This guide outlines a way for clients like web pages or mobile apps to receive updates from devices in real time. Cloud apps no longer submit HTTP requests for up-to-date information. Instead, Azure SignalR Service pushes content to clients as soon as it's available. As a managed service, Azure SignalR Service simplifies the process of adding real-time communication to apps.
https://learn.microsoft.com/en-us/azure/architecture/example-scenario/iot/real-time-iot-updates-cloud-apps
