Add log cleanup function (15-day deletion) and archive documentation

- Added cleanup_old_logs() function to app_v3_simplified.py
- Deletes log.txt if older than 15 days at app startup
- Sends notification to monitoring server when cleanup occurs
- Archived all legacy modules and documentation to oldcode/
- Updated device_info.txt with correct IP (192.168.1.104)
- All changes validated and tested

oldcode/connectivity_module.py

@@ -0,0 +1,94 @@
+"""
+Network connectivity and backup data handling
+"""
+
+import subprocess
+import time
+import requests
+import logging
+from config_settings import CONNECTIVITY_CHECK_HOST, CONNECTIVITY_CHECK_INTERVAL, TAG_FILE
+from logger_module import log_with_server
+
+
+def check_internet_connection(hostname, device_ip, on_connect_callback=None):
+    """
+    Check internet connection periodically
+    
+    Args:
+        hostname: Device hostname
+        device_ip: Device IP
+        on_connect_callback: Optional callback function when internet is restored
+    """
+    log_with_server('Internet connection check loaded', hostname, device_ip)
+    
+    while True:
+        try:
+            # Check connection to the specified host
+            response = subprocess.run(
+                ["ping", "-c", "1", CONNECTIVITY_CHECK_HOST],
+                stdout=subprocess.DEVNULL,
+                stderr=subprocess.DEVNULL,
+                timeout=5
+            )
+            
+            if response.returncode == 0:
+                log_with_server(f"Internet is up! Waiting {CONNECTIVITY_CHECK_INTERVAL}s.", hostname, device_ip)
+                
+                # Call callback if internet restored
+                if on_connect_callback:
+                    try:
+                        on_connect_callback()
+                    except Exception as e:
+                        log_with_server(f"Callback error: {e}", hostname, device_ip)
+                
+                time.sleep(CONNECTIVITY_CHECK_INTERVAL)
+            else:
+                log_with_server("Internet is down", hostname, device_ip)
+                time.sleep(10)  # Retry every 10 seconds when offline
+                
+        except subprocess.TimeoutExpired:
+            log_with_server("Ping timeout", hostname, device_ip)
+            time.sleep(10)
+        except Exception as e:
+            log_with_server(f"Connection check error: {e}", hostname, device_ip)
+            time.sleep(10)
+
+
+def post_backup_data(hostname, device_ip):
+    """
+    Post backup data to Harting server
+    Reads URLs from tag.txt and attempts to POST to each one
+    
+    Args:
+        hostname: Device hostname
+        device_ip: Device IP
+    """
+    try:
+        with open(TAG_FILE, "r") as file:
+            lines = file.readlines()
+        
+        remaining_lines = lines[:]
+        
+        for line in lines:
+            line = line.strip()
+            if line:
+                try:
+                    response = requests.post(line, verify=False, timeout=3)
+                    response.raise_for_status()
+                    log_with_server(f"Data posted successfully to {line}", hostname, device_ip)
+                    remaining_lines.remove(line + "\n")
+                except requests.exceptions.Timeout:
+                    log_with_server("Request timed out.", hostname, device_ip)
+                    break
+                except requests.exceptions.RequestException as e:
+                    log_with_server(f"An error occurred posting data: {e}", hostname, device_ip)
+                    break
+        
+        # Update tag file with remaining lines
+        with open(TAG_FILE, "w") as file:
+            file.writelines(remaining_lines)
+    
+    except FileNotFoundError:
+        log_with_server("No backup file found.", hostname, device_ip)
+    except Exception as e:
+        log_with_server(f"Error posting backup data: {e}", hostname, device_ip)