HI2115软件开发板V150版本AT+NSOST指令

1. 在HI2115里面，由于内存空间比较大，所以支持UDP发送指令AT+NSOST的分包

ret = sendto(socket, seq_num, data_string, length, msg_flags, (struct sockaddr *) &sock_address, sizeof(sock_address));

其中上面第2个参数，是分包的序号，从1-255

2. AT指令部分，看下面说的是6个参数可选，但是实际看代码发现，第6个参数不写的话，会报错

AT+NSOST=<socket>,<remote_addr>,<remote_port>,<length>,data>[,<sequence>]

AT+NSOST=,192.158.5.1,,,AB30,
,
O

AT指令的参数，第6个参数sequence就是函数里面的seq_num

<socket> Socket number returned by +NSOCR
<remote addr> IP address
<remote port> A number in the range -. This is the remote port that messages will be received on
<length> Decimal length of data to be sent.
<data> Data to be transmitted in hexstring format, or quoted string format.
<sequence> Sequence of data, range -.If omit, will not report data sent status.
<status> The status of datagram.
 Error
 Sent

3. 第6个参数不写的话，会报错

    cause = at_get_uint8_param(AT_PARSE_SIXTH_PARAM_POS + num_of_flags, &seq_num, true);
    if (cause == AT_RET_PARAM_MISSING)
    {
        seq_num = NEUL_DATA_SENT_DATA_SEQ_INVALID;
    }
    else if ((cause != AT_RET_OK) || (seq_num == NEUL_DATA_SENT_DATA_SEQ_INVALID))
    {
        return AT_RET_SYNTAX_ERROR;
    }