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https://github.com/anjadj/inter-process-communication-in-an-industrial-iot-gateway-device

gRPC & D-Bus
https://github.com/anjadj/inter-process-communication-in-an-industrial-iot-gateway-device

c cpp dbus driver grpc linux python

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gRPC & D-Bus

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README 

        
# 🔸 gRPC

## Build and locally install gRPC and Protocol Buffers for C++

Prerequisites


 - cmake 3.16 or later (https://vitux.com/how-to-install-cmake-on-ubuntu/)

1. Configures a directory for locally installed packages and ensures the executables are easily accessible from the command line


    ```bash

     ~$ export LOCAL_INSTALL_DIR=$HOME/.local

     ~$ mkdir -p $LOCAL_INSTALL_DIR

     ~$ export PATH="$LOCAL_INSTALL_DIR/bin:$PATH"

2. Install the basic tools required to build gRPC

     ```bash

     ~$ sudo apt install -y build-essential autoconf libtool pkg-config

3. Clone the grpc repo and its submodules

     ```bash

     ~$ git clone --recurse-submodules -b v1.66.0 --depth 1 --shallow-submodules https://github.com/grpc/grpc

4. Build and locally install gRPC and Protocol Buffers

     ```bash

     ~$ cd grpc

     ~/grpc$ mkdir -p cmake/build

     ~/grpc$ pushd cmake/build

     ~grpc/cmake/build$ cmake -DgRPC_INSTALL=ON \

                              -DgRPC_BUILD_TESTS=OFF \

                              -DCMAKE_INSTALL_PREFIX=$LOCAL_INSTALL_DIR \

                              ../..

     ~grpc/cmake/build$ make -j 4

     ~grpc/cmake/build$ make install

     ~grpc/cmake/build$ popd

5. Build the project


    in `~/grpc/examples/protos/` save .proto file


    in `~/grpc/examples/cpp/` create new directory `myproject` containing source .cc code and CMakeLists.txt


    ```bash

    ~/grpc$ cd examples/cpp/myproject

    ~/grpc/examples/cpp/myproject$ mkdir -p cmake/build

    ~/grpc/examples/cpp/myproject$ pushd cmake/build

    ~/grpc/examples/cpp/myproject/cmake/build$ cmake -DCMAKE_PREFIX_PATH=$LOCAL_INSTALL_DIR ../..

    ~/grpc/examples/cpp/myproject/cmake/build$ make -j 4

6. Run the project from the project `build` directory


    ```bash

    ~/grpc/examples/cpp/myproject/cmake/build$ ./app



## Build and locally install gRPC and Protocol Buffers for Python

Prerequisites


 - Python 3.7 or higher

 - pip version 9.0.1 or higher



1. Install gRPC

   ```bash

   ~$ python3 -m pip install grpcio

2. Install gRPC tools

   ```bash

   ~$ python3 -m pip install grpcio-tools

3. Build the project


   create new directory `myproject` containing .proto file and source .py code


5. Run the project


   from project directory `myproject` in terminal run `python3 app.py`



# 🔸 From Python script to Linux service using systemd

A daemon (or service) is a background process that is designed to run autonomously,with little or not user intervention. Services will start automatically every time the system starts, which eliminates the need to start it manually. Scripts that collect data, represent servers or similar are ideal candidates to be configured as services and not ordinary scripts.


  

1. Write Python script you want to make as service `/path/to/your_script.py`

2. Make your Python script executable

   ```bash

   ~$ chmod +x /path/to/your_script.py

4. Create systemd service file in directory `/etc/systemd/system/`.  Systemd service files need to be in `/etc/systemd/system/` DIR!

   ```bash

   ~$ sudo nano /etc/systemd/system/your_script.service

5. Add following content to your .service file

   ```bash

   [Unit]

   Description=Python Script Service

   After=network.target

   

   [Service]

   ExecStart=/usr/bin/python3 /path/to/your_script.py

   Restart=always

   User=your_user

   WorkingDirectory=/path/to/

   Environment="PATH=/usr/bin"

   

   [Install]

   WantedBy=multi-user.target



6. Reload systemd to recognise new service `your_script.service`

   ```bash

   sudo systemctl daemon-reload

8. Enable new service at system startup

   ```bash

   sudo systemctl enable your_script.service

10. Run service

    ```bash

    sudo systemctl start your_script.service

11. Managing the service

    - stop service

      ```bash

      sudo systemctl stop your_script.service

    - restart service

      ```bash

      sudo systemctl stop your_script.service

    - disable service at system startup

      ```bash

      sudo systemctl disable your_script.service