diff --git a/SARA/check_running.py b/SARA/check_running.py
index fcda7e0..b41a83c 100644
--- a/SARA/check_running.py
+++ b/SARA/check_running.py
@@ -3,10 +3,10 @@ Check if the main loop is running
 /usr/bin/python3 /var/www/nebuleair_pro_4g/tests/check_running.py
 '''
 import psutil
-import subprocess
+import json
 
 def is_script_running(script_name):
-    """Check if a given Python script is running."""
+    """Check if a given Python script is currently running."""
     for process in psutil.process_iter(['pid', 'cmdline']):
         if process.info['cmdline'] and script_name in " ".join(process.info['cmdline']):
             return True  # Script is running
@@ -14,7 +14,14 @@ def is_script_running(script_name):
 
 script_to_check = "/var/www/nebuleair_pro_4g/loop/SARA_send_data_v2.py" 
 
-if is_script_running(script_to_check):
-    print(f"{script_to_check} is still running.❌❌❌")
-else:
-    print(f"{script_to_check} is NOT running.✅✅✅")
+# Determine script status
+is_running = is_script_running(script_to_check)
+
+# Create JSON response
+response = {
+    "message": "The script is still running.❌❌❌" if is_running else "The script is NOT running.✅✅✅",
+    "running": is_running
+}
+
+# Print JSON output
+print(json.dumps(response, indent=4))  # Pretty print for readability
diff --git a/html/launcher.php b/html/launcher.php
index e698ab6..7d07375 100755
--- a/html/launcher.php
+++ b/html/launcher.php
@@ -44,6 +44,12 @@ if ($type == "update_config") {
     echo "Config updated!";
 }
 
+if ($type == "getModem_busy") {
+    $command = '/usr/bin/python3 /var/www/nebuleair_pro_4g/SARA/check_running.py';
+    $output = shell_exec($command);
+    echo $output;
+}
+
 if ($type == "RTC_time") {
     $time = shell_exec("date '+%d/%m/%Y %H:%M:%S'");
     echo $time;
diff --git a/html/logs.html b/html/logs.html
index d73fdcf..3840845 100755
--- a/html/logs.html
+++ b/html/logs.html
@@ -57,7 +57,7 @@
             <div class="card" style="height: 80vh;">
               <div class="card-header">
                 Master logs  <button type="submit" class="btn btn-secondary btn-sm" onclick="clear_loopLogs()">Clear</button>
-
+                  <span id="script_running"></span>
               </div>
               <div class="card-body overflow-auto" id="card_loop_content">
 
@@ -166,6 +166,9 @@
 
 
 window.onload = function() {
+  getModem_busy_status();
+  setInterval(getModem_busy_status, 2000);
+
     fetch('../config.json') // Replace 'deviceID.txt' with 'config.json'
         .then(response => response.json()) // Parse response as JSON
         .then(data => {
@@ -221,6 +224,37 @@ function clear_loopLogs(){
             }
         });
       }
+
+function getModem_busy_status() {
+    console.log("Getting modem busy status");
+
+    const script_is_running = document.getElementById("script_running");
+
+    $.ajax({
+        url: 'launcher.php?type=getModem_busy',
+        dataType: 'json', // Expecting JSON response
+        method: 'GET',
+        success: function(response) {
+            console.log(response);
+
+            if (response.running) {
+                // Script is running → Show the Bootstrap spinner
+                script_is_running.innerHTML = `
+                    <div class="spinner-border text-danger" role="status">
+                        <span class="visually-hidden">Modem is busy...</span>
+                    </div>
+                `;
+            } else {
+                // Script is NOT running → Show a success message (no spinner)
+                script_is_running.innerHTML = ``;
+            }
+        },
+        error: function(xhr, status, error) {
+            console.error('AJAX request failed:', status, error);
+            script_is_running.innerHTML = `<span class="text-warning">Error checking status ⚠️</span>`;
+        }
+    });
+}
 </script>
 
 </body>
diff --git a/html/saraR4.html b/html/saraR4.html
index f358748..168e774 100755
--- a/html/saraR4.html
+++ b/html/saraR4.html
@@ -51,7 +51,7 @@
       <main class="col-md-10 ms-sm-auto col-lg-11 offset-md-2 offset-lg-1 px-md-4">
         <h1 class="mt-4">Modem 4G</h1>
         <p>Votre capteur est équipé d'un modem 4G et d'une carte SIM afin d'envoyer les mesures sur internet.</p>
-        <p>Verification utilisation du Modem:</p>
+        <span id="modem_status_message"></span>
         <h3>
           Status 
             <span id="modem-status" class="badge">Loading...</span>
@@ -391,211 +391,248 @@ function getData_saraR4(port, command, timeout){
                 });
             }
 
-      function connectNetwork_saraR4(port, networkID, timeout){
-        console.log(" Connect to network (port "+port+" and network id "+networkID+"):");
-        $("#loading_"+port+"_AT_COPS_Connect").show();
-                $.ajax({
-                url: 'launcher.php?type=sara_connectNetwork&port='+port+'&networkID='+encodeURIComponent(networkID)+'&timeout='+timeout,
-                dataType:'text',
-                //dataType: 'json', // Specify that you expect a JSON response
-                method: 'GET', // Use GET or POST depending on your needs
-                success: function(response) {
-                            console.log(response);
-                            $("#loading_"+port+"_AT_COPS_Connect").hide();
-                            // Replace newline characters with <br> tags
-                            const formattedResponse = response.replace(/\n/g, "<br>");
-                            $("#response_"+port+"_AT_COPS_Connect").html(formattedResponse);
+function connectNetwork_saraR4(port, networkID, timeout){
+  console.log(" Connect to network (port "+port+" and network id "+networkID+"):");
+  $("#loading_"+port+"_AT_COPS_Connect").show();
+          $.ajax({
+          url: 'launcher.php?type=sara_connectNetwork&port='+port+'&networkID='+encodeURIComponent(networkID)+'&timeout='+timeout,
+          dataType:'text',
+          //dataType: 'json', // Specify that you expect a JSON response
+          method: 'GET', // Use GET or POST depending on your needs
+          success: function(response) {
+                      console.log(response);
+                      $("#loading_"+port+"_AT_COPS_Connect").hide();
+                      // Replace newline characters with <br> tags
+                      const formattedResponse = response.replace(/\n/g, "<br>");
+                      $("#response_"+port+"_AT_COPS_Connect").html(formattedResponse);
 
-                        },
-                        error: function(xhr, status, error) {
-                            console.error('AJAX request failed:', status, error);
-                        }
-                });
-            }
+                  },
+                  error: function(xhr, status, error) {
+                      console.error('AJAX request failed:', status, error);
+                  }
+          });
+      }
 
-      function mqtt_getConfig_saraR4(port, timeout){
-        console.log("GET MQTT config (port "+port+"):");
-        $("#loading_mqtt_getConfig").show();
-                $.ajax({
-                url: 'launcher.php?type=sara_getMQTT_config&port='+port+'&timeout='+timeout,
-                dataType:'text',
-                //dataType: 'json', // Specify that you expect a JSON response
-                method: 'GET', // Use GET or POST depending on your needs
-                success: function(response) {
-                            console.log(response);
-                            $("#loading_mqtt_getConfig").hide();
-                            // Replace newline characters with <br> tags
-                            const formattedResponse = response.replace(/\n/g, "<br>");
-                            $("#response_mqtt_getConfig").html(formattedResponse);
-                        },
-                        error: function(xhr, status, error) {
-                            console.error('AJAX request failed:', status, error);
-                        }
-                });
-            }
+function mqtt_getConfig_saraR4(port, timeout){
+  console.log("GET MQTT config (port "+port+"):");
+  $("#loading_mqtt_getConfig").show();
+          $.ajax({
+          url: 'launcher.php?type=sara_getMQTT_config&port='+port+'&timeout='+timeout,
+          dataType:'text',
+          //dataType: 'json', // Specify that you expect a JSON response
+          method: 'GET', // Use GET or POST depending on your needs
+          success: function(response) {
+                      console.log(response);
+                      $("#loading_mqtt_getConfig").hide();
+                      // Replace newline characters with <br> tags
+                      const formattedResponse = response.replace(/\n/g, "<br>");
+                      $("#response_mqtt_getConfig").html(formattedResponse);
+                  },
+                  error: function(xhr, status, error) {
+                      console.error('AJAX request failed:', status, error);
+                  }
+          });
+      }
 
-      function mqtt_login_logout(port, login_logout, timeout){
-        console.log("GET MQTT login / logout (port "+port+"):");
-        $("#loading_mqtt_login_logout").show();
-                $.ajax({
-                url: 'launcher.php?type=sara_getMQTT_login_logout&port='+port+'&login_logout='+login_logout+'&timeout='+timeout,
-                dataType:'text',
-                //dataType: 'json', // Specify that you expect a JSON response
-                method: 'GET', // Use GET or POST depending on your needs
-                success: function(response) {
-                            console.log(response);
-                            $("#loading_mqtt_login_logout").hide();
-                            const formattedResponse = response.replace(/\n/g, "<br>");
-                            $("#response_mqtt_login_logout").html(formattedResponse);
+function mqtt_login_logout(port, login_logout, timeout){
+  console.log("GET MQTT login / logout (port "+port+"):");
+  $("#loading_mqtt_login_logout").show();
+          $.ajax({
+          url: 'launcher.php?type=sara_getMQTT_login_logout&port='+port+'&login_logout='+login_logout+'&timeout='+timeout,
+          dataType:'text',
+          //dataType: 'json', // Specify that you expect a JSON response
+          method: 'GET', // Use GET or POST depending on your needs
+          success: function(response) {
+                      console.log(response);
+                      $("#loading_mqtt_login_logout").hide();
+                      const formattedResponse = response.replace(/\n/g, "<br>");
+                      $("#response_mqtt_login_logout").html(formattedResponse);
 
-                            const regex = /^\+UMQTTC:\s*(\d+),(\d+)/m; // Match "+UMQTTC:", followed by two numbers separated by a comma
-                            const match = response.match(regex);
+                      const regex = /^\+UMQTTC:\s*(\d+),(\d+)/m; // Match "+UMQTTC:", followed by two numbers separated by a comma
+                      const match = response.match(regex);
 
-                            if (match) {
-                                const firstNumber = match[1]; // The first number after ":"
-                                const secondNumber = match[2]; // The second number after the ","
-                                if (firstNumber == 0) {
-                                  console.log("MQTT LOGOUT:");
-                                  $("#response_mqtt_login_logout").append("<p>logout</p>");
-                                }
-                                if (firstNumber == 1) {
-                                  console.log("MQTT LOGIN:");
-                                  $("#response_mqtt_login_logout").append("<p>login</p>");
-                                }
-                                if (secondNumber == 0) {
-                                  console.log("ERROR");
-                                  $("#response_mqtt_login_logout").append("<p>error</p>");
-                                }
-                                if (secondNumber == 1) {
-                                  console.log("SUCCESS");
-                                  $("#response_mqtt_login_logout").append("<p>success</p>");
-                                }
+                      if (match) {
+                          const firstNumber = match[1]; // The first number after ":"
+                          const secondNumber = match[2]; // The second number after the ","
+                          if (firstNumber == 0) {
+                            console.log("MQTT LOGOUT:");
+                            $("#response_mqtt_login_logout").append("<p>logout</p>");
+                          }
+                          if (firstNumber == 1) {
+                            console.log("MQTT LOGIN:");
+                            $("#response_mqtt_login_logout").append("<p>login</p>");
+                          }
+                          if (secondNumber == 0) {
+                            console.log("ERROR");
+                            $("#response_mqtt_login_logout").append("<p>error</p>");
+                          }
+                          if (secondNumber == 1) {
+                            console.log("SUCCESS");
+                            $("#response_mqtt_login_logout").append("<p>success</p>");
+                          }
 
-                            } else {
-                                console.log("No matching line found");
-}
-                            
-                        },
-                        error: function(xhr, status, error) {
-                            console.error('AJAX request failed:', status, error);
-                        }
-                });
-            }
+                      } else {
+                          console.log("No matching line found");
+  }
+                      
+                  },
+                  error: function(xhr, status, error) {
+                      console.error('AJAX request failed:', status, error);
+                  }
+          });
+    }
       
-      function mqtt_publish(port, message, timeout){
-        console.log(" MQTT publish (port "+port+"):");
-        $("#loading_mqtt_publish").show();
-                $.ajax({
-                url: 'launcher.php?type=sara_MQTT_publish&port='+port+'&timeout='+timeout+'&message='+message,
-                dataType: 'text',
-                //dataType: 'json', // Specify that you expect a JSON response
-                method: 'GET', // Use GET or POST depending on your needs
-                success: function(response) {
-                            console.log(response);
-                            $("#loading_mqtt_publish").hide();
-                            // Replace newline characters with <br> tags
-                            const formattedResponse = response.replace(/\n/g, "<br>");
-                            $("#response_mqtt_publish").html(formattedResponse);
-                        },
-                        error: function(xhr, status, error) {
-                            console.error('AJAX request failed:', status, error);
-                        }
-                });
-            }
+function mqtt_publish(port, message, timeout){
+  console.log(" MQTT publish (port "+port+"):");
+  $("#loading_mqtt_publish").show();
+          $.ajax({
+          url: 'launcher.php?type=sara_MQTT_publish&port='+port+'&timeout='+timeout+'&message='+message,
+          dataType: 'text',
+          //dataType: 'json', // Specify that you expect a JSON response
+          method: 'GET', // Use GET or POST depending on your needs
+          success: function(response) {
+                      console.log(response);
+                      $("#loading_mqtt_publish").hide();
+                      // Replace newline characters with <br> tags
+                      const formattedResponse = response.replace(/\n/g, "<br>");
+                      $("#response_mqtt_publish").html(formattedResponse);
+                  },
+                  error: function(xhr, status, error) {
+                      console.error('AJAX request failed:', status, error);
+                  }
+          });
+      }
 
-      function setURL_saraR4(port, url){
-        console.log("Set URL for HTTP (port "+port+" and URL "+url+"):");
-        $("#loading_"+port+"_setURL").show();
-                $.ajax({
-                url: 'launcher.php?type=sara_setURL&port='+port+'&url='+encodeURIComponent(url),
-                dataType: 'text',
-                //dataType: 'json', // Specify that you expect a JSON response
-                method: 'GET', // Use GET or POST depending on your needs
-                success: function(response) {
-                            console.log(response);
-                            $("#loading_"+port+"_setURL").hide();
-                            // Replace newline characters with <br> tags
-                            const formattedResponse = response.replace(/\n/g, "<br>");
-                            $("#response_"+port+"_setURL").html(formattedResponse);
-                        },
-                        error: function(xhr, status, error) {
-                            console.error('AJAX request failed:', status, error);
-                        }
-                });
-            }
+function setURL_saraR4(port, url){
+  console.log("Set URL for HTTP (port "+port+" and URL "+url+"):");
+  $("#loading_"+port+"_setURL").show();
+          $.ajax({
+          url: 'launcher.php?type=sara_setURL&port='+port+'&url='+encodeURIComponent(url),
+          dataType: 'text',
+          //dataType: 'json', // Specify that you expect a JSON response
+          method: 'GET', // Use GET or POST depending on your needs
+          success: function(response) {
+                      console.log(response);
+                      $("#loading_"+port+"_setURL").hide();
+                      // Replace newline characters with <br> tags
+                      const formattedResponse = response.replace(/\n/g, "<br>");
+                      $("#response_"+port+"_setURL").html(formattedResponse);
+                  },
+                  error: function(xhr, status, error) {
+                      console.error('AJAX request failed:', status, error);
+                  }
+          });
+      }
 
-      function writeMessage_saraR4(port, message, type){
-        console.log(type +" message to SARA R4 memory (port "+port+" and message "+message+"):");
-        $("#loading_"+port+"_message_write").show();
-                $.ajax({
-                url: 'launcher.php?type=sara_writeMessage&port='+port+'&message='+encodeURIComponent(message)+'&type2='+type,
-                dataType: 'text',
-                //dataType: 'json', // Specify that you expect a JSON response
-                method: 'GET', // Use GET or POST depending on your needs
-                success: function(response) {
-                            console.log(response);
-                            $("#loading_"+port+"_message_write").hide();
-                            // Replace newline characters with <br> tags
-                            const formattedResponse = response.replace(/\n/g, "<br>");
-                            $("#response_"+port+"_message_write").html(formattedResponse);
-                        },
-                        error: function(xhr, status, error) {
-                            console.error('AJAX request failed:', status, error);
-                        }
-                });
-            }
+function writeMessage_saraR4(port, message, type){
+  console.log(type +" message to SARA R4 memory (port "+port+" and message "+message+"):");
+  $("#loading_"+port+"_message_write").show();
+          $.ajax({
+          url: 'launcher.php?type=sara_writeMessage&port='+port+'&message='+encodeURIComponent(message)+'&type2='+type,
+          dataType: 'text',
+          //dataType: 'json', // Specify that you expect a JSON response
+          method: 'GET', // Use GET or POST depending on your needs
+          success: function(response) {
+                      console.log(response);
+                      $("#loading_"+port+"_message_write").hide();
+                      // Replace newline characters with <br> tags
+                      const formattedResponse = response.replace(/\n/g, "<br>");
+                      $("#response_"+port+"_message_write").html(formattedResponse);
+                  },
+                  error: function(xhr, status, error) {
+                      console.error('AJAX request failed:', status, error);
+                  }
+          });
+      }
 
-      function sendMessage_saraR4(port, endpoint){
-        
-        console.log("Send message from SaraR4 (port "+port+" and endpoint "+endpoint+"):");
+function sendMessage_saraR4(port, endpoint){
+  
+  console.log("Send message from SaraR4 (port "+port+" and endpoint "+endpoint+"):");
 
-        $("#loading_"+port+"_message_send").show();
+  $("#loading_"+port+"_message_send").show();
 
-              $.ajax({
-                url: 'launcher.php?type=sara_sendMessage&port='+port+'&endpoint='+encodeURIComponent(endpoint),
-                dataType: 'text',
-                //dataType: 'json', // Specify that you expect a JSON response
-                method: 'GET', // Use GET or POST depending on your needs
-                success: function(response) {
-                            console.log(response);
-                            $("#loading_"+port+"_message_send").hide();
-                            // Replace newline characters with <br> tags
-                            const formattedResponse = response.replace(/\n/g, "<br>");
-                            $("#response_"+port+"_message_send").html(formattedResponse);
-                        },
-                        error: function(xhr, status, error) {
-                            console.error('AJAX request failed:', status, error);
-                        }
-                });
-            }
-
-      function connectAPN_saraR4(port, APN_address, timeout){
-        
-        console.log(" Set APN (port "+port+" and adress "+APN_address+"):");
-
-        $("#loading_"+port+"_APN").show();
-        
         $.ajax({
-                url: 'launcher.php?type=sara_APN&port='+port+'&APN_address='+encodeURIComponent(APN_address)+'&timeout='+timeout,
-                //dataType: 'json', // Specify that you expect a JSON response
-                dataType: 'text',
-                method: 'GET', // Use GET or POST depending on your needs
-                success: function(response) {
-                            console.log(response);
-                            $("#loading_"+port+"_APN").hide();
-                            // Replace newline characters with <br> tags
-                            const formattedResponse = response.replace(/\n/g, "<br>");
-                            $("#response_"+port+"_APN").html(formattedResponse);
+          url: 'launcher.php?type=sara_sendMessage&port='+port+'&endpoint='+encodeURIComponent(endpoint),
+          dataType: 'text',
+          //dataType: 'json', // Specify that you expect a JSON response
+          method: 'GET', // Use GET or POST depending on your needs
+          success: function(response) {
+                      console.log(response);
+                      $("#loading_"+port+"_message_send").hide();
+                      // Replace newline characters with <br> tags
+                      const formattedResponse = response.replace(/\n/g, "<br>");
+                      $("#response_"+port+"_message_send").html(formattedResponse);
+                  },
+                  error: function(xhr, status, error) {
+                      console.error('AJAX request failed:', status, error);
+                  }
+          });
+      }
 
-                        },
-                        error: function(xhr, status, error) {
-                            console.error('AJAX request failed:', status, error);
-                        }
-                });
+function connectAPN_saraR4(port, APN_address, timeout){
+  
+  console.log(" Set APN (port "+port+" and adress "+APN_address+"):");
+
+  $("#loading_"+port+"_APN").show();
+  
+  $.ajax({
+          url: 'launcher.php?type=sara_APN&port='+port+'&APN_address='+encodeURIComponent(APN_address)+'&timeout='+timeout,
+          //dataType: 'json', // Specify that you expect a JSON response
+          dataType: 'text',
+          method: 'GET', // Use GET or POST depending on your needs
+          success: function(response) {
+                      console.log(response);
+                      $("#loading_"+port+"_APN").hide();
+                      // Replace newline characters with <br> tags
+                      const formattedResponse = response.replace(/\n/g, "<br>");
+                      $("#response_"+port+"_APN").html(formattedResponse);
+
+                  },
+                  error: function(xhr, status, error) {
+                      console.error('AJAX request failed:', status, error);
+                  }
+          });
+}
+
+function getModem_busy_status() {
+    console.log("Getting modem busy status");
+
+    const SARA_busy_message = document.getElementById("modem_status_message");
+
+    $.ajax({
+        url: 'launcher.php?type=getModem_busy',
+        dataType: 'json', // Expecting JSON response
+        method: 'GET',
+        success: function(response) {
+            console.log(response);
+
+            if (response.running) {
+                // Script is running → Red button, "Modem is busy"
+
+                SARA_busy_message.innerHTML= ` <div class="alert alert-warning" role="alert">
+                  Le modem 4G est en cours d'utilisation. L'utilisation des boutons ci-dessous peut entrainer des erreurs. Veuillez désactiver le modem avant de continuer.
+                </div>`
+            } else {
+                // Script is NOT running → Green button, "Modem is available"
+
+                SARA_busy_message.innerHTML= ` <div class="alert alert-primary" role="alert">
+                  Le modem 4G est disponible.
+                </div>`
             }
+        },
+        error: function(xhr, status, error) {
+            console.error('AJAX request failed:', status, error);
+            SARA_busy_status.textContent = "Error checking status";
+            SARA_busy_status.className = "btn text-bg-warning"; // Yellow button for errors
+        }
+    });
+}
 
 
 window.onload = function() {
+  getModem_busy_status();
+  setInterval(getModem_busy_status, 1000);
+
     fetch('../config.json') // Replace 'deviceID.txt' with 'config.json'
         .then(response => response.json()) // Parse response as JSON
         .then(data => {