Herramienta de Calibración de Tiempo QR (UTC)

The UTC time-calibration QR tool targets devices that sync their clock to UTC: the device scans the QR code, parses the signed UTC time it carries, verifies the signature, then updates its local clock.

Step 1: Generate

1. Open the tool (Technical Docs → Online Tools → UTC Time Calibration QR Tool);

2. Enter the signing password agreed with the device side (the default matches the factory convention — change it and sync to devices as needed);

3. Scan the QR code with the device; after signature verification, the device calibrates its clock to the encoded time;

4. The QR code refreshes every second, so the time is always the UTC time at the moment of generation.

Payload Format

The payload consists of a protocol header + UTC system time + HMAC-MD5 signature:

___VBAR_CONFIG_V1.1.0___{systemtime='YYYY-MM-DD HH:mm:ss'}--<Base64(HMAC-MD5)>

The time field is built from UTC getters (getUTC*), exactly matching the string format of the local-time tool.

Security Notes

The key participates in HMAC-MD5 signing and the device verifies with the same key; everything runs locally in your browser and no data is uploaded.