How many Kbytes per second we can reach in ble_app_uart?

[Zhang Yubiao]

F:\nRF5_SDK_16.0.0_98a08e2\examples\ble_peripheral\ble_app_uart

I tested above example, found the speed only 3K per second. Do we have a way to increase the speed?

[Håkon]

Hi,

In main.c
Connection interval:
Line 94 and 95 defines the connection interval min/max

DLE:
Line 114 defines the packet size.
BLE_GATT_ATT_MTU_DEFAULT is 23 bytes, but can be changed to NRF_SDH_BLE_GATT_MAX_MTU_SIZE -3 instead. 
This I have not verified, but I will ask my colleagues if this is the correct approach.
However, feel free to test your self in the meantime. 

static uint16_t   m_ble_nus_max_data_len = BLE_GATT_ATT_MTU_DEFAULT - 3;           
/**< Maximum length of data (in bytes) that can be transmitted to the peer by the Nordic UART service module. */

[Zhang Yubiao]

#define MIN_CONN_INTERVAL MSEC_TO_UNITS(20, UNIT_1_25_MS) 
#define MAX_CONN_INTERVAL MSEC_TO_UNITS(20, UNIT_1_25_MS)

Is there a range for MIN_CONN_INTERVAL change? 

[Håkon]

This post discusses some connection parameters: https://devzone.nordicsemi.com/f/nordic-q-a/28058/what-is-connection-parameters

Connection interval must be in range 7.5 - 4000 ms.