Why is this erlang tftpd server seemingly not accepting client requests?

Question

I'm attempting to use inet's tftp, but I'm doing something incorrectly. This simple example application, while it does bind to the correct port, never returns data to a client.

To reproduce, open a terminal in the project root and:

make && ./bin/console

This should boot the tftp_hellp application, and drop you into an erlang shell. Confirm that inets is running:

1> application:which_applications().
[{inets,"INETS  CXC 138 49","5.9"},
 {sasl,"SASL  CXC 138 11","2.2.1"},
 {stdlib,"ERTS  CXC 138 10","1.18.1"},
 {kernel,"ERTS  CXC 138 10","2.15.1"}]

and that the tftp daemon is running:

2> inets:services().
[{tftpd,<0.56.0>},{httpc,<0.50.0>}]

Great. Now, if you look in etc/inets.config you'll notice we're binding tftpd to 6969. Open another terminal and:

> tftp localhost 6969
tftp> get hello.txt
Transfer timed out.

Bother. If my understanding of tftpd were correct--which clearly it's not--we'd get <<"hello world">> back.

What am I doing wrong?

Answer 1

I initially received the same error, but then checked my firewall settings to allow udp/6969 and got the file:

-> % tftp localhost 6969

tftp> get hello.txt

Received 11 bytes in 0.0 seconds

tftp> quit

-> % cat hello.txt

hello world%