app_backup.py

import json
import queue
import time
import secrets

import paho.mqtt.client as mqtt
import streamlit as st
import matplotlib.pyplot as plt

# Initialize Streamlit app
st.title("Motor Control Panel")

# Description and context
st.markdown(
    """
This application accesses a public test demo of a motor control located in
Toronto, ON, Canada (as of 2024-07-27). Send speed commands to the motor and
visualize the RPM data.

For more context, you
can refer to this [Colab
notebook](https://colab.research.google.com/github/sparks-baird/self-driving-lab-demo/blob/main/notebooks/4.2-paho-mqtt-colab-sdl-demo-test.ipynb)
and the [self-driving-lab-demo
project](https://github.com/sparks-baird/self-driving-lab-demo). You may also be
interested in the Acceleration Consortium's ["Hello World"
microcourse](https://ac-microcourses.readthedocs.io/en/latest/courses/hello-world/index.html)
for self-driving labs.
"""
)

with st.form("mqtt_form"):

    # MQTT Configuration
    HIVEMQ_HOST = st.text_input(
        "Enter your HiveMQ host:",
        "248cc294c37642359297f75b7b023374.s2.eu.hivemq.cloud",
        type="password",
    )
    HIVEMQ_USERNAME = st.text_input("Enter your HiveMQ username:", "sgbaird")
    HIVEMQ_PASSWORD = st.text_input(
        "Enter your HiveMQ password:", "D.Pq5gYtejYbU#L", type="password"
    )
    PORT = st.number_input(
        "Enter the port number:", min_value=1, max_value=65535, value=8883
    )

    # User input for the Pico ID
    PICO_ID = st.text_input("Enter your Pico ID:", "test-fan", type="password")

    # Sliders for speed values
    speed = st.slider("Select the Speed value:", min_value=0, max_value=100, value=0)

    submit_button = st.form_submit_button(label="Send Speed Command")

command_topic = f"sdl-demo/picow/{PICO_ID}/motor/speed/"
rpm_data_topic = f"sdl-demo/picow/{PICO_ID}/motor/rpm/"

# random session id to keep track of the session and filter out old data
experiment_id = secrets.token_hex(4)  # 4 bytes = 8 characters

rpm_data_queue = queue.Queue()


# Singleton: https://docs.streamlit.io/develop/api-reference/caching-and-state/st.cache_resource
@st.cache_resource
def create_paho_client(tls=True):
    client = mqtt.Client(protocol=mqtt.MQTTv5)
    if tls:
        client.tls_set(tls_version=mqtt.ssl.PROTOCOL_TLS_CLIENT)
    return client


# Define setup separately since sensor_data is dynamic
def setup_paho_client(
    client, rpm_data_topic, hostname, username, password=None, port=8883
):
    def on_message(client, userdata, msg):
        rpm_data_queue.put(json.loads(msg.payload))

    def on_connect(client, userdata, flags, rc, properties=None):
        if rc != 0:
            print("Connected with result code " + str(rc))
        client.subscribe(rpm_data_topic, qos=1)

    client.on_connect = on_connect
    client.on_message = on_message

    client.username_pw_set(username, password)
    client.connect(hostname, port)
    client.loop_start()  # Use a non-blocking loop

    return client


def send_command(client, command_topic, msg):
    print("Sending command...")
    result = client.publish(command_topic, json.dumps(msg), qos=2)
    result.wait_for_publish()  # Ensure the message is sent

    if result.rc == mqtt.MQTT_ERR_SUCCESS:
        print(f"Command sent: {msg} to topic {command_topic}")
    else:
        print(f"Failed to send command: {result.rc}")


# Helper function to plot RPM data
def plot_rpm_data(ax1, ax2, rpm_data):
    times = [data["time"] for data in rpm_data]
    rpm_values = [data["rpm"] for data in rpm_data]

    ax1.clear()
    ax1.plot(times, rpm_values, "-o", color="blue")
    ax1.set_xlabel("Time (s)", fontsize=14)
    ax1.set_ylabel("RPM", fontsize=14)
    ax1.set_title("Motor RPM over Time", fontsize=16)

    ax2.clear()
    ax2.plot(times, rpm_values, "-o", color="blue")
    ax2.set_ylim(0, max(1.1 * max(rpm_values), 1.1))  # Set fixed y-axis limits
    ax2.set_xlabel("Time (s)")
    ax2.set_ylabel("RPM (scaled)")
    ax2.set_title("RPM Data Stream")

    st.pyplot(fig)


# Function to check and update RPM data periodically
def check_rpm_data():
    rpm_data = []
    global fig, ax1, ax2
    fig, (ax1, ax2) = plt.subplots(2, 1, figsize=(10, 8))

    start_time = time.time()
    last_data_time = start_time
    timeout = 15  # Timeout duration in seconds

    rpm_display = st.empty()

    while True:
        current_time = time.time()
        if not rpm_data_queue.empty():
            data = rpm_data_queue.get()
            elapsed_time = current_time - start_time
            data["time"] = elapsed_time
            rpm_data.append(data)
            last_data_time = current_time

            with rpm_display.container():
                plot_rpm_data(ax1, ax2, rpm_data)
                st.write("RPM Data Received:", data)

        if current_time - last_data_time > timeout:
            st.error(
                f"No RPM data received for {timeout} seconds. Please check the system."
            )
            break

        time.sleep(1)


# Publish button
if submit_button:
    if not PICO_ID or not HIVEMQ_HOST or not HIVEMQ_USERNAME or not HIVEMQ_PASSWORD:
        st.error("Please enter all required fields.")
    else:
        st.info(
            f"Please wait while the command {speed} for experiment {experiment_id} is sent..."
        )

        client = create_paho_client(tls=True)

        client = setup_paho_client(
            client,
            rpm_data_topic,
            HIVEMQ_HOST,
            HIVEMQ_USERNAME,
            password=HIVEMQ_PASSWORD,
            port=int(PORT),
        )

        command_msg = {"speed": speed, "_experiment_id": experiment_id}

        send_command(client, command_topic, command_msg)
        st.success(f"Command {speed} for experiment {experiment_id} sent successfully!")

# Start periodic check for RPM data
check_rpm_data()