; CreateTCPServer Example
; -----------------------

; This program is server AND client at once: it listens on a
; port, then connects to itself over the loopback address.

port=4001

; CreateTCPServer returns a server handle, or 0 on failure
server=CreateTCPServer(port)
If server=0 Then
    Print "Could not listen on port "+port+" (it may be in use)"
Else
    Print "Server: listening on port "+port

    ; Open a client connection to our own server
    client=OpenTCPStream("127.0.0.1",port)
    If client=0 Then
        Print "Client: could not connect"
    Else
        Print "Client: connected to 127.0.0.1:"+port

        ; The server accepts the incoming connection - poll briefly,
        ; because AcceptTCPStream returns 0 until one has arrived
        accepted=0
        For try=1 To 100
            accepted=AcceptTCPStream(server)
            If accepted<>0 Then Exit
            Delay 10
        Next

        If accepted=0 Then
            Print "Server: no connection arrived"
        Else
            Print "Server: connection accepted"

            ; TCP streams read and write just like files
            WriteLine client,"Hello server!"
            Print "Client: sent 'Hello server!'"
            Print "Server: received '"+ReadLine$(accepted)+"'"

            CloseTCPStream accepted
        EndIf
        CloseTCPStream client
    EndIf
    CloseTCPServer server
    Print "Server: closed"
EndIf

Print ""
Print "Press any key to close the example"
WaitKey

End