Questions about sending RTL8720DN server messages

[ark2]

I made a wifi server with RTL8720DN and connected it to hercules client to send and receive messages, but I can't send them

It worked well to make it a client, send and receive messages from the server,

It's a problem sending it to the server

I don't know what this is

How can I send it to the seed?

That's what I've been doing

Code

void send_data ( UART_HandleTypeDef *_uart, int32_t _dataSize, uint8_t *_conId, uint8_t *_data)
{
    uint8_t param_buf[ 100 ] = { 0 };
    uint8_t quatation_mark[ 2 ] = { '\"', 0 };
    uint8_t comma[ 2 ] = { ',', 0 };
    uint8_t colon[ 2 ] = { ':', 0 };
    int send_size = 0;
    int len = 0;
    
    sprintf(param_buf, "%d", _dataSize);
    strcat( param_buf, comma );
    strcat( param_buf, _conId );
    strcat( param_buf, colon );
    
    len = strlen(param_buf);
    
    //hex값�?� 전송하기 위해서 memcpy 사용
    memcpy(param_buf+len, _data, _dataSize);
    
    //�?성�?� 버�?� 길�?�
    len = len + _dataSize;
    
    parameter( _uart, bw_ATPT, param_buf, len, 500);
}
 
void parameter ( UART_HandleTypeDef *_uart, uint8_t *at_cmd_buf, uint8_t *param_buf, int send_size, int timer)
{
    
    uint8_t final_cmd[ DRV_TX_BUFFER_SIZE ] = { 0 };
    uint8_t check_char[ 2 ] = { '=', 0 };
    int cmd_len = 0;
    
    strcpy( final_cmd, at_cmd_buf );
    strcat( final_cmd, check_char );
    
    cmd_len = strlen(final_cmd);
    
    // hex값�?� 복사하기 위해 memcpy 사용
    memcpy( final_cmd + cmd_len, param_buf, send_size );
    
    //�?성�?� 버�?� 길�?�
    cmd_len = send_size + cmd_len;
    
    cmd(_uart, final_cmd, cmd_len, timer);
      
}
int cmd ( UART_HandleTypeDef *_uart, uint8_t * _cmd , int _cmdSize, int timer)
{
    uint8_t SENDCR1[2] = {0x0d,0x0a};
 
    HAL_UART_Transmit(_uart, _cmd, _cmdSize, 0xff);
    HAL_UART_Transmit(_uart, SENDCR1, 2, 0xff);
 
    HAL_Delay(timer);
    
    return 0; 
}
 
sliceBuf[3] = {0xFF, 0XFF, 0xFF};
send_data (&huart5, 3, bw16ConID, sliceBuf);

Note Links : https://docs.ai-thinker.com/_media/rtl8710/docs/rtl8720d-at%E6%8C%87%E4%BB%A4%E6%89%8B%E5%86%8Cv2.4.1-20190814.pdf