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BLE uart slow

Hello,

I used ble_app_uart_c and ble_app_uart exemples on 2 tiny ble boards and S130.

Write and notifications are very slow. Does someone have an idea ?

Connection settings :

#define MIN_CONNECTION_INTERVAL    MSEC_TO_UNITS(7.5, UNIT_1_25_MS)   /**< Determines minimum connection interval in millisecond. */
#define MAX_CONNECTION_INTERVAL    MSEC_TO_UNITS(50, UNIT_1_25_MS)    /**< Determines maximum connection interval in millisecond. */
#define SLAVE_LATENCY              10                                  /**< Determines slave latency in counts of connection events. */
#define SUPERVISION_TIMEOUT        MSEC_TO_UNITS(4000, UNIT_10_MS)    /**< Determines supervision time-out in units of 10 millisecond. */
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