Introduction (WIP)

An attempt to create a remote weather station hub on the Raspberry Pi.

The repository consists on several modules written in C# and an Android application written in Java.

Communication between the Raspberry and the Android application is done via gRPC.

The project is still undergoing development and it's not production ready.

Architecture

TBD

Installing and Developing

Requirements

To build this project you will need to install .Net Core 3.1 and Android Studio.

• https://docs.microsoft.com/en-us/dotnet/core/install/
• https://developer.android.com/studio

To run this project on the Raspberry Pi you will need dotnet core 3.1. installed.

Building

The following script provides instructions on how to build the whole project and deploy the NucuCar.Sensors module on the Raspberry Pi.

Manual

// Build project
dotnet build --runtime linux-arm -p:PublishSingleFile=true --configuration Release

// Navigate to desired project directory, for example NucuCar.Sensors.
cd NucuCar.Sensors

// Create .tar
tar -zcvf nh.tar.gz .\bin\Release\netcoreapp3.1\linux-arm\*

// Copy onto pi (replace with your ip, user)
sftp pi@192.168.0.100
sftp> put nh.tar.gz
sftp> exit

// SSH into pi
ssh pi@192.168.0.100

// Extract the archive and cd into it
tar -zxvf nh.tar.gz
cd bin/Release/netcoreapp3.1/linux-arm/

// Grant execution permissions
chmod +x NucuCar.Sensors

// Run the program
./NucuCar.Sensors

To make it easier for you to run the project, you may define a SystemD service for it:

1. Create the SystemD service file with the following command:

sudo nano /etc/systemd/system/nucucar_sensors.service

2. Paste the following contents and make sure to update the WorkingDirectory and ExecStarts paths:

[Unit]
Description=NucuCar.Sensors SystemD Service.
After=network.target

[Service]
User=pi
Group=pi
WorkingDirectory=/home/pi/NucuCar/bin/Release/netcoreapp3.1/linux-arm
ExecStart=/home/pi/NucuCar/bin/Release/netcoreapp3.1/linux-arm/NucuCar.Sensors


[Install]
WantedBy=multi-user.target

3. SystemD commands

sudo systemctl start nucucar_sensors
sudo systemctl stop nucucar_sensors
sudo systemctl restart nucucar_sensors
sudo systemctl status nucucar_sensors

Enable starts the service after the pi has booted, disable undoes what enable does.

sudo systemctl enable nucucar_sensors
sudo systemctl disable nucucar_sensors

To browse the logs for the session and all logs of the service:

journalctl -e -u nucucar_sensors.service
journalctl -u nucucar_sensors.service

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Directory Structure Overview

NucuHub.Android

Holds the Android application.

We are currently targeting Android API 29+.

NucuCar.Domain

Holds common classes and interfaces that are required by the projects, provides all the types that are generated via protocol buffers and some utility classes.

NucuCar.Telemetry

Holds concrete implementation for telemetry publishers and workers. The Telemetry project can be used by other projects such as NucuCar.Sensors to send telemetry into the cloud.

This project is not deployed.

NucuCar.Sensors

Manages all the sensors. For more info see the readme file located in the project directory.

This module is runnable and is deployed on the Raspberry Pi.

NucuCar.TestClient

Command line utility to play around with the car functionality. You can use it to remotely read data from the sensors via gRPC methods and to publish and read telemetry data.

Docs

Holds project resources and documentation.