Hello Rick,
Its been awhile, Carl Osborne here. I had two former clients who published their ED wait times to billboards and to their website, this thread is for FHIR API developers, I am not sure if Huntsville is looking to publish this onto a native app, if so, then i don't think there is a FHIR API that will accomplish this, however there is an option to publish on a mobile app without FHIR APIs:
OPTION 1:
This client published the wait times publicly on websites, billboards, and mobile apps but they also provided a dashboard that put their providers in the ED with several different metrics to allow them to assess what is going on and react to real-time data. They presented this at the GLRUG. You can find the ED Wait Times Dashboard presentation here...
https://connect.ucern.com/docs/DOC-272335 Near the end of it they show what metrics we are pulling and also the technical layout of the servers for both internal and external use.
I was able to assist them based on information that I obtained from Ucern post regarding Posting ER Wait times online which can be found here.
https://connect.ucern.com/thread/186852
OPTION 2:
Let me know if you have any questions, or if you want to connect with them. Good to see your email, tell Carol I said hello.
Thanks,
Carl.