Sending BLE multiple packages

Question

Hello Group, 
 I'm trying to send I2C/twi data from nRF52832 using the Nordic development board with nRF Connect SDK 1.9.1. 
 Based on the sample project ble_app_uart, I was able to send one package of 240 bytes through the BLE mechanism in each connection interval of 40ms. 
 I want to send multiple packages (probably four) in each connection interval. I tried but got errors. (I searched questions and answers in the blog, but I couldn't find the solution) 
 Do you have any idea or example showing the setting for sending multiple packages? 
 Thanks a lot for your time, 
 Jack 
 // =========== 
 static void sensor_meas_timeout_handler(void* p_context) 
{
 if (IsSensorInitReady == false) { return; }
 if (IsUserRequestDataReady == false) { return; }

// prepare data
 uint16_t length = PACKAGE_BLE_MAX_SIZE;
 ret_code_t err_code;

UNUSED_PARAMETER(p_context);
 kx132ReadFifo();

err_code = ble_nus_data_send(&m_nus, BlePackageData, &length, m_conn_handle);
 if ((err_code != NRF_ERROR_INVALID_STATE) &&
 (err_code != NRF_ERROR_RESOURCES) &&
 (err_code != NRF_ERROR_NOT_FOUND))
 {
 APP_ERROR_CHECK(err_code);
 }

// duplicate data testing sending multiple packages
 err_code = ble_nus_data_send(&m_nus, BlePackageData, &length, m_conn_handle);
 if ((err_code != NRF_ERROR_INVALID_STATE) &&
 (err_code != NRF_ERROR_RESOURCES) &&
 (err_code != NRF_ERROR_NOT_FOUND))
 {
 APP_ERROR_CHECK(err_code);
 }
 else
 {
 NRF_LOG_INFO("
 Error Multiple package ++++");
 NRF_LOG_FLUSH();
 }
}