Thread in Delphi - time-problem

Hi

In an application I comunicate with a mobile device. If the device is not in the dockingstation it is possible, that calling a function will respond after a timeout of i.e. 60 seconds. So my idea was to program this in a thread.

  TPdaSyncThread = class(TThread)
  private
    procedure doProcess;
  protected
    procedure Execute; override;
  public
    constructor Create(... myParams);
  end;

constructor TPdaSyncThread.Create(... myParams);
begin
  FreeOnTerminate := True;
  inherited Create(False);
  ....
end;

procedure TPdaSyncThread.doProcess;
begin
  Sleep(30000);  //just to "simulate" calling the function that will return after a timeout
end;

procedure TPdaSyncThread.Execute;
begin
  while not Terminated do
  begin
    Synchronize(self,doProcess);
  end;
end;

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In the main-thread I have a procedure "AppMessage" (Application.Onmessage := "AppMessage". During the 30 seconds (sleep) this procedure is never called. I think I didn't understand something with threading??