Here are the steps I used to setup a new Let’s Encrypt certificate for nginx running on a Debian EC2 instance.

While quietly rolling out the public beta of Adafruit IO, we noticed some CPU spikes in our Node.js processes that handle MQTT. We currently use a slightly modified version of Mosca by @mcollina as our MQTT broker. It is a very solid package, but we seemed to be pushing the limits of Mosca’s Redis persistence module.