WCF (or alternative) Controller-worker setup on machines across the internet

We have a .net monitoring service that runs on several PCs installed across the UK at client locations. We need to be able to communicate with these pc's from a central web application in order to send them individual commands and request data from them.

These PCs all have internet connectivity but may 开发者_高级运维be behind firewalls. Because these PCs may not be contactable directly from a URL, we need some way for these "workers" to connect to the centralised sever, identify themselves, and then respond to commands from the server.

We are looking at WCF P2P as a solution, but have a few concerns about this (can you target an individual worker with this, and will we suffer problems with NATs and firewalls). We also considered using XMPP as a protocol to communicate.

Is P2P the way forwards, or is there a better solution (either WCF or otherwise).

Thanks

I suggest using netPeerTcpBinding.

There is a good article here.