v1.0 .

app.py

@@ -4,13 +4,38 @@ import time
 import os
 from opcua_connector import opcua_connector
 
-# Load config early for password if present
+class app:
-try:
+    def __init__(self):
-    _APP_CFG = yaml.safe_load(open('./cfg.yaml')) or {}
+        self.app_cfg = yaml.safe_load(open('./cfg.yaml')) or {}
-except Exception:
+        self.OPCon = opcua_connector(self.app_cfg)
-    _APP_CFG = {}
 
-OPCcon = opcua_connector(_APP_CFG)
+    def initialize_connection(self):
+        """Initialize OPC UA connection"""
+        try:
+            self.OPCon.connect()
+            if self.OPCon.check_connection() == 1:
+                st.session_state.connection_status = "Connected"
+                print("🎉 Connection initialized successfully")
+                return True
+            st.session_state.connection_status = "Disconnected"
+            return False
+        except Exception as e:
+            print(f"❌ Failed to initialize connection: {e}")
+            st.session_state.connection_status = "Disconnected"
+            return False
+
+    def execute_button_action(self, button_name):
+        """Execute button action with proper error handling"""
+        if button_name == 'INIT':
+            self.OPCon.adapt_access_rights()
+            print(f"🔧 INIT button pressed - Access rights adapted")
+        else:
+            self.OPCon.press_btn(button_name)
+            print(f"🔘 {button_name} button pressed")
+        return True
+
+# Load config early for password if present
+app = app()
 
 # Page configuration
 st.set_page_config(
@@ -20,130 +45,28 @@ st.set_page_config(
     initial_sidebar_state="expanded"
 )
 
-# Custom CSS for better styling
+# Custom CSS for better styling (external stylesheet)
-st.markdown("""
+with open('styles.css') as f:
-<style>
+    st.markdown(f"<style>{f.read()}</style>", unsafe_allow_html=True)
-    .main-header {
-        text-align: center;
-        color: #1f77b4;
-        margin-bottom: 2rem;
-    }
-    .button-container {
-        display: flex;
-        justify-content: center;
-        gap: 2rem;
-        margin: 2rem 0;
-        flex-wrap: wrap;
-    }
-    .control-button {
-        display: flex;
-        flex-direction: column;
-        align-items: center;
-        padding: 1.5rem;
-        border-radius: 15px;
-        background: linear-gradient(145deg, #f0f2f6, #ffffff);
-        box-shadow: 5px 5px 15px #d1d9e6, -5px -5px 15px #ffffff;
-        transition: all 0.3s ease;
-        min-width: 150px;
-        cursor: pointer;
-    }
-    .control-button:hover {
-        transform: translateY(-2px);
-        box-shadow: 8px 8px 20px #d1d9e6, -8px -8px 20px #ffffff;
-    }
-    .status-indicator {
-        padding: 0.5rem 1rem;
-        border-radius: 20px;
-        font-weight: bold;
-        text-align: center;
-        margin: 1rem 0;
-    }
-    .status-connected {
-        background-color: #d4edda;
-        color: #155724;
-        border: 1px solid #c3e6cb;
-    }
-    .status-disconnected {
-        background-color: #f8d7da;
-        color: #721c24;
-        border: 1px solid #f5c6cb;
-    }
-    .log-container {
-        background-color: #f8f9fa;
-        border: 1px solid #dee2e6;
-        border-radius: 5px;
-        padding: 1rem;
-        max-height: 300px;
-        overflow-y: auto;
-    }
-    .stButton > button {
-        height: 60px !important;
-        font-size: 14px !important;
-        font-weight: bold !important;
-        border-radius: 10px !important;
-        border: 2px solid #e0e0e0 !important;
-        transition: all 0.3s ease !important;
-    }
-    .stButton > button:hover {
-        transform: translateY(-2px) !important;
-        box-shadow: 0 4px 8px rgba(0,0,0,0.2) !important;
-        border-color: #1f77b4 !important;
-    }
-</style>
-""", unsafe_allow_html=True)
 
 # Initialize session state
-if 'opcua_connector' not in st.session_state:
-    st.session_state.opcua_connector = None
 if 'connection_status' not in st.session_state:
     st.session_state.connection_status = "Disconnected"
 if 'authenticated' not in st.session_state:
     st.session_state.authenticated = False
 
 # Re-validate connection status each render (do this before rendering UI)
-def is_opcua_connected(OPCcon) -> bool:
+def is_opcua_connected(conn) -> bool:
     try:
-        if OPCcon is None:
+        return bool(conn and conn.check_connection() == 1)
-            return False
-        return OPCcon.check_connection() == 1
     except Exception:
         return False
 
-if st.session_state.opcua_connector and is_opcua_connected(st.session_state.opcua_connector):
+st.session_state.connection_status = (
-    if st.session_state.connection_status != "Connected":
+    "Connected" if is_opcua_connected(app.OPCon) else "Disconnected"
-        st.session_state.connection_status = "Connected"
+)
-else:
-    if st.session_state.connection_status != "Disconnected":
-        st.session_state.connection_status = "Disconnected"
 
 
-def initialize_connection():
-    """Initialize OPC UA connection"""
-    try:
-        # Connect and check status
-        OPCcon.connect()
-        if OPCcon.check_connection() == 1:
-            st.session_state.opcua_connector = OPCcon
-            st.session_state.connection_status = "Connected"
-            print("🎉 Connection initialized successfully")
-            return True
-        
-        st.session_state.connection_status = "Disconnected"
-        return False
-    except Exception as e:
-        print(f"❌ Failed to initialize connection: {e}")
-        st.session_state.connection_status = "Disconnected"
-        return False
-
-def execute_button_action(button_name):
-    """Execute button action with proper error handling"""
-    if button_name == 'INIT':
-        OPCcon.adapt_access_rights()
-        print(f"🔧 INIT button pressed - Access rights adapted")
-    else:
-        OPCcon.press_btn(button_name)
-        print(f"🔘 {button_name} button pressed")
-    return True
 
 # Sidebar
 with st.sidebar:
@@ -152,22 +75,16 @@ with st.sidebar:
     # Initialize button
     if st.button("🔌 Initialize Connection", use_container_width=True):
         with st.spinner("Initializing connection..."):
-            initialize_connection()
+            app.initialize_connection()
             st.rerun()
     
     # Disconnect button
     if st.button("🔌 Disconnect", use_container_width=True):
-        if st.session_state.opcua_connector:
+        try:
-            try:
+            app.OPCon.disconnect()
-                
+            print("🔌 Disconnected from OPC UA server")
-                # Disconnect OPC UA using the new method
+        except Exception as e:
-                st.session_state.opcua_connector.disconnect()
+            print(f"⚠️ Warning during disconnect: {e}")
-                print("🔌 Disconnected from OPC UA server")
-                
-            except Exception as e:
-                print(f"⚠️ Warning during disconnect: {e}")
-        
-        st.session_state.opcua_connector = None
         st.session_state.connection_status = "Disconnected"
         print("🔌 Connection reset")
         st.rerun()
@@ -179,8 +96,7 @@ with st.sidebar:
 # Password gate
 # Prefer cfg.yaml cred.dashboard.password, else env DASHBOARD_PASSWORD, else 'admin'
 expected_password = (
-    (_APP_CFG.get('cred', {}).get('dashboard', {}) or {}).get('password')
+    (app.app_cfg.get('cred', {}).get('dashboard', {}) or {}).get('password')
-    or os.getenv('DASHBOARD_PASSWORD')
     or 'admin'
 )
 ui_locked = not st.session_state.authenticated
@@ -204,19 +120,19 @@ if not ui_locked:
 
     with btn_col1:
         if st.button("🔧\n\nINIT", key="init_btn", use_container_width=True, disabled=buttons_disabled):
-            execute_button_action('INIT')
+            app.execute_button_action('INIT')
 
     with btn_col2:
         if st.button("▶️\n\nSTART", key="start_btn", use_container_width=True, disabled=buttons_disabled):
-            execute_button_action('BTN_START')
+            app.execute_button_action('BTN_START')
 
     with btn_col3:
         if st.button("⏹️\n\nSTOP", key="stop_btn", use_container_width=True, disabled=buttons_disabled):
-            execute_button_action('BTN_STOP')
+            app.execute_button_action('BTN_STOP')
 
     with btn_col4:
         if st.button("🔄\n\nRESET", key="reset_btn", use_container_width=True, disabled=buttons_disabled):
-            execute_button_action('BTN_RESET')
+            app.execute_button_action('BTN_RESET')
 
     st.markdown('</div>', unsafe_allow_html=True)
 

styles.css

@@ -0,0 +1,68 @@
+.main-header {
+    text-align: center;
+    color: #1f77b4;
+    margin-bottom: 2rem;
+}
+.button-container {
+    display: flex;
+    justify-content: center;
+    gap: 2rem;
+    margin: 2rem 0;
+    flex-wrap: wrap;
+}
+.control-button {
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    padding: 1.5rem;
+    border-radius: 15px;
+    background: linear-gradient(145deg, #f0f2f6, #ffffff);
+    box-shadow: 5px 5px 15px #d1d9e6, -5px -5px 15px #ffffff;
+    transition: all 0.3s ease;
+    min-width: 150px;
+    cursor: pointer;
+}
+.control-button:hover {
+    transform: translateY(-2px);
+    box-shadow: 8px 8px 20px #d1d9e6, -8px -8px 20px #ffffff;
+}
+.status-indicator {
+    padding: 0.5rem 1rem;
+    border-radius: 20px;
+    font-weight: bold;
+    text-align: center;
+    margin: 1rem 0;
+}
+.status-connected {
+    background-color: #d4edda;
+    color: #155724;
+    border: 1px solid #c3e6cb;
+}
+.status-disconnected {
+    background-color: #f8d7da;
+    color: #721c24;
+    border: 1px solid #f5c6cb;
+}
+.log-container {
+    background-color: #f8f9fa;
+    border: 1px solid #dee2e6;
+    border-radius: 5px;
+    padding: 1rem;
+    max-height: 300px;
+    overflow-y: auto;
+}
+.stButton > button {
+    height: 60px !important;
+    font-size: 14px !important;
+    font-weight: bold !important;
+    border-radius: 10px !important;
+    border: 2px solid #e0e0e0 !important;
+    transition: all 0.3s ease !important;
+}
+.stButton > button:hover {
+    transform: translateY(-2px) !important;
+    box-shadow: 0 4px 8px rgba(0,0,0,0.2) !important;
+    border-color: #1f77b4 !important;
+}
+
+