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The nRF5_SDK_14.2.0 of nRF52832 receive large data from android phone

Hi 

When I use the nRF5_SDK_14.2.0 of nRF52832, the example is selected ble_app_uart.  And the Android example is the Android_UART_Client_Bluethoot_Sensor_Nordic_CortexM4_NRF52832, but now the problem is that the nrf52832 device could finish receiving 5KB data from android phone after 7 seconds.  But according nordic test report the data rate cannot so slow. So could you give me some advice. Thanks.