HotButton

During our hackathon we gave Elixir Nerves a try. We created a Nerves Livebook to handle switch events by posting a message to a slack channel (see notebook.livemd).

After we had a working Livebook solution we created our own Nerves firmware image and implemented a GenServer.

Targets

Nerves applications produce images for hardware targets based on the MIX_TARGET environment variable. If MIX_TARGET is unset, mix builds an image that runs on the host (e.g., your laptop). This is useful for executing logic tests, running utilities, and debugging. Other targets are represented by a short name like rpi3 that maps to a Nerves system image for that platform. All of this logic is in the generated mix.exs and may be customized. For more information about targets see:

https://hexdocs.pm/nerves/targets.html#content

Getting Started

To start your Nerves app:

• set the following environment variables like MIX_TARGET by exporting it via export MIX_TARGET=my_target or prefix every command with MIX_TARGET=my_target. For example, MIX_TARGET=rpi3:
  • MIX_TARGET
  • WLAN_SSID
  • WLAN_PASSWORD
  • SLACK_WEBHOOK_URL
• Install dependencies with mix deps.get
• Create firmware with mix firmware
• Burn to an SD card with mix firmware.burn

Docker (Wip)

We created a basic Docker setup so that not everyone has to install the dependencies on the host system (see Dockerfile). The setup is not tested sufficiently and is still work progress. It especially will not work on Apple Silicone because of a missing fwup build.