Introduction
One of the key decisions in any IoT solution is how devices are onboarded securely and efficiently. Azure Device Provisioning Service (DPS) simplifies this process, but it offers two distinct approaches: Individual Enrollment and Enrollment Groups. While both methods ultimately provision devices into Azure IoT Hub, they are designed for different scenarios. Choosing the right approach early can significantly impact how easily your solution scales and how manageable it remains over time. This article breaks down both methods in a practical way and helps you understand where each one fits.
Overview of Provisioning Approaches
Individual Enrollment
Individual enrollment is the most straightforward approach. Each device is registered separately in DPS with its own identity and credentials.
This means every device is handled independently, giving you full control over its configuration and behavior. However, as the number of devices increases, managing each one individually can become time-consuming.
Refer to the link below for the implementation of the Individual Enrollment of devices using DPS Automating Device Onboarding with Azure Device Provisioning Service (DPS) – Individual Enrollment
Enrollment Groups
Enrollment groups provide a scalable alternative by allowing multiple devices to share a common configuration. Instead of registering devices individually, you define a group and allow devices to provision themselves using a shared key or certificate.
Each device still gets its own identity in IoT Hub, but the onboarding process becomes automated and significantly more efficient.
Refer to the link below for the implementation of the Enrollment Groups attestation for devices using DPS Scaling IoT Onboarding with Azure Device Provisioning Service (DPS) – Enrollment Groups
Core Differences Between the Two Approaches
The fundamental difference lies in how provisioning is managed.
Individual enrollment focuses on device-level control, where each device is explicitly configured and managed. This provides flexibility but requires more effort as the number of devices grows.
Enrollment groups focus on scalability and automation, where a single configuration is applied to multiple devices. This reduces operational overhead and enables seamless onboarding at scale.
Use Cases for Individual Enrollment
Individual enrollment is best suited for scenarios where control and customization are important.
Ideal scenarios:
Proof of Concept (POC) or demo environments
Testing and development setups
Devices with unique configurations
High-security use cases requiring strict tracking
Example
In a healthcare system, medical devices often need to be individually identified and audited. Managing each device separately ensures better compliance and traceability.
Use Cases for Enrollment Groups
Enrollment groups are designed for large-scale deployments where automation is critical.
Ideal scenarios:
Manufacturing and bulk device provisioning
Smart city solutions such as energy meters
EV ecosystems and industrial IoT deployments
Devices with standardized configurations
Example
In a smart city deployment, thousands of sensors or meters need to be connected. Enrollment groups allow these devices to automatically provision themselves without manual setup.
Practical Decision Guidance
Choosing the right approach depends on the nature and scale of your deployment.
For smaller environments or scenarios requiring detailed control, individual enrollment is a good fit. For larger deployments where efficiency and automation are priorities, enrollment groups provide a more practical solution.
In many real-world architectures, both approaches are combined—individual enrollment for critical devices and enrollment groups for bulk onboarding.
Conclusion
Selecting the right provisioning strategy plays a key role in the success of an IoT solution. Individual enrollment provides control and flexibility, while enrollment groups enable scalability and automation. Understanding how and when to use each approach helps ensure your solution is both manageable today and ready to grow tomorrow.