* [TD-3968]<fix>: taosdemo datalen should be 16*1024

fix data buffer issue.

* [TD-3968]<fix>: taosdemo datalen should be 16*1024

commend out unused func for debugging purpose in the future

* [TD-3968]<fix>: taosdemo datalen should be 16*1024

comment off unused function

* [TD-3968]<fix>: taosdemo datalen more than 16k.

comment off unused array.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>