title: Using GCM on Android
body: <p>I want develop android chat app with the GCM. I had a series of questions : </p>
  
  <blockquote>
    <p>1) Whether messages are sent only on devices that have Google accounts
    or devices that do not have a Google account to get the message?</p>
    
    <p>2) Any restrictions on sending messages or the number of requests per
    second or minute there?</p>
  </blockquote>
  
  <p>** Please do not negative points and do not remove my question. I looked on the internet and did not receive a definitive answer. Here's why I raised my question.</p>
  
  <p>Thanks your all my dear friends &lt;3</p>