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ERROR 17 [NRF_ERROR_BUSY] When scan two services.

SDK15, example ble_app_uart_c

static void db_disc_handler(ble_db_discovery_evt_t * p_evt)
{
    ble_nus_c_on_db_disc_evt(&m_ble_nus_c, p_evt);
    ble_ser_c_on_db_disc_evt(&m_ble_ser_c, p_evt);
}

When scan two services.

ble_db_discovery_start return NRF_ERROR_BUSY.

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