diff --git a/SARA/sara_ping_miotiq.py b/SARA/sara_ping_miotiq.py
index 10c21d2..d5f7605 100644
--- a/SARA/sara_ping_miotiq.py
+++ b/SARA/sara_ping_miotiq.py
@@ -24,7 +24,7 @@ import sqlite3
 MIOTIQ_IP = "192.168.0.20"
 MIOTIQ_PORT = 4242
 PAYLOAD_SIZE = 100
-COMMAND_PING = 0x01
+COMMAND_PING = 0x02
 LISTEN_TIMEOUT = 15  # seconds to wait for downlink response
 
 # --- Load device_id from SQLite ---
diff --git a/html/saraR4.html b/html/saraR4.html
index 527fbc4..ee1a14f 100755
--- a/html/saraR4.html
+++ b/html/saraR4.html
@@ -334,7 +334,7 @@
           <div class="card">
             <div class="card-body">
               <p class="card-text"><strong>3. Test aller-retour</strong></p>
-              <p class="text-muted small mb-2">Envoie un payload ping (command=1) via UDP puis écoute la réponse descendante Miotiq (~15s).</p>
+              <p class="text-muted small mb-2">Envoie un payload ping (command=2) via UDP puis écoute la réponse descendante Miotiq (~15s).</p>
               <button class="btn btn-primary" onclick="pingMiotiq()">Ping Miotiq</button>
               <div id="loading_ping_miotiq" class="spinner-border spinner-border-sm" style="display: none;" role="status"></div>
               <div id="response_ping_miotiq"></div>
diff --git a/loop/SARA_send_data_v2.py b/loop/SARA_send_data_v2.py
index d5ffa0c..9bc1b53 100755
--- a/loop/SARA_send_data_v2.py
+++ b/loop/SARA_send_data_v2.py
@@ -387,7 +387,7 @@ class SensorPayload:
         self.payload[68] = status & 0xFF
 
     def set_command(self, value):
-        """Set command byte (byte 9): 0x00 = normal data, 0x01 = ping test"""
+        """Set command byte (byte 9): 0x00 = normal data, 0x01 = legacy (ancien protocol_version), 0x02 = ping test"""
         self.payload[9] = value & 0xFF
 
     def set_firmware_version(self, version_str):
diff --git a/loop/error_flags.md b/loop/error_flags.md
index 5c7c6e1..7197577 100644
--- a/loop/error_flags.md
+++ b/loop/error_flags.md
@@ -13,7 +13,7 @@ etre actifs simultanement.
 ## Position dans la payload
 
 ```
-Byte  9     : command (0x00 = data normal, 0x01 = ping test)
+Byte  9     : command (0x00 = data normal, 0x01 = legacy/ancien protocol_version, 0x02 = ping test)
 Bytes 0-8   : device_id (8 bytes) + signal_quality (1 byte)
 Bytes 10-65 : donnees capteurs
 Byte  66    : error_flags (erreurs systeme)