diff --git a/gpio.c b/gpio.c
index 77a6454..25d698c 100644
--- a/gpio.c
+++ b/gpio.c
@@ -8,7 +8,7 @@
 #define LED_BLINK_SLOW 1000     // Warning blink interval (ms)
 #define LED_BLINK_FAST 500      // Error blink interval (ms)
 #define LED_BREATH_PERIOD 2000  // Breathing effect period (ms)
-#define STATE_STABILITY 500    // Minimum time before state change (ms)
+#define STATE_STABILITY 500     // Minimum time before state change (ms)
 
 #define LED_G (1 << 4)
 #define LED_B (1 << 3)
diff --git a/onewire_temp.c b/onewire_temp.c
index 255f1ca..0501eb7 100644
--- a/onewire_temp.c
+++ b/onewire_temp.c
@@ -94,7 +94,7 @@ static float convert_temperature(const uint8_t* data, uint8_t family_code) {
 }
 
 static bool start_conversion(onewire_sensor_t* sensor) {
-  if (!sensor->state != ONEWIRE_STATE_READY) {
+  if (!sensor->valid || !sensor->state != ONEWIRE_STATE_READY) {
     return false;
   }
 
@@ -148,7 +148,9 @@ void onewire_temp_process(void) {
             sensor->error_count++;
             if (sensor->error_count >= ONEWIRE_MAX_RETRIES) {
               sensor->valid = false;
-              DEBUG_PRINT("sensor %d marked temporarily invalid after %d retries\n", i, ONEWIRE_MAX_RETRIES);
+              DEBUG_PRINT(
+                  "sensor %d marked temporarily invalid after %d retries\n", i,
+                  ONEWIRE_MAX_RETRIES);
             }
           }
         }
@@ -165,7 +167,9 @@ void onewire_temp_process(void) {
           sensor->error_count++;
           if (sensor->error_count >= ONEWIRE_MAX_RETRIES) {
             sensor->valid = false;
-            DEBUG_PRINT("sensor %d marked temporarily invalid after %d retries\n", i, ONEWIRE_MAX_RETRIES);
+            DEBUG_PRINT(
+                "sensor %d marked temporarily invalid after %d retries\n", i,
+                ONEWIRE_MAX_RETRIES);
           }
         } else {
           sensor->valid = true;  // re-enable
@@ -214,104 +218,113 @@ void onewire_temp_set_parallel(bool enable) { ow_sys.parallel_mode = enable; }
 
 // MQTT
 void onewire_temp_publish_discovery(MQTTClient* client, const char* node_id) {
-    char topic[MAX_TOPIC_LENGTH];
-    char sensor_name[32];
-    uint8_t sensor_count = onewire_temp_count();
-    
-    // append to node list
-    size_t current_len = strlen(nodes_list);
-    char* ptr = nodes_list + current_len;
-    size_t remaining = sizeof(nodes_list) - current_len;
-    
-    for (uint8_t i = 0; i < sensor_count && remaining > 1; i++) {
-        if (!onewire_temp_valid(i)) {
-            continue;
-        }
+  char topic[MAX_TOPIC_LENGTH];
+  char sensor_name[32];
+  uint8_t sensor_count = onewire_temp_count();
 
-        // , if not 1st
-        if (current_len > 0 && remaining > 1) {
-            *ptr++ = ',';
-            remaining--;
-            current_len++;
-        }
+  // append to node list
+  size_t current_len = strlen(nodes_list);
+  char* ptr = nodes_list + current_len;
+  size_t remaining = sizeof(nodes_list) - current_len;
 
-        const uint8_t* addr = onewire_temp_address(i);
-        int written = snprintf(sensor_name, sizeof(sensor_name),
-                          "temp_%02x%02x%02x%02x%02x%02x%02x%02x",
-                          addr[0], addr[1], addr[2], addr[3],
-                          addr[4], addr[5], addr[6], addr[7]);
-                          
-        if (written < 0 || (size_t)written >= remaining) {
-            break;
-        }
-        
-        memcpy(ptr, sensor_name, written);
-        ptr += written;
-        remaining -= written;
-        current_len += written;
+  for (uint8_t i = 0; i < sensor_count && remaining > 1; i++) {
+    if (!onewire_temp_valid(i)) {
+      continue;
     }
-    *ptr = '\0';
 
-    // pub node list
-    snprintf(topic, sizeof(topic), "homie/%s/$nodes", node_id);
-    publish_retained(client, topic, nodes_list);
+    // , if not 1st
+    if (current_len > 0 && remaining > 1) {
+      *ptr++ = ',';
+      remaining--;
+      current_len++;
+    }
 
-    for (uint8_t i = 0; i < sensor_count; i++) {
-        if (!onewire_temp_valid(i)) {
-            continue;
-        }
-
-        const uint8_t* addr = onewire_temp_address(i);
+    const uint8_t* addr = onewire_temp_address(i);
+    int written =
         snprintf(sensor_name, sizeof(sensor_name),
-                 "temp_%02x%02x%02x%02x%02x%02x%02x%02x",
-                 addr[0], addr[1], addr[2], addr[3],
-                 addr[4], addr[5], addr[6], addr[7]);
+                 "temp_%02x%02x%02x%02x%02x%02x%02x%02x", addr[0], addr[1],
+                 addr[2], addr[3], addr[4], addr[5], addr[6], addr[7]);
 
-        snprintf(topic, sizeof(topic), "homie/%s/%s/$name", node_id, sensor_name);
-        char display_name[48];
-        snprintf(display_name, sizeof(display_name),
-                 "Temperature Sensor %02X:%02X:%02X:%02X:%02X:%02X:%02X:%02X",
-                 addr[0], addr[1], addr[2], addr[3],
-                 addr[4], addr[5], addr[6], addr[7]);
-        publish_retained(client, topic, display_name);
-
-        snprintf(topic, sizeof(topic), "homie/%s/%s/$properties", node_id, sensor_name);
-        publish_retained(client, topic, "temperature,address,status,error_count");
-
-        // temperature properties
-        snprintf(topic, sizeof(topic), "homie/%s/%s/temperature/$name", node_id, sensor_name);
-        publish_retained(client, topic, "Temperature");
-        snprintf(topic, sizeof(topic), "homie/%s/%s/temperature/$datatype", node_id, sensor_name);
-        publish_retained(client, topic, "float");
-        snprintf(topic, sizeof(topic), "homie/%s/%s/temperature/$unit", node_id, sensor_name);
-        publish_retained(client, topic, "°C");
-
-        // address properties
-        snprintf(topic, sizeof(topic), "homie/%s/%s/address/$name", node_id, sensor_name);
-        publish_retained(client, topic, "ROM Address");
-        snprintf(topic, sizeof(topic), "homie/%s/%s/address/$datatype", node_id, sensor_name);
-        publish_retained(client, topic, "string");
-
-        char addr_str[24];
-        snprintf(addr_str, sizeof(addr_str),
-                 "%02X:%02X:%02X:%02X:%02X:%02X:%02X:%02X",
-                 addr[0], addr[1], addr[2], addr[3],
-                 addr[4], addr[5], addr[6], addr[7]);
-        snprintf(topic, sizeof(topic), "homie/%s/%s/address", node_id, sensor_name);
-        publish_retained(client, topic, addr_str);
-
-        snprintf(topic, sizeof(topic), "homie/%s/%s/status/$name", node_id, sensor_name);
-        publish_retained(client, topic, "Sensor Status");
-        snprintf(topic, sizeof(topic), "homie/%s/%s/status/$datatype", node_id, sensor_name);
-        publish_retained(client, topic, "enum");
-        snprintf(topic, sizeof(topic), "homie/%s/%s/status/$format", node_id, sensor_name);
-        publish_retained(client, topic, "valid,invalid");
-
-        snprintf(topic, sizeof(topic), "homie/%s/%s/error_count/$name", node_id, sensor_name);
-        publish_retained(client, topic, "Error Count");
-        snprintf(topic, sizeof(topic), "homie/%s/%s/error_count/$datatype", node_id, sensor_name);
-        publish_retained(client, topic, "integer");
+    if (written < 0 || (size_t)written >= remaining) {
+      break;
     }
+
+    memcpy(ptr, sensor_name, written);
+    ptr += written;
+    remaining -= written;
+    current_len += written;
+  }
+  *ptr = '\0';
+
+  // pub node list
+  snprintf(topic, sizeof(topic), "homie/%s/$nodes", node_id);
+  publish_retained(client, topic, nodes_list);
+
+  for (uint8_t i = 0; i < sensor_count; i++) {
+    if (!onewire_temp_valid(i)) {
+      continue;
+    }
+
+    const uint8_t* addr = onewire_temp_address(i);
+    snprintf(sensor_name, sizeof(sensor_name),
+             "temp_%02x%02x%02x%02x%02x%02x%02x%02x", addr[0], addr[1], addr[2],
+             addr[3], addr[4], addr[5], addr[6], addr[7]);
+
+    snprintf(topic, sizeof(topic), "homie/%s/%s/$name", node_id, sensor_name);
+    char display_name[48];
+    snprintf(display_name, sizeof(display_name),
+             "Temperature Sensor %02X:%02X:%02X:%02X:%02X:%02X:%02X:%02X",
+             addr[0], addr[1], addr[2], addr[3], addr[4], addr[5], addr[6],
+             addr[7]);
+    publish_retained(client, topic, display_name);
+
+    snprintf(topic, sizeof(topic), "homie/%s/%s/$properties", node_id,
+             sensor_name);
+    publish_retained(client, topic, "temperature,address,status,error_count");
+
+    // temperature properties
+    snprintf(topic, sizeof(topic), "homie/%s/%s/temperature/$name", node_id,
+             sensor_name);
+    publish_retained(client, topic, "Temperature");
+    snprintf(topic, sizeof(topic), "homie/%s/%s/temperature/$datatype", node_id,
+             sensor_name);
+    publish_retained(client, topic, "float");
+    snprintf(topic, sizeof(topic), "homie/%s/%s/temperature/$unit", node_id,
+             sensor_name);
+    publish_retained(client, topic, "°C");
+
+    // address properties
+    snprintf(topic, sizeof(topic), "homie/%s/%s/address/$name", node_id,
+             sensor_name);
+    publish_retained(client, topic, "ROM Address");
+    snprintf(topic, sizeof(topic), "homie/%s/%s/address/$datatype", node_id,
+             sensor_name);
+    publish_retained(client, topic, "string");
+
+    char addr_str[24];
+    snprintf(addr_str, sizeof(addr_str),
+             "%02X:%02X:%02X:%02X:%02X:%02X:%02X:%02X", addr[0], addr[1],
+             addr[2], addr[3], addr[4], addr[5], addr[6], addr[7]);
+    snprintf(topic, sizeof(topic), "homie/%s/%s/address", node_id, sensor_name);
+    publish_retained(client, topic, addr_str);
+
+    snprintf(topic, sizeof(topic), "homie/%s/%s/status/$name", node_id,
+             sensor_name);
+    publish_retained(client, topic, "Sensor Status");
+    snprintf(topic, sizeof(topic), "homie/%s/%s/status/$datatype", node_id,
+             sensor_name);
+    publish_retained(client, topic, "enum");
+    snprintf(topic, sizeof(topic), "homie/%s/%s/status/$format", node_id,
+             sensor_name);
+    publish_retained(client, topic, "valid,invalid");
+
+    snprintf(topic, sizeof(topic), "homie/%s/%s/error_count/$name", node_id,
+             sensor_name);
+    publish_retained(client, topic, "Error Count");
+    snprintf(topic, sizeof(topic), "homie/%s/%s/error_count/$datatype", node_id,
+             sensor_name);
+    publish_retained(client, topic, "integer");
+  }
 }
 
 // MQTT
@@ -326,9 +339,8 @@ void onewire_temp_publish_values(MQTTClient* client, const char* node_id) {
 
     char base_topic[MAX_TOPIC_LENGTH];
     snprintf(base_topic, sizeof(base_topic),
-             "homie/%s/temp_%02x%02x%02x%02x%02x%02x%02x%02x",
-             node_id, addr[0], addr[1], addr[2], addr[3], 
-             addr[4], addr[5], addr[6], addr[7]);
+             "homie/%s/temp_%02x%02x%02x%02x%02x%02x%02x%02x", node_id, addr[0],
+             addr[1], addr[2], addr[3], addr[4], addr[5], addr[6], addr[7]);
 
     // publish status
     snprintf(topic, sizeof(topic), "%s/status", base_topic);