This doesn't work on corporate networks, or with ISPs who put their users behind a NAT (common for cellular modems). It also doesn't really fix the discovery pr

This doesn't work on corporate networks, or with ISPs who put their users behind a NAT (common for cellular modems). It also doesn't really fix the discovery problem - how does the client running on a different network know what dynamic DNS domain to look up? The easiest method is to use a hosted service to coordinate the two. Then you're back to the same problem. I'm not aware of a robust solution for IoT device discovery that doesn't use a cloud based system of some sort. All the alternatives are fiddly or vulnerable to weird router/ISP configurations. Not ideal when you want your product to be seamless.