Notify DAC output

[BECATRUE]

This resolves #76.

One can receive the DAC outputs of a specific channel in real time using the following code:

import time
import json

import requests
from websockets.sync.client import connect

HTTP_BASE_URL = 'http://localhost:8000'
WS_BASE_URL = 'ws://localhost:8000'
CHANNEL = 5

def build_cookie_header(session: requests.Session) -> str:
    cookies = session.cookies.get_dict()
    return "; ".join(f"{k}={v}" for k, v in cookies.items())


with requests.Session() as session:
    # Sign in
    data = {'username': 'OOOO', 'password': 'OOOO'}
    response = session.post(HTTP_BASE_URL + '/api/user/signin/', json=data)
    response.raise_for_status()

    csrf_token = session.cookies.get('csrftoken')
    headers = {'X-CSRFToken': csrf_token}

    # Receive voltages
    cookies = build_cookie_header(session)
    ws_url = f'{WS_BASE_URL}/ws/pid_setting/dac_output/{CHANNEL}/'
    with connect(
        ws_url,
        origin='http://localhost:3000',
        additional_headers =[
            ('Cookie', cookies),
        ]
    ) as websocket:
        while True:
            message = websocket.recv()
            print(message)  # e.g., {"voltage": 1.0}

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[kangz12345]

What is this update for?

[kangz12345]

Ah, it's from #97.

[kangz12345]

LGTM

[kangz12345]

Ah, it's from #97.