diff --git a/receiver/src/comm.rs b/receiver/src/comm.rs
index 32b3347..00ff9a9 100644
--- a/receiver/src/comm.rs
+++ b/receiver/src/comm.rs
@@ -25,6 +25,7 @@ pub struct Comm {
     handler: TimeCallback,
     crypto: Crypto,
     topic: String,
+    last_uuids: RefCell<Vec<uuid::Uuid>>
 }
 
 impl Comm {
@@ -36,9 +37,11 @@ impl Comm {
         let mut create_opts =
             mqtt::MqttOptions::new(uuid::Uuid::new_v4().to_string(), broker_domain, 8883);
         create_opts.set_keep_alive(Duration::from_secs(5));
+
         let transport = mqtt::Transport::Tls(mqtt::TlsConfiguration::default());
         create_opts.set_transport(transport);
-        let (mut cli, conn) = mqtt::Client::new(create_opts, 10);
+        
+            let (mut cli, conn) = mqtt::Client::new(create_opts, 10);
 
         let crypto = Crypto::new(password, broker_domain);
 
@@ -53,6 +56,7 @@ impl Comm {
             handler,
             crypto,
             topic,
+            last_uuids: RefCell::new(Vec::new())
         })
     }
 
@@ -95,6 +99,12 @@ impl Comm {
             return;
         }
 
+        if self.last_uuids.borrow().contains(&msg.id) {
+            return;
+        }
+
+        self.last_uuids.borrow_mut().push(msg.id);
+
         if (self.handler)(msg.time).is_err() {
             println!("[WARN] error in time handler -> not sending confirmation");
             return;