Ruuvitag Prometheus Exporter

So I wanted my ruuvitags in Grafana for monitoring, and since I did not find a proper version of it, I thought I'd build one myself.

This is my ruuvitag exporter, it uses:

• blteplug for the BLE stack. This means it needs a C compiler and headers to build. I might fix that.

• ruuvi-sensor-protocol-rs To decode the ruuvitag data

• rust-prometheus for the prometheus parts.

• hyper for the simple http1.1 server

• tokio For the async runtime

• tracing for the logging and tracing (Because I wanted to experiment)

It's made to run in a container, so it always listens on 0.0.0.0:9185 I'm open to making that a command line argument, but I didn't want to bother

License: Since it's a network service, I licensed it under Affero GPLv3. In short, it means that if you fork it, modify it, and use it, you still need to share your changes with the users. Not a very difficult requirement.

cross compiling for armv7

I documented this in the past over at work

The steps there are still relevant, I had to look them up to cross compile this.

Cross compiling for aarch64

The process is the same as armv7, but the packages and targets are different:

Use podman to run the official rust container:

podman run --rm -ti -v $(pwd):/code:rw,z --workdir /code docker.io/library/rust:latest

Inside, add the target, and necessary debian packages to cross compile

rustup target add aarch64-unknown-linux-gnu
dpkg --add-architecture arm64
apt update
apt install gcc-aarch64-linux-gnu binutils-aarch64-linux-gnu  libdbus-1-dev:arm64 libc6-dev-arm64-cross

Export the environment variables to make it useful:

export PKG_CONFIG_PATH=/usr/lib/aarch64-linux-gnu/pkgconfig/ 
export PKG_CONFIG_ALLOW_CROSS="true"

Then build:

cargo build --target aarch64-unknown-linux-gnu --release