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Data transfer rate by serialization

Hi,

I have two CPU in our product. (STM32F2 and Nordic nrf51422).

I use serialization function to link those two CPU(refer to ble_s110_serialization sample) But I find a question that the data transfer rate is too slowly(send data from my davice to phone) I send 25K bytes to phone that need 50s and 1K/2s.

Do you have any test result for data transfer rate by serialization function?

Thank you