Seems like you will have to code it yourself :) Everybody here seems to be quite bizzy with his own projects... But you should find quite easily sourcecode on the web for a basic ftp client in C and adapt it to Bmx.
Searching for a Blitz coded client
BlitzMax Forums/BlitzMax Programming/Searching for a Blitz coded clientThe forum is locked. These are the original blitzbasic.com forums, kept so they can still be read. No new topics, replies or edits can be made here. To join in, head over to the Blitz3D+ forums.