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AWS Lambda middleware — Yealink desk phone DSS key unlocks front door via LenelS2 Elements API
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yealinkT58W-door-unlock.ph.xml Apply display settings to T58W template to match T54W templates 2026-04-27 13:47:49 -04:00

README.md

Sea Haven Door Unlock API

AWS Lambda middleware that allows a Yealink T54W desk phone to unlock the front door controlled by LenelS2 Elements. Press a DSS key on the phone, and the door unlocks.

Yealink T54W → HTTPS GET → API Gateway → Lambda → LenelS2 Elements API → Door Unlocks

Architecture

  • API Gateway (HTTP API) — single GET /unlock endpoint with throttling (5 burst / 2 sustained req/sec)
  • Lambda (Node.js 20.x) — validates a shared auth token, calls the Elements TemporaryUnlock command
  • SSM Parameter Store — stores the Elements API key, auth token, and door device ID
  • Custom Domain — doorunlock.seahaven.com via Route 53 + ACM wildcard cert

SSM Parameters

Parameter Type Description
/seahaven/door-unlock/elements-api-key SecureString LenelS2 Elements API key
/seahaven/door-unlock/auth-token SecureString Shared secret embedded in the Yealink DSS key URL
/seahaven/door-unlock/door-id String Elements device ID for the front door reader

Deployment

npm install
npx cdk deploy

Phone Configuration

Configure a DSS key on the Yealink T54W (via phone web UI or 3CX):

  • Type: URL
  • Label: Unlock Door
  • Value: https://doorunlock.seahaven.com/unlock?token=<auth-token-value>

3CX Provisioning Templates

Custom 3CX templates are included with the door unlock URL hardcoded on line key 2.

Template Model Line Key 2 Keys 3+ Display
yealinkT54W-door-unlock.ph.xml T54W Unlock Door Managed by 3CX BLF Dim after 5 min, never sleep
yealinkT54W-door-unlock-with-sp.ph.xml T54W Unlock Door Shared Parking SP1-3 Dim after 5 min, never sleep
yealinkT58W-door-unlock.ph.xml T58W Unlock Door Managed by 3CX BLF Default T58W display settings