Udp hole punching (rendezvous) is supported on a lot of nat routers, but there are still cases it doesn't work.
While SC with a repeater does the job.
Modified uvnc2me so it also does the repeater stuff.
1) He try to use udp hole punching
2) when 1) fail uvnc2me try to use a repeater on the same host as the access server. ( 5901/5500)
Later on this need to be become a parameter but current it's hard coded for testing.
When possible we use method 1) because data doesn't need to be routed and we don't load the access/repeater servers.
Only when method 1) fail we switch to tcp and use the standard uvnc repeater in mode II to connect server/viewer.
Test servers
We have 2 connect servers and 2 repeaters running on support1.uvnc.com and support2.uvnc.com.
Test uvnc2me ( v103)
http://www.uvnc.eu/download/uvnc2me/uvnc2me_103.zip