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From External network(WAN) try to access ftp server of client machine(LAN client) using router uplink ip address(Goto terminal enter ftp -p 192.168.2.30 in WAN client),
while client machine(LAN)run https service(In browser https://www.google.com)

For UDP : Router configure Trigger port 443:443 and Target port 2399:2399.

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In Your client machine(LAN)you have to run : nc -u -l 2399 
From external WAN machine run nc -u 192.168.2.30 2399, while client machine(LAN)run https service(In browser https://www.google.com)

Supported devices

RaspberryPi 

Sanity Testing
 

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References

EPIC/User Stories

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