AFAIK there is no built-in AT send/expect engine, but lwIP does support PPP over serial interfaces. As long as you manage to setup your whatever in PPP mode, it will work. You can have as many interfaces as your memory and drivers can handle, but don't expect lwIP to route between them (not without you grabbing some hooks). It will however, in expected scenarios, return responses on the expected interface. Otherwise, you bridge or you route.
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