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unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, ExtCtrls, IdBaseComponent, IdComponent, IdTCPServer,
  IdTCPConnection, IdTCPClient;

type
  TForm1 = class(TForm)
    Timer1: TTimer;
    IdTCPClient1: TIdTCPClient;
    procedure Timer1Timer(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Timer1Timer(Sender: TObject);
begin
IdTCPClient1.Host := '127.0.0.0.1';
IdTCPClient1.Port := 750;
IdTCPClient1.Connect;
end;

procedure TForm1.FormCreate(Sender: TObject);
var s: String;
begin
s := IdTCPClient1.IOHandler.ReadLn;

if AnsiSameText(s, 'Hallo?') then
IdTCPClient1.IOHandler.WriteLn('Servus!');
end;

end.					

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var
  S: string;
begin
  S := IdTCPClient1.Socket.ReadLn;
  //...
end;					

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procedure TForm1.Timer1Timer(Sender: TObject); 
var
  s: String; 
begin 
  s := IdTCPClient1.IOHandler.ReadLn; 
  if AnsiSameText(s, 'Hallo?') then 
    IdTCPClient1.IOHandler.WriteLn('Servus!');  
end; 


procedure TForm1.FormCreate(Sender: TObject); 
begin
  IdTCPClient1.Host := '127.0.0.0.1'; 
  IdTCPClient1.Port := 750; 
  IdTCPClient1.Connect; 
end;