> You can leave a socket open in the background (although you do need a periodic keep alive but the period can be pretty long.) to receive push messages without

> You can leave a socket open in the background (although you do need a periodic keep alive but the period can be pretty long.) to receive push messages without draining the battery (as long as the server doesn’t spam it.). This only works on a platform where apps can run in the background indefinitely. Small memory, limited CPU, and battery life means apps have short life-spans on phones. This is why there is a push notification service for mobile platforms.