Thank you very much for posting your code. I'm attempting to use it to Push notices for my Garage Door sensor. I say attempting, because I haven't been successful yet.
I'm using NodeMCU 0.9.5 build 20150212 and your unmodified code. Unmodified except for the po_token and po_user strings. Admittedly I'm new to Lua. The lack of diagnostic response makes debugging very difficult.
Any guidance would be very much appreciated!! I'd love to prove I can push messages before my trial period runs out.
Thanks,
ClosetSparky