TFTP CS Free

A simple and lightweight TFTP client and server.
The server can be configured to accept requests only from a specific ip address or subnet.
The TFTP server can run side by side with multiple TFTP clients.
All tasks are handled by a background service, so while the transfers are in progress the app can be closed.
By design Android not permit to listen on port less than 1024, so the server cannot listen on the standard port 69.

This is the free version, if you don't want see the ads you can buy the paid version.