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To provision an ESP32-S3 with AWS IoT Core using a certificate signing request (CSR), the device creates a key pair and CSR, requests a certificate over MQTT, then registers the device with a provisioning template before the returned ownership token expires. Keep the private key on the device, subscribe to each request’s accepted and rejected response topics before publishing, and use TLS for cloud communications. The exact CSR-generation API and key-storage setup depend on the firmware’s cryptographic implementation and version; there is no single verified ESP-IDF recipe established here.
Choose how the device will be authorized to begin provisioning
AWS IoT Core documents two bootstrap patterns: provisioning by claim and provisioning by trusted user. This choice determines what the device or installer must trust before it receives its enduring, per-device certificate.
| Bootstrap approach | What starts provisioning | Main trade-off |
|---|---|---|
| Provisioning by claim | A temporary fleet claim credential installed on the device | Enables automated onboarding, but makes protection and scope of the shared bootstrap credential especially important. |
| Provisioning by trusted user | An authorized user initiates a controlled provisioning workflow | Avoids relying on a shared fleet claim in the same way, but depends on user authentication, permissions, and the setup process. |
In either pattern, the intended result is a per-device certificate for later AWS IoT access. Do not confuse the claim workflow’s timing with the CSR ownership-token deadline: AWS documents a separate five-minute window in its claim-based workflow for obtaining a permanent certificate and private key after connecting with the temporary claim credential.
Prepare a fleet provisioning template
Create a fleet provisioning template with parameters for the device’s unique thing name and its CSR string. In the template’s resources, declare the thing, certificate, and IoT policy. For a CSR workflow, configure the certificate resource’s CertificateSigningRequest property to refer to the CSR parameter, and specify the intended certificate status. AWS documents this property and the relevant template resource types.
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- 🔥【Dual Mode & High Performance】 The ESP32-S3 development board features integrated dual-core xtensa 32-bit LX7 microprocessor, clock speed up to 240 MHz, with 16MB Flash and 8 MB PSRAM. Perfect for Arduino IoT projects requiring stable wireless communication with ultra-low power consumption.
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Give each device a unique, stable thing name that firmware can supply as a template parameter. Design the final IoT policy around the device’s actual application needs, rather than granting broad access simply to make provisioning succeed. The policy’s required actions and topics depend on the product’s topic design; they cannot be specified accurately without that design.
Create the CSR on the ESP32-S3 and keep the private key there
- Choose the project’s cryptographic implementation. Use the implementation and key-storage approach selected for the firmware. The available AWS and Espressif information does not establish one universal ESP-IDF CSR-generation API or configuration for every ESP32-S3 project.
- Generate a key pair on the device. Retain the private key under device control. In a CSR workflow, send the PEM-encoded CSR to AWS, not the private key.
- Prepare the provisioning parameters. Include the CSR string and the template parameters, such as the unique thing name, in the provisioning request flow.
- Confirm who will sign the CSR. Without an AWS IoT certificate provider configured, AWS IoT signs the CSR using AWS-managed signing. If the account is configured with a certificate provider, AWS can route the CSR to a customer-managed Lambda-backed signing path, which can use a private CA or other PKI. Confirm the intended signer before relying on a particular issuer.
This keeps the device’s private key out of the certificate-issuance response. That is different from a workflow that generates a key in the cloud and returns it to the device; choose based on the product’s key-custody requirements.
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- ESP32-S3-DevKitC-1-N16R8 SPI voltage: 3.3v, ESP32-S3-DevKitC-1 is an entry-level development board equipped with Wi-Fi + Bluetooth module ESP32-S3
- Most of the I/O pins on the module are broken out to the pin headers on both sides of this board for easy interfacing. Developers can either connect peripherals with jumper wires or mount ESP32-S3-DevKitC on a breadboard.
- The ESP32-S3-DevKitC development board equipped with ESP32-S3-DevKitC-1-N16R8, a general-purpose Wi-Fi + Bluetooth LE MCU module that integrates complete Wi-Fi and Bluetooth LE functions.
- ESP32-S3-N16R8 cable can be used: USB Type A to Type-C cable or CC cable Note the distinction between the commonly used USB A port to Type-C cable that can only be charged, which cannot be used for communication between YD-ESP32-S3 and the host.
- USB-to-UART Port and ESP32-S3 USB Port (either one or both), default power supply (recommended)
Use the MQTT request-response flow in the right order
Fleet provisioning requests use MQTT. For every request, subscribe to its corresponding /accepted and /rejected response topics before publishing the request. Keep the subscriptions and request on the same MQTT connection, and make firmware handle either outcome rather than waiting indefinitely for success.
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1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitches- Connect using the selected bootstrap authorization. The claim or trusted-user approach determines how the device is permitted to start the flow.
- Subscribe to both outcomes for CreateCertificateFromCsr. Do this before publishing the request containing the PEM CSR. AWS’s API returns certificate data and an ownership token when the request succeeds; the certificate is in
PENDING_ACTIVATION. - Handle rejection explicitly. If AWS returns a rejected response, record or report the failure through the project’s diagnostics path and do not proceed to registration as though a certificate were issued.
- Subscribe to both outcomes for RegisterThing. Publish registration with the provisioning template name, template parameters, and ownership token. Wait for the accepted or rejected response and handle each separately.
The ownership token connects certificate creation to registration; preserve it until registration completes. A successful certificate-creation response alone does not complete provisioning.
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- 【Diverse connectivity options】: The ESP32-S3-1 supports dual-mode Wi-Fi and Bluetooth 5.0 (LE) connectivity for a wide range of smart devices, making it ideal for Internet of Things (IoT) applications.
Register the device before the ownership token expires
AWS documents a one-hour lifetime for the ownership token returned by the MQTT API. RegisterThing must complete within that period. AWS says the pending certificate is deleted if it has not been activated and attached to a thing or policy before the token expires.
Treat this as a workflow deadline: after a successful CSR request, proceed to RegisterThing promptly and keep retries bounded by the remaining token lifetime. If the token has expired, restart certificate creation and then register with the new ownership token; do not assume the old pending certificate or token remains usable.
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- 【PRE-SOLDERED, PLUG-IN DESIGN】ESP32-S3 boards come with pre-soldered headers and plug directly into the included expansion and terminal boards — no soldering required.
- 【MULTI-PLATFORM COMPATIBILITY】Works with C++, MicroPython, ESP-IDF, Raspberry Pi, and STM32 — with online tutorials for quick start. Power via USB-C (5V) or VIN pin (5–12V); do not exceed 5V on the USB-C ports.
Protect the bootstrap path, transport, and final credentials
- Use TLS for cloud communication. ESP-IDF recommends TLS for communications with cloud services.
- Limit bootstrap permissions. Scope the bootstrap authorization to the provisioning operations and resources the device actually needs.
- Limit the resulting device policy. Grant only the application actions and topic access required by that device.
- Protect the claim credential if using claim provisioning. A shared bootstrap credential has broader onboarding significance than a per-device credential, so its handling and authorization scope deserve particular care.
- Keep key custody explicit. With the CSR approach, the device retains its private key while AWS or the configured customer-managed signer issues a certificate for the corresponding public key.
AWS’s general template and provisioning behavior do not define a complete least-privilege policy for a particular product. Derive the exact bootstrap and device policies from the firmware’s MQTT topics, required actions, and deployment design.
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Espressif’s esp-aws-iot repository lists ESP32-S3 as a supported platform and includes a fleet_provisioning_with_csr example. The repository notes that this example depends on corePKCS11 and is incompatible with a named release branch. Repository support is not proof that a particular board, ESP-IDF release, or example has been built and tested.
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- 【FLEXIBLE PROTOTYPING PINS】2x40-pin GPIO headers compatible with breadboards and sensors. Supports external ToF sensors via I2C for distance sensing.
Before documenting or reproducing a build, record the exact ESP-IDF version, esp-aws-iot revision, and component or submodule revisions used. Check the example’s branch compatibility and its corePKCS11 dependency against those pinned revisions. Do not copy build commands from a different release and assume they apply unchanged.
Quick Recap
Validate the implementation before deployment
- Confirm that the CSR contains the public key corresponding to the private key retained by the device.
- Verify that firmware subscribes to accepted and rejected responses before each corresponding request publication.
- Test the full successful sequence through RegisterThing, not only certificate creation.
- Exercise rejected responses and token-expiry recovery; expired-token recovery should begin with a new certificate-creation request.
- Confirm the created thing, certificate status, and attached policy match the template’s intended resources.
- Check that the bootstrap and final device permissions are limited to the intended provisioning and application operations.
- Build and test with the exact board, ESP-IDF version, SDK revision, and dependencies selected for the product; general repository support alone does not establish board-specific validation.
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