Sorry for the stupid subject line. At least it's a little better than "Pleez send codes".
The plan is to put a tablet at the exit from a medical clinic to take a quick survey on how we did. (One question I hope) The survey tool is an existing internally developed web app. There is going to be a windows app running on the tablet to take a picture of the person taking the survey*. Basically, I need to trigger the camera on the tablet from the web server.
I can modify the survey application to send a message when a survey starts or ends. Those events already exist. I'm developing the Windows app myself so I get to pick.
For a proof of concept, and maybe even production, I can use IoT Hub on Azure. I'd like to use another MQTT server but I haven't been able to find one that is approved for our network. (Think enormous bureaucracy)
Our environment is Windows and .NET but I can get other servers stood up. (If I'm willing to take the pain)