扫描热点时CMD53发送的数据结构：

[12-byte sdpcm_header_t] (filled) 0x24015d2c
[16-byte cdc_header_t] (filled)
[6-byte name with \0] (filled)
[72-byte scan_params] (filled)
[4-byte] 随机数据
共12+16+6+72+4=110字节。

pbuf=0x24015d14
pbuf->tot_len=114
pbuf->len=114
pbuf->payload=0x24015d24

pbuf payload structure:
[4-byte ((whd_buffer_header_t)buffer_header).queue_next] (filled) 0x24015d24
[4-byte ((whd_buffer_header_t)buffer_header).bus_header] (not filled) 0x24015d28
[12-byte sdpcm_header_t] (filled) 0x24015d2c
[16-byte cdc_header_t] (filled)
[6-byte name with \0] (filled)
[72-byte scan_params] (filled)
4+4+12+16+6+72=114

CMD53发送的是pbuf->payload[8-113]和后续的[114-117]随机数据。