Pile 0007: TLV格式

TLV: Type-length-value

T、L字段的长度往往固定（通常为1～4bytes），V字段长度可变。顾名思义，T字段表示报文类型，L字段表示报文长度、V字段往往用来存放报文的内容。

 

Demo 0001

uint8 sensor_TxBuff[SENSOR_TX_BUFF_LEN] = {0};

int CreateFrame_TempeHumi(sint16 tempe, uint8 humidity)
{
    uint8 len = 0;

    Clear_TxBuff();

    sensor_TxBuff[len++] = FRAME_TYPE_TEMPEHUMI;                                /* TLV type                                                  */

    sensor_TxBuff[len++] = 0x03;                                                /* TLV length                                                */

    /* Temperiture */
    sensor_TxBuff[len++] = (uint8)((tempe >> 8) & 0xFF);                        /* TLV value                                                 */
    sensor_TxBuff[len++] = (uint8)(tempe & 0xFF);

    /* Humidity */
    sensor_TxBuff[len++] = (uint8)(humidity & 0xFF);

    return len;
}

 

Reference

http://blog.csdn.net/chexlong/article/details/6974201/