trying to send bytes from peripheral to central (DA14580 to smartphone)

I am trying to send a n array of bytes from the BLE chip to the smartphone, AFTER I receive an array of bytes in the BLE chip from the smartphone, that is, my intended order of operation is as follows:

Smartphone --BLE--> DA14580 chip --BLE--> smartphone

我已经设法做了第一部分（智能手机 - > DA14580芯片），但我无法理解如何做第二部分

I am modifying the ble_app_peripheral sample program

I took the code inside void app_adcval1_timer_cb_handler() in user_custs1_impl.c, and tried to modify it, but it doesn't work (that is, my bustom BLE receive app on my smartphone does not detect anything)
（我也确定它不是智能手机应用程序的问题，因为它可以从我拥有的另一个自定义BLE模块中检测到传入的BLE数据，以及我的目标创建我自己的此自定义模块的版本）

Here is my code:

void user_server_rx_data_ind_handler(ke_msg_id_t const msgid,
struct custs1_val_write_ind const *param,
ke_task_id_t const dest_id,
ke_task_id_t const src_id)
{
arch_printf("in function %s\n\r", __func__ );
//执行操作：只需显示数据即可
for(int i=0; ilength; i++){
arch_printf("\tparam->value[%d] = %d (0x%x)\n\r", i, param->value[i], param->value[i] );
}

//2018-02-12: I2C send byte to external dev
//send the data part of the received byte array to I2C slave address
ARCH_PRINTF（“写入I2C：添加：％D值：％d \ n \ r”，i2c_slave_address，param->值[（param-> length） - 1]）;
i2c_write_mine(I2C_SLAVE_ADDRESS, param->value[(param->length) - 1]);

//2018-02-20: from forum post (https://support.dialog-semicondiondiond.com/ble-transmission.)
//*************************************Custom value 1*********************************//
struct musts1_val_ntf_req * req = ke_msg_alloc_dyn（custs1_val_ntf_req，
TASK_CUSTS1,
TASK_APP,
custs1_val_ntf_req，
DEF_USER_SERVER_TX_DATA_CHAR_LEN);

ARCH_PRINTF（“INSION％S \ n \ r \ tcusts1_val_ntf_req =％d \ n \ r \ ttask_custs1 =％d \ n \ r \ ttask_app =％d \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ r \ tdef_cust1_adc_val_1_char_len =％d \ n \ r”，__ func__custs1_val_ntf_req，task_custs1，task_app，def_user_server_tx_data_char_len）;
static uint16_t sample[20];
for（int i = 0; i <20; i ++）
{
sample[i] = 65 + i;
}

req-> conhdl = app_env-> conhdl;
//req->handle = CUST1_IDX_ADC_VAL_1_VAL; // 2018-02-20 : ORIG
req-> handle = user_idx_server_tx_data_val;
// req-> length = def_cust1_adc_val_1_char_len;// 2018-02-20：orig
req-> length = def_user_server_tx_data_char_len;
// memcpy（req->值，＆sample，def_cust1_adc_val_1_char_len）;// 2018-02-20：orig
memcpy(req->value, &sample, DEF_USER_SERVER_TX_DATA_CHAR_LEN);

KE_MSG_SEND（REQ）;

ARCH_PRINTF（“I2C数据发送完成\ n \ r”）;
}

user_server_rx_data_ind_handler() is the custom function that gets called when DA14580 receives bytes from BLE (this function is called inside user_catch_rest_hndl() in user_peripheral.c, inside one of the switch()...case blocks

user_idx_server_tx_data_val在user_custs1_def.h中定义，沿着side cust1_idx_adc_val_1_val in枚举。此枚举条目是在BLE_PERITELAL_APP的教程中创建的。与此同时创建的其他枚举是：

USER_IDX_SERVER_TX_DATA_CHAR,
user_idx_server_tx_data_val，
USER_IDX_SERVER_TX_DATA_NTF_CFG,
USER_IDX_SERVER_TX_DATA_USER_DESC,
基本上，我试图使其与cust1_idx_adc_val_1_ *相同

def_user_server_tx_data_char_len在user_custs1_def.h中定义为
#define DEF_USER_SERVER_TX_DATA_CHAR_LEN 20

BLE_PERITALAL_APP教程我遵循是
training_03_custom_profile_gatt_cmd_example_v1 0.pdf.

我想我在这里缺少非常基本的东西。如何从BLE芯片向智能手机发送单个数据字节？

--- EDIT ---
这会导致UART终端上的以下输出：

Inside user_server_rx_data_ind_handler
custs1_val_ntf_req = 55300.
task_custs1 = 54
TASK_APP = 50
DEF_CUST1_ADC_VAL_1_CHAR_LEN = 20
I2C data sending completed

It also causes a call to the user_catch_rest_hndl () function in user_peripheral.c

输入user_catch_rest_hndl：
msgd = 0xD805.
CUSTS1_VAL_NTF_CFM detected : msg_param->handle = 27

---编辑2 ---
The following entries were also added to the user_custs1_def.c file's struct attm_desc_128 custs1_att_db[CUST1_IDX_NB] = structure definition:

//user Server TX data Characteristic Declaration
[user_idx_server_tx_data_char] = {（uint8_t *）和att_decl_char，att_uuid_16_len，perm（rd，启用），
sizeof（user_server_tx_data_char），sizeof（user_server_tx_data_char），（uint8_t *）和user_server_tx_data_char}，

//user Server TX data Characteristic Value
//might have to enable NTF permission here; come back to this point if needed later
[user_idx_server_tx_data_val] = {user_server_tx_data_uuuid_128，att_uuid_128_len，perm（rd，启用）|perm（ntf，启用），
def_user_server_tx_data_char_len，0，null}，

//用户服务器TX数据特征配置描述符
[user_idx_server_tx_data_ntf_cfg] = {（uint8_t *）和att_decl_cfg，att_uuid_16_len，perm（rd，启用）|perm（wr，启用），
sizeof（uint16_t），0，null}，

//user Server TX data Characteristic User Description
[user_idx_server_tx_data_user_desc] = {（uint8_t *）＆att_decl_user_desc，att_uuid_16_len，perm（rd，启用），
sizeof（user_server_tx_data_user_desc） - 1，sizeof（user_server_tx_data_user_desc） - 1，user_server_tx_data_user_desc}，