IBB File Transfer

I know that IBB is fallback when SOCK5 is not available, I have tested in a network that the client cannot get and send the proxy server (maybe security restricion from the proxy server to send bytestram )

I want to directly use IBB as connection protocol to send file, how can I specific to use it rather the default SOCK5

Thanks a lot

Looks like you can set FileTransferNegotiator.IBB_ONLY to true, though the docs say it’'s not recommended