easy:SetOpt_TFTP_No_Options(onoff)
onoff
to 1 to exclude all TFTP options defined in RFC2347, RFC2348
and RFC2349 from read and write requests (RRQs/WRQs).
This option improves interop with some legacy servers that do not acknowledge
or properly implement TFTP options. When this option is used
#CURLOPT_TFTP_BLKSIZE
is ignored.