Hap 5.1 | Authorization Code

Guide: HAP 5.1 Authorization Code

1. What is HAP 5.1?

HAP (Home Accessory Protocol) is Apple’s proprietary protocol for controlling home automation devices (e.g., lights, thermostats, locks) via the HomeKit ecosystem.
Version 5.1 introduced enhanced security and pairing mechanisms, with the Authorization Code playing a key role in device authentication.

Copy and paste the company name and code directly from the Carrier e-mail. Do not manually type it out. "Code Expired" The trial or subscription period has lapsed. hap 5.1 authorization code

: Users can contact a regional Carrier supplier to purchase a license and receive their customer number and code via email. Official Support Guide: HAP 5

: While the authorization unlocks the program, your actual project data from older versions (4.0 through 5.01) must be manually converted using the "Convert HAP 4.x or 5.x Project" option within the Project Menu. Trial Access : If you do not yet have a license, Carrier offers a 60-day free trial Where to get authoritative details Refer to the

Where to get authoritative details

Refer to the official HAP specification for precise protocol messages, TLV formats, characteristic UUIDs, and version-specific behavior (HAP 5.1) — it defines pairing, pairing-verify, pairings management, and any new authorization code fields or flows introduced in 5.1.

• HAP 1.0 – 2.0 (Initial Release): Relied on a simple 8-digit numeric setup code (often printed on the accessory). Pairing was done via IP (Wi-Fi) or BLE (Bluetooth Low Energy).
• HAP 3.0 – 4.0 (The "Scatter" Era): Introduced MFi chip requirements but still suffered from vulnerabilities in replay attacks during the initial setup handshake.
• HAP 5.0 – 5.1 (The Current Standard): Overhauled the cryptographic handshake. HAP 5.1 mandates the use of Ed25519 for signing and ChaCha20-Poly1305 for encryption. The authorization code is no longer just a PIN; it is a dynamically generated, time-bound token or a high-entropy static code used within a secure SRP (Secure Remote Password) session.