param socket_keepalive to set keep-alive on socket

[mohit]

Provide an option to enable setKeepAlive on the node TCP Socket for long running connections. This is a better option than pinging manually as mentioned in #530 and #247

[mohit]

The default should probably be true but is kept false to ensure that socket behavior is the same as previous versions unless explicitly changed.

[pesho]

+1. I've encountered the same situation (long subscribe connections becoming unreachable, without the client noticing). It can happen when a connection sits idle for a long period. This looks like the best solution so far.

[ghost]

👍 This is probably the right solution.
I was just about to implement it by myself.

http://www.tldp.org/HOWTO/html_single/TCP-Keepalive-HOWTO/

[brycebaril]

Will be in the next version. I've also wanted this for a while.

I would much rather have this default to true than false given it should fix a number of other issues, and I can't think of any particular reason it would break backwards compatibility.

Thoughts?

[brycebaril]

Released in v0.11.0 -- With the default set to true because I was already bumping the minor version anyway. Thanks!