Yes, you nailed it. I will be using this is an Ethernet active-active network design. The Cypress Oxygen 3 is a LTE gateway that will connect to the carriers wireless APN via a static IP. The only drawback to these are the constant keepalives so I'm anticipating about 2Gigs of data monthly. Unless I'm missing something here, I believe the USB connection would be active-failover which I believe can take up to 3 minutes to build the IPSec tunnel (VPN) and since this would be a PoS environment, this design is not an option. Now, I have heard in the grapevine that Meraki will be bringing SIM supported LTE models this year. This being the case, would solve everything.
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