Week 2 Progress Report ·

Table of Contents

# Topics To Be Covered In This Post
#

What I did this week
- Implement Settings Window
- Initial support for Kuksa Signals
- Initializing the GitHub Repository
What I plan to do next

# Settings Window
#

This week I implemented the settings window to start/ configure an instance of kuksa-client to be used across the whole application. Features of this module are as follows:

Configure Kuksa-client
- Custom IP address
- JWT token path
- Toggle for Insecure mode
Start/ Reconnect Kuksa-client
Display Connection Status

How Does it Work?
#

We first created a KuksaSingleton module using the Singleton Design Pattern. The benefits of using the Singleton design pattern are:

Initialization: An object created by the Singleton method is initialized only when it is requested for the first time.
Access to the object: We get global access to the instance of the object.
Count of instances: In singleton, method classes can’t have more than one instance

This allows us to maintain a single instance of the kuksa-client object, and have access to it globally.


import kuksa_client as kuksa

class KuksaClientSingleton:
    __instance = None

    @staticmethod
    def get_instance():
        if KuksaClientSingleton.__instance is None:
            KuksaClientSingleton()
        return KuksaClientSingleton.__instance

    def __init__(self):
        if KuksaClientSingleton.__instance is not None:
            raise Exception("This class is a singleton!")
        else:
            self.default_Config = {
                "ip": '10.10.10.203',
                "port": "8090",
                'protocol': 'ws',
                'insecure': True,
            }

            self.token = "/home/suchinton/.local/lib/\
            python3.10/site-\
            packages/kuksa_certificates/jwt/\
            super-admin.json.token"

            try:
                self.client = kuksa.KuksaClientThread\
                (self.default_Config)
                self.client.authorize(self.token)
                self.client.start()
            except Exception as e:
                print(e)

            KuksaClientSingleton.__instance = self

    def get_client(self):
        return self.client, self.default_Config, self.token

    def reconnect_client(self, new_Config, new_Token):
        self.client.stop()
        print(self.client.checkConnection())
        self.client = kuksa.KuksaClientThread(new_Config)
        self.client.authorize(new_Token)
        self.client.start()

    def __del__(self):
        self.client.stop()

This implementation allows us to write custom functions such as reconnect_client which helps restart the client with new configurations.

Note: This module will be modified to read and write to a config file which will store the default values and the previous entries.

Accessing the Kuksa-Client Object
#

As visible in the above code segment, the client object, its default_Config and the default token path can be retrieved using the get_client method in other modules of this application.

All we need to do to get access to the client instance is add the necessary module as such:

.
.
.
import sys

current_dir = os.path.dirname(os.path.abspath(__file__))

# ========================================

sys.path.append(os.path.dirname(current_dir))

import extras.Kuksa_Instance as kuksa_instance

.
.
.

and to create the client object, the following syntax is used:

self.kuksa = kuksa_instance.KuksaClientSingleton.get_instance()
self.client, self.config, self.token = self.kuksa.get_client()

Settings Window
#

The impedimented settings menu was made keeping certain requirements in mind, such as:

The client’s first instance must be started only via the settings
The user should be able to restart the client
The settings menu must allow the user to modify the default config
It must reflect the status of the connection with Kuksa

Note: The StyleSheet is yet to be updated for the Settings Window

# Kuksa Signals for IC Application
#

I also added initial support for the IC application by specifying its VSS paths subscribed by it, this allows us to control the visible widget values and states using dials, buttons and input fields.

The implementation in the Demo application had some flaws that I was able to overcome this week by optimizing the slider for a smoother experience. This was done using the following Qt modules:

QTimer object to update the values at a fixed interval instead of updating it every time the slider value changes. This reduces the number of requests sent to the server and makes the application more responsive.
QThread object to run the timer in a separate thread so that it doesn’t block the main thread and cause the application to freeze.

As a consequence, the app is more responsive, and also the values fed to kuksa-val-server using this method are continuously updated at defined intervals. Which can help us implement dedicated scripts for the AGL demo apps in the future.

The signal paths specified for the application comply with the recently released VSS 3.1.1. being used by KUKSA.val 0.3.1.

Note: During this week’s GSoC meeting, my mentors mentioned that since AGL does not, for the time being, use any navigation APIs, We have decided to make the Navigation Widget (mentioned in last week’s report) an optional module.

# GitHub Repository
#

This week I also initialized the GitHub repository for this project, hosting it under the Apache V2 License after a discussion regarding the same with my mentors.

The repository can be accessed using the provided link.

→ https://github.com/suchinton/AGL_Demo_Control_Panel