title: What is this generated string in firebase?
body: <p>I have a mqtt subscriber in python that listens for ESP8266's in different rooms posting their temperature.</p>
  
  <p>When they post the temperature I add the data to firebase using the following:</p>
  
  <pre><code>// msq.topic == room name
  // msq.payload is the temperature
  root.child(msq.topic).push(
      {
          'temperature' : msg.payload.decode("UTF-8"),
          'date_time'   : str(datetime.now()
      }
  )
  </code></pre>
  
  <p>When I get the data in firebase it looks like this:
  <a href="https://i.stack.imgur.com/SYB5E.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/SYB5E.png" alt="enter image description here"></a></p>
  
  <p>What is LEB9y19SraBRSGxamvp or where does it come from? (and the other unique ID's)
  Can I change it to something more meaningful so that it is easier to get data from firebase? Or have I possibly designed this badly? 
  Has anyone any suggestions to make it better?</p>