title: Unlimited keepalive in MQTT
body: <p>Currently developing something like "smart home" and I have few different devices in my home. All of them connected to <code>OpenHab</code> via <code>MQTT</code>. I'm using <code>Paho MQTT library</code> (Python) for my purposes. </p>
  
  <p>Generally, MQTT has "keepalive" property. This property describes how much time my client will be connected (AFAIK it sends the ping to the server) to MQTT server when there are no updates on the subscribed topic. </p>
  
  <p>But here I have a huge problem. Needed topic could be updated once per hour or even once per few days/months. Let's say that this is indoor alarm.
  How can I avoid that keepalive timeout or ignore that field? Could it be unlimited?</p>