diff --git a/tprais_semestralka1/src/bin/main.rs b/tprais_semestralka1/src/bin/main.rs
index 1ce5d5b..6d44c70 100644
--- a/tprais_semestralka1/src/bin/main.rs
+++ b/tprais_semestralka1/src/bin/main.rs
@@ -7,6 +7,7 @@
     reason = "mem::forget is generally not safe to do with esp_hal types"
 )]
 
+use defmt::error;
 use embassy_executor::Spawner;
 use embassy_futures::select::{select, Either};
 use embassy_net::{Runner, StackResources};
@@ -78,10 +79,30 @@ async fn main(spawner: Spawner) -> ! {
         .into_async();
 
     let mut buffer = [0u8; 1];
-    let SAD = 0x5C;
-    let SUB = &[0x0F];
-    i2c.write_read_async(SAD, SUB, &mut buffer).await.unwrap();
-    info!("WHO_AM_I: {:x}", buffer[0]);
+    let mut devices_count = 0;
+
+    info!("Starting I2C bus scan...");
+
+    for addr in 0x08..=0x77 {
+        match i2c.write_read_async(addr, &[0x0F], &mut buffer).await {
+            Ok(_) => {
+                info!(
+                    "Found device at address: 0x{:02X} (WHO_AM_I: 0x{:02X})",
+                    addr, buffer[0]
+                );
+                devices_count += 1;
+            }
+            Err(_) => {
+                // No device responded at this address, continue silently
+            }
+        }
+    }
+
+    if devices_count == 0 {
+        info!("Scan complete: No devices found.");
+    } else {
+        info!("Scan complete: {} device(s) found.", devices_count);
+    }
 
     info!("Initializing WiFi...");
     let timg0 = TimerGroup::new(peripherals.TIMG0);
@@ -123,11 +144,12 @@ async fn main(spawner: Spawner) -> ! {
     NETWORK_READY.wait().await;
     info!("Network ready");
 
-    mqtt_publish("esp32/post", b"online", QualityOfService::QoS1, false).await;
+    // mqtt_publish("esp32/post", b"online", QualityOfService::QoS1, false).await;
+    // mqtt_publish("esp32/post", &whoami, QualityOfService::QoS1, false).await;
 
     loop {
         Timer::after(Duration::from_secs(10)).await;
-        mqtt_publish("esp32/post", b"abba", QualityOfService::QoS1, false).await;
+        mqtt_publish("esp32/post", b"aaaa", QualityOfService::QoS1, false).await;
     }
 }