- The number of devices that can be connected to a single IoT Hub resource in Azure varies based on the pricing tier:
- Free tier: Up to 500 devices
- Basic tier: Varies based on units, can go up to millions of devices
- Standard tier: Varies based on units, can go up to millions of devices
- The cost for connecting 250 devices for a year would depend on the tier of IoT Hub. Please refer to this table
- For Azure IoT Central, the number of sensors that can be connected to a single device is not strictly limited by the platform itself but rather by the capabilities of the device IoT Central supports 1,000,000 devices per application.