The Purpose of the app is to save medical info for the users and get it linked with NFC tag…there should be medical id of each user.

I have created a streamlit application and it is opening but as I don’t have nfc tag currently, so have no idea like how it will work when nfc tag is detected nearby.

The code is:

import streamlit as st
import sqlite3
import nfc
from datetime import datetime

# Initialize SQLite database
conn = sqlite3.connect('********.db', check_same_thread=False)
c = conn.cursor()
c.execute('''
    CREATE TABLE IF NOT EXISTS users (
        id INTEGER PRIMARY KEY AUTOINCREMENT,
        nfc_tag_id TEXT UNIQUE,
        name TEXT,
        age INTEGER,
        blood_type TEXT,
        allergies TEXT,
        medications TEXT,
        medical_conditions TEXT,
        emergency_contact TEXT,
        insurance_info TEXT,
        last_checkup DATE
    )
''')

def save_medical_info(nfc_tag_id, name, age, blood_type, allergies, medications, conditions, contact, insurance, checkup):
    try:
        c.execute('''
            INSERT INTO users (nfc_tag_id, name, age, blood_type, allergies, medications, medical_conditions, emergency_contact, insurance_info, last_checkup)
            VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
        ''', (nfc_tag_id, name, age, blood_type, allergies, medications, conditions, contact, insurance, checkup))
        conn.commit()
        st.success("Information saved successfully!")
    except sqlite3.IntegrityError:
        st.error("Error: NFC Tag ID already exists or invalid data")

def read_nfc_tag():
    try:
        # You may need to adjust 'usb', 'ttyACM0', or 'serial' based on your NFC reader connection
        connection_type = 'usb'  # Default to 'usb', adjust as needed

        if connection_type == 'usb':
            clf = nfc.ContactlessFrontend('usb')
        elif connection_type == 'ttyACM0':
            clf = nfc.ContactlessFrontend('ttyACM0')
        elif connection_type == 'serial':
            clf = nfc.ContactlessFrontend('serial')
        else:
            raise ValueError(f"Unsupported connection type: {connection_type}")

        tag = clf.connect(rdwr={'on-connect': lambda tag: False})
        tag_id = tag.identifier.decode('utf-8')
        st.write(f"Raw Tag ID: {tag.identifier}")
        return tag_id
    except Exception as e:
        st.error(f"Error reading NFC tag: {e}")
        return None

def main():
    st.title("Holistica World")

    nfc_tag_detected = False
    user_id = None

    if st.button("Search for NFC Tag"):
        user_id = read_nfc_tag()  # Try to read NFC tag
        if user_id:
            nfc_tag_detected = True
            st.write(f"NFC Tag ID: {user_id}")
        else:
            st.write("NFC tag not detected. Please enter information manually.")
            nfc_tag_detected = False

    with st.form(key='medical_info_form'):
        if not nfc_tag_detected:
            user_id = st.text_input("Enter User ID", value='')

        name = st.text_input("Name")
        age = st.number_input("Age", min_value=0)
        blood_type = st.text_input("Blood Type")
        allergies = st.text_input("Allergies")
        medications = st.text_input("Medications")
        conditions = st.text_input("Medical Conditions")
        contact = st.text_input("Emergency Contact")
        insurance = st.text_input("Insurance Info")
        checkup = st.date_input("Last Checkup Date")
        
        submit_button = st.form_submit_button("Save Information")
        
        if submit_button:
            # Save the new information
            save_medical_info(user_id if nfc_tag_detected else None, name, age, blood_type, allergies, medications, conditions, contact, insurance, checkup)

if __name__ == '__main__':
    main()

# Close the database connection when the app ends
conn.close()

When I am clicking on Search For NFC Tag button, I am getting error which is
Error reading NFC tag: [Errno 19] No such device.

Rest, If I am entering user information manually, then it is being stored in sqlite3 db correctly.

What correction do I need to make in my code so that it will get linked to nfc tag. Any idea?