TftpServer application for Mac

Hi all, I’m trying get a TFTP server up and running on a Mac running macOS Mojave Ver 10.14.2 so I can update the boot code and firmware for my new Cisco SMB switch. However, when I hit the button to “Start TFTP” it does nothing. Since I’m using a Mac I was pointed to this software by:

I have used another open source product for windows clients called Tftpd64 in the past and it worked great. Is there something I’m missing to get the TFTP server running on a Mac? I’ve also included a screenshot to show that both the “working path permissions” and “parent folder permissions” are good.