Adding Let's Encrypt TLS certificate to UniFi

TL;DR

This snippet installs Let’s Encrypt TLS certificate, ensures it is renewed, and makes sure that UniFi is resolved to LAN IP when accessed via FQDN in TLS certificate.

Environment

• UniFi OS 4.4.6
• UniFi Network 10.0.162
• kchristensen/udm-le commit 316a8509063ce5161436c49a844da18de2681d27

Configuration

• Follow installation instructions in udm-le Readme
• Add A DNS record pointing to UniFi device LAN IP in Policy Engine