEventArgs) Handles MyBase.FormClosing
stm.Close()
client.Close()
End Sub
Private Sub ConnectBTN_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ConnectBTN.Click
client = New TcpClient(ServerIPTXT.Text, PortTXT.Text)
stm = client.GetStream()
SendCmd(CommandTXT.Text)
End Sub
Private Sub SendCommandBTN_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles SendCommandBTN.Click
SendCmd(CommandTXT.Text)
End Sub
Private Sub GetPlayerListBTN_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles GetPlayerListBTN.Click
GetPlayerList()
End Sub
End Class
BTW This is my first post on stackoverflow, but I have learned so much from this site over the years =)