Does a xmit response indicate local packet send or remote ack?
Is there any way to affect TCP window size/buffering to avoid dropping incoming packets due to a slow, low-RAM host processor?
How much buffering can XBee do internally if serial port is paused with flow control? (However even this doesn't help on multiple simultaneous TCP connections).
Is incoming data ack'd immediately or does it wait until the packet is delivered out the serial port?