feat: Implement command acknowledgment and improve command polling reliability for turtles

server/server.js

@@ -254,10 +254,20 @@ app.get('/api/turtle/:id/commands', (req, res) => {
         commands.forEach(cmd => console.log(`   - ${cmd.command}`, cmd.param ? `(${cmd.param})` : ''));
       }
       
-      // Clear pending commands
-      turtle.pendingCommands = [];
-      
-      res.json({ commands });
+      // Mark commands as sent but don't clear them yet - they'll be cleared on next poll if turtle is processing
+      // This allows the webbridge to retry if the turtle didn't receive them
+      if (!turtle.lastCommandPollTime || (Date.now() - turtle.lastCommandPollTime) > 5000) {
+        // First poll or more than 5 seconds since last poll - send commands
+        turtle.lastCommandPollTime = Date.now();
+        res.json({ commands });
+      } else {
+        // Recent poll - assume previous commands were received, clear them
+        if (commands.length > 0) {
+          console.log(`✅ Clearing ${commands.length} command(s) for turtle ${turtleID} (acknowledged)`);
+          turtle.pendingCommands = [];
+        }
+        res.json({ commands: [] });
+      }
     } else {
       res.json({ commands: [] });
     }
@@ -267,6 +277,30 @@ app.get('/api/turtle/:id/commands', (req, res) => {
   }
 });
 
+// Acknowledge commands were delivered (clears them)
+app.post('/api/turtle/:id/commands/ack', (req, res) => {
+  try {
+    const turtleID = parseInt(req.params.id);
+    
+    if (turtleData.has(turtleID)) {
+      const turtle = turtleData.get(turtleID);
+      const clearedCount = (turtle.pendingCommands || []).length;
+      
+      if (clearedCount > 0) {
+        console.log(`✅ Turtle ${turtleID} acknowledged ${clearedCount} command(s)`);
+        turtle.pendingCommands = [];
+      }
+      
+      res.json({ success: true, cleared: clearedCount });
+    } else {
+      res.status(404).json({ error: 'Turtle not found' });
+    }
+  } catch (error) {
+    console.error('❌ Error acknowledging commands:', error);
+    res.status(500).json({ error: error.message });
+  }
+});
+
 // Get all turtles
 app.get('/api/turtles', (req, res) => {
   res.json({