I can say with complete confidence, I can make what you need, I'm very familiar with Unity, Networking and XML. I would be happy to help you with your goal, I understand TCP/UDP networking and sending xml information, my only question in regards to that is, why not json? Well either case I have ample experience and I can get this done for you, I would love to hear more if you have the time to reply and I can learn more about your project.