i've modified the script: bset &size 1 %packetsize
now with mirc it is:
00000000 17 .
00000001 00 00 00 02 00 00 00 03 61 73 64 61 73 64 61 73 ........ asdasdas
00000011 64 61 73 64 61 00 00 dasda..
and the working must be:
00000000 17 00 00 00 02 00 00 00 03 00 00 00 61 73 64 61 ........ ....asda
00000010 73 64 61 73 64 61 73 64 61 00 00 sdasdasd a..