title: End of response to an AT command
body: <p>How to be sure what is end of an AT command send to GSM module? </p>
  
  <p>I need some character or string that represent end of AT command for every case due to finding when whole response is received. </p>
  
  <p>I guess it have something with "\r\n" sequence but, this sequence could be at the beginning of AT command response?</p>