diff --git a/main/src/gatt_svc.c b/main/src/gatt_svc.c
index bca977d..047a3a4 100644
--- a/main/src/gatt_svc.c
+++ b/main/src/gatt_svc.c
@@ -5,22 +5,22 @@
 #include "led.h"
 
 /* Private function declarations */
-static int heart_rate_chr_access(uint16_t conn_handle, uint16_t attr_handle,
+static int temp_chr_access(uint16_t conn_handle, uint16_t attr_handle,
                                  struct ble_gatt_access_ctxt *ctxt, void *arg);
 static int led_chr_access(uint16_t conn_handle, uint16_t attr_handle,
                           struct ble_gatt_access_ctxt *ctxt, void *arg);
 
 /* Private variables */
-/* Heart rate service */
-static const ble_uuid16_t heart_rate_svc_uuid = BLE_UUID16_INIT(0x180D);
+/* temp rate service */
+static const ble_uuid16_t temp_svc_uuid = BLE_UUID16_INIT(0x180D);
 
-static uint8_t heart_rate_chr_val[2] = {0};
-static uint16_t heart_rate_chr_val_handle;
-static const ble_uuid16_t heart_rate_chr_uuid = BLE_UUID16_INIT(0x2A37);
+static uint8_t temp_chr_val[2] = {0};
+static uint16_t temp_chr_val_handle;
+static const ble_uuid16_t temp_chr_uuid = BLE_UUID16_INIT(0x2A37);
 
-static uint16_t heart_rate_chr_conn_handle = 0;
-static bool heart_rate_chr_conn_handle_inited = false;
-static bool heart_rate_ind_status = false;
+static uint16_t temp_chr_conn_handle = 0;
+static bool temp_chr_conn_handle_inited = false;
+static bool temp_ind_status = false;
 
 /* Automation IO service */
 static const ble_uuid16_t auto_io_svc_uuid = BLE_UUID16_INIT(0x1815);
@@ -31,16 +31,16 @@ static const ble_uuid128_t led_chr_uuid =
 
 /* GATT services table */
 static const struct ble_gatt_svc_def gatt_svr_svcs[] = {
-    /* Heart rate service */
+    /* Temp rate service */
     {.type = BLE_GATT_SVC_TYPE_PRIMARY,
-     .uuid = &heart_rate_svc_uuid.u,
+     .uuid = &temp_svc_uuid.u,
      .characteristics =
          (struct ble_gatt_chr_def[]){
-             {/* Heart rate characteristic */
-              .uuid = &heart_rate_chr_uuid.u,
-              .access_cb = heart_rate_chr_access,
+             {/* Temp rate characteristic */
+              .uuid = &temp_chr_uuid.u,
+              .access_cb = temp_chr_access,
               .flags = BLE_GATT_CHR_F_READ | BLE_GATT_CHR_F_INDICATE,
-              .val_handle = &heart_rate_chr_val_handle},
+              .val_handle = &temp_chr_val_handle},
              {
                  0, /* No more characteristics in this service. */
              }}},
@@ -64,13 +64,13 @@ static const struct ble_gatt_svc_def gatt_svr_svcs[] = {
 };
 
 /* Private functions */
-static int heart_rate_chr_access(uint16_t conn_handle, uint16_t attr_handle,
+static int temp_chr_access(uint16_t conn_handle, uint16_t attr_handle,
                                  struct ble_gatt_access_ctxt *ctxt, void *arg) {
     /* Local variables */
     int rc;
 
     /* Handle access events */
-    /* Note: Heart rate characteristic is read only */
+    /* Note: Temp rate characteristic is read only */
     switch (ctxt->op) {
 
     /* Read characteristic event */
@@ -85,11 +85,11 @@ static int heart_rate_chr_access(uint16_t conn_handle, uint16_t attr_handle,
         }
 
         /* Verify attribute handle */
-        if (attr_handle == heart_rate_chr_val_handle) {
+        if (attr_handle == temp_chr_val_handle) {
             /* Update access buffer value */
-            heart_rate_chr_val[1] = get_temp();
-            rc = os_mbuf_append(ctxt->om, &heart_rate_chr_val,
-                                sizeof(heart_rate_chr_val));
+            temp_chr_val[1] = get_temp();
+            rc = os_mbuf_append(ctxt->om, &temp_chr_val,
+                                sizeof(temp_chr_val));
             return rc == 0 ? 0 : BLE_ATT_ERR_INSUFFICIENT_RES;
         }
         goto error;
@@ -102,7 +102,7 @@ static int heart_rate_chr_access(uint16_t conn_handle, uint16_t attr_handle,
 error:
     ESP_LOGE(
         TAG,
-        "unexpected access operation to heart rate characteristic, opcode: %d",
+        "unexpected access operation to temp rate characteristic, opcode: %d",
         ctxt->op);
     return BLE_ATT_ERR_UNLIKELY;
 }
@@ -161,9 +161,9 @@ error:
 
 /* Public functions */
 void send_heart_rate_indication(void) {
-    if (heart_rate_ind_status && heart_rate_chr_conn_handle_inited) {
-        ble_gatts_indicate(heart_rate_chr_conn_handle,
-                           heart_rate_chr_val_handle);
+    if (temp_ind_status && temp_chr_conn_handle_inited) {
+        ble_gatts_indicate(temp_chr_conn_handle,
+                           temp_chr_val_handle);
         ESP_LOGI(TAG, "heart rate indication sent!");
     }
 }
@@ -213,7 +213,7 @@ void gatt_svr_register_cb(struct ble_gatt_register_ctxt *ctxt, void *arg) {
 
 /*
  *  GATT server subscribe event callback
- *      1. Update heart rate subscription status
+ *      1. Update temp rate subscription status
  */
 
 void gatt_svr_subscribe_cb(struct ble_gap_event *event) {
@@ -227,11 +227,11 @@ void gatt_svr_subscribe_cb(struct ble_gap_event *event) {
     }
 
     /* Check attribute handle */
-    if (event->subscribe.attr_handle == heart_rate_chr_val_handle) {
-        /* Update heart rate subscription status */
-        heart_rate_chr_conn_handle = event->subscribe.conn_handle;
-        heart_rate_chr_conn_handle_inited = true;
-        heart_rate_ind_status = event->subscribe.cur_indicate;
+    if (event->subscribe.attr_handle == temp_chr_val_handle) {
+        /* Update temp rate subscription status */
+        temp_chr_conn_handle = event->subscribe.conn_handle;
+        temp_chr_conn_handle_inited = true;
+        temp_ind_status = event->subscribe.cur_indicate;
     }
 }