Automatically register a new endpoint on expiration

[demurgos]

If getMessages is not called for more than 2 minutes, the current endpoint is disconnected.

Trying to perform any call with the registrationToken leads to an error 404: {"errorCode":729,"message":"You must create an endpoint before performing this operation."}.

We should detect this kind of error and register a new endpoint.

[grigori-gru]

Hello! Is there any way to solve this problem? I get error every second when when connected.