diff --git a/loop/SARA_send_data_v2.py b/loop/SARA_send_data_v2.py
index b6f26ce..731bc1d 100755
--- a/loop/SARA_send_data_v2.py
+++ b/loop/SARA_send_data_v2.py
@@ -99,6 +99,7 @@ import time
 import busio
 import re
 import os
+import requests
 import traceback
 import threading
 import sys
@@ -325,6 +326,7 @@ try:
     row = cursor.fetchone()  # Get the first (and only) row
     rtc_time_str = row[1]  # '2025-02-07 12:30:45' ou '2000-01-01 00:55:21' ou 'not connected'
     print(rtc_time_str)
+
     if rtc_time_str == 'not connected':
         print("⛔ Atttention RTC module not connected⛔")
         rtc_status = "disconnected"
@@ -481,14 +483,37 @@ try:
     response2 = read_complete_response(ser_sara, wait_for_lines=["OK"])
 
     #Here it's possible that the SARA do not repond at all
-    #-> try to establish connection
+    #-> TO DO : harware reboot
+    #-> send notification
     #-> end loop, no need to continue
     if response2 is None or response2 == "" or not any(expected in response2 for expected in ["OK", "ERROR", "+", "AT"]):
         print("No answer from SARA module")
         print('🛑STOP LOOP🛑')
         print("<hr>")
+
+       # Send notification
+        try:
+            # Format the URL with the device_id
+            alert_url = f'http://data.nebuleair.fr/pro_4G/alert.php?capteur_id={device_id}&error_type=serial_error'
+            
+            # Send POST request with short timeout
+            response = requests.post(alert_url, timeout=3)
+            
+            if response.status_code == 200:
+                print(f"Alert notification sent successfully")
+            else:
+                print(f"Alert notification failed with status code: {response.status_code}")
+                
+        except Exception as e:
+            # Catch any exception and continue
+            print(f"Alert notification failed: {e}")
+        
+        #end loop
         sys.exit()
 
+    else :
+        print("✅SARA is connected over serial")
+
     print('<p class="text-danger-emphasis">')
     print(response2)
     print("</p>", end="")
@@ -730,9 +755,9 @@ try:
                         
                         print(f'<div class="text-primary">Time difference: {time_diff:.2f} seconds</div>', end="")
                         
-                        # Check if difference is more than 10 seconds
+                        # Check if difference is more than 60 seconds
                         # and update the RTC clock
-                        if time_diff > 10:
+                        if time_diff > 60:
                             print(f'<div class="text-warning"><strong>⚠️ RTC time differs from server time by {time_diff:.2f} seconds!</strong></div>', end="")
                             # Format server time for RTC update
                             server_time_formatted = server_datetime.strftime('%Y-%m-%d %H:%M:%S')
diff --git a/sqlite/create_db.py b/sqlite/create_db.py
index 8024cae..22b8553 100755
--- a/sqlite/create_db.py
+++ b/sqlite/create_db.py
@@ -30,6 +30,15 @@ cursor.execute("""
     VALUES (1, CURRENT_TIMESTAMP);
 """)
 
+#create a modem status table
+cursor.execute("""
+CREATE TABLE IF NOT EXISTS modem_status (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    timestamp TEXT,
+    status TEXT
+)
+""")
+
 # Create a table NPM
 cursor.execute("""
 CREATE TABLE IF NOT EXISTS data_NPM (