Let’s Encrypt Support for Android 7 Has Ended

Google Cloud Nightscout » Let’s Encrypt and Android 7

Our setup uses Let’s Encrypt. Unfortunately, free support for Android 7 has ended, as described here. If you attempt to access the site with Android 7 or older, it will fail. Any other device will work fine.

This is an error you may see on your uploader:
javax.net.ssl.SSLHandshakeException: Java.security.cert.CertPathValidatorException: Trust anchor for certification path not found.

In case of a follower or browser, you may see ... can't open the page.

You will need to use a device running Android 8 or newer to access your site.