ESA OPS-SAT Rust experiment
========

This is the primary repository for the ESA OPS-SAT experiment.
The primary repository to generate packages for ESOC can be found [here](https://egit.irs.uni-stuttgart.de/rust/ops-sat-experiment).
You can also find some more general documentation about OPS-SAT there.

## Pre-Requisites

- Containerization provider like [docker](https://www.docker.com/) or
  [podman](https://podman.io/) installed
- [`cross`](https://github.com/cross-rs/cross) package installed

## Build for Target Hardware

You might need to set the [`CROSS_CONTAINER_ENGINE`](https://github.com/cross-rs/cross/wiki/FAQ#explicitly-choose-the-container-engine)
and [`CROSS_ROOTLESS_CONTAINER_ENGINE`](https://github.com/cross-rs/cross/blob/main/docs/environment_variables.md#configuring-cross-with-environment-variables)
variables manually before calling cross.

### Debug Build

```sh
cross build
```

### Release Build

```sh
cross build --release
```

## Build for Host

The software was designed to be runnable and testable on a host computer.
You can use the regular cargo workflow for this.

### Running

```sh
cargo run --features host
```

### Testing

```sh
cargo test
```

## Commanding Infrastructure

Commanding of the `ops-sat-rs` application is possible by different means.

<img src="docs/networking-structure.png" alt="Networking and Commanding Structure" width="500"/>

### Using the `pyclient` and `pyserver` applications

You can find both commanding application inside the `pytmtc` folder.
It is recommended to set up a virtual environment first, for example by running the following
code inside the `pytmtc` folder:

```sh
python3 -m venv venv
source venv/bin/activate
```

After that, you can install all requirements for both the client and server application
interactively using

```sh
pip install -e .
```

If you want to command the satellite using the OPS-SAT infrastrucute, start the `pyserver.py`
as a background application first, for example by simply running `pyserver.py` inside a
new terminal window.

After that, you can run `pyclient.py -p /test/ping -l` to send a ping telecommand and then
go into listener mode using the following `tmtc_conf.json` file:

```json
{
    "com_if": "tcp",
    "tcpip_tcp_ip_addr": "127.0.0.1",
    "tcpip_tcp_port": 4097
}
```

You can command the TCP server in the OPS-SAT software directly by running the commands with
the following configuration:

```json
{
    "com_if": "tcp",
    "tcpip_tcp_ip_addr": "127.0.0.1",
    "tcpip_tcp_port": 7031
}
```

You can run `pyclient.py -T` or `pyclient.py -h` for more information on the client application.

## Knowledge Base

### Home Path Handling

The OPS-SAT software filesystem handling will determine a home path at the start of the software.
This home path is used for various mechanisms inside the OPS-SAT infrastructure.

Currently, there are 3 possible configurations:

1. If the software is built with the `host` feature, the HOME path will be the current path the
   software is run at.
2. If the `host` feature is not set and the `/home/exp278` folder exists, that folder will be
   the home directory.
3. Otherwise, the default OS home directory will be the home directory.

### Application Shutdown Handling

The application can be stopped by creating a `stop-experiment` file either in the home path
specified in the previous section, or inside the temporary folder. There is also an action command
available to stop the application.

### Camera Handling

TODO