detman wrote:So what is the verdict, can the CC3000 WifiShield from Adafruit make an HTTP REST POST to a website that has a static IP using the Adafruit_CC3000_Client library?
Sure.
The problems only come in when you have a server in your home with an address like 192.168.10.20 (or any other address in the private block) and want to connect to it from outside your LAN. Those address blocks are classified non-routable on the public internet. That limits applies regardless of the hardware you're using for the server or the network connection though.. a million dollars worth of Cisco routers and mainframes will be inaccessible to the public internet if they all have addresses in the 10.x.x.x block.
WRT making two CC3000s talk to each other: sure, you can do that. We have code that makes an Arduino with a CC3000 act as a webserver, so anything that can make an HTTP connection can do a query.