Append an 'nsend' command to the script. The 'nsend' command is
used to append additional content to the packet generated by the
'bsend' command when the desired 'bsend' content is more than 255
characters. The set value of this object should be the exact
characters to be appended. The 'nsend ' characters will be
automatically appended. Also a 'null terminator' (\0) will be
automatically appended. The null terminator and the 'nsend '
characters will be counted as characters in the script.