Explain timeout and connection drop

[inkeliz]

Currently there's some situations when node drops the connections:

• Invalid packet
• Timeout

I think it should be writen at "keepalive" how long and how often that packet must be sent. Also, if sending other types of messages (like "push", "confirm_ack") will "reset" the timeout counter. Also, if it's mandatory to reply the keepalive.

[zhyatt]

@wezrule @SergiySW Since you both have looked at this recently, can one of you take a look at making these updates?

[dsiganos]

I have the same questions and I have not yet found authoritative answers.
I mostly got connections and keepalives to work by trial and error.
@clemahieu ?