Using the FTPD client

You have to run ftpd via tcpsvd

Example:

tcpsvd -vE 0.0.0.0 1024 ftpd /

This will start an FTP server on port 1024 from the / directory

Using a port number lower than 1024 on a non-rooted device will result in the following error message:

tcpsvd: bind: Permission denied