Event not fired after long period of time

[eightlines]

I've set up a Socket.IO server which relay's messages from the client (mobile device) to an OF application. The communication works initially when the server is started, but after a time period (say, 12 hours) the communication fails from the server to the OF side. The client-server communication continues to report console.log statements from the server side but the OF app doesn't receive an event.

A paired down version of the code is available here: https://gist.github.com/eightlines/a5f57f7a61731a913cb3c0ff33081085