fix

central-ejb/src/main/java/uy/edu/fing/tse/central/business/BusinessBean.java

@@ -72,7 +72,21 @@ public class BusinessBean implements BusinessLocal, BusinessRemote {
 
     @Override
     public void altaPeriferico(Peripherical p) {
+        Mechanism peripherical = null;
+        try {
+            peripherical = mecanismos.find(p.getName());
+        } catch (Exception e) {
+        }
+        if (peripherical == null) {
             mecanismos.create(p);
+        } else {
+            if (peripherical instanceof Peripherical) {
+                p.setId(peripherical.getId());
+                mecanismos.update(p);
+            } else {
+                throw new RuntimeException("Periferico ya registrado con ese nombre");
+            }
+        }
     }
 
     @Override