Do any other resources work ? Yes eyez-on (alarm monitor), and teamviewer (remote desktop)
Both of these have been used successfully for a week. I dont know how they work through the router? Regarding this being currently worked on for opensprinkler, a solution may be in how these 2 resources work.
I have 3 of these 4gLTE routers ? Prior to purchase i inquired about the ability of port forwarding and they pointed out the routers port forwarding setup page. not clear what good port forwarding is if 2way comm is not possible.
Will try a few other things based on you comments, including a visit to Verizon