What is the maximum data size that can be sent from base gnss module to Rover module using xbee 868 sx?

XBee & XBee Gateway
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And required data rate for the same base -rover application?

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There is no Maximum payload size that I can send. I can send a 10Mb file if I wanted to as long as I was using hardware flow control. It just will be broken up in 256 byte chunks over the air.