📡 IoT · Sequence
Firmware OTA Update Sequence
How a device fleet gets a firmware update safely: staged rollout, signed images, verification, reboot and automatic rollback.
Drawing diagram…
What this diagram shows
- Updates go to a small percentage of devices first
- Devices verify the image signature before installing
- A failed boot rolls back to the previous firmware
Prompt used
Firmware over-the-air sequence: the engineer uploads a signed firmware image and creates a campaign for 5% of devices, the OTA service notifies each device in the batch, the device downloads the image over HTTPS, verifies the signature and checksum, writes it to the inactive partition, reboots, runs a health check and reports success; on failure it boots the previous partition and reports rollback. If the batch success rate is above 98%, the campaign expands to all devices.
Mermaid code
sequenceDiagram
actor E as Engineer
participant OTA as OTA Service
participant D as Device
E->>OTA: Upload signed firmware v2.4
E->>OTA: Campaign: 5% of fleet
OTA->>D: Update available
D->>OTA: Download image (HTTPS)
D->>D: Verify signature and checksum
D->>D: Write to inactive partition
D->>D: Reboot into v2.4
alt Health check passes
D->>OTA: Success
else Health check fails
D->>D: Boot previous firmware
D->>OTA: Rolled back
end
OTA->>OTA: 99% success in batch
OTA-->>E: Expand to 100%Related templates
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