diff --git a/src/server/ble_characteristic.rs b/src/server/ble_characteristic.rs
index 7d30a67..f7f6c82 100644
--- a/src/server/ble_characteristic.rs
+++ b/src/server/ble_characteristic.rs
@@ -251,7 +251,7 @@ impl BLECharacteristic {
 
   pub fn notify(&self) {
     for it in &self.subscribed_list {
-      if let Err(err) = self.send_value(self.value.value(), it.0, it.1) {
+      if let Err(err) = self.send_value(self.value.as_slice(), it.0, it.1) {
         ::log::warn!("notify error({}): {:?}", it.0, err);
       }
     }
@@ -330,7 +330,7 @@ impl BLECharacteristic {
         }
 
         ble_npl_hw_enter_critical();
-        let value = characteristic.value.value();
+        let value = characteristic.value.as_slice();
         let rc = os_mbuf_append(ctxt.om, value);
         ble_npl_hw_exit_critical();
         if rc == 0 {
@@ -355,7 +355,7 @@ impl BLECharacteristic {
           if let Some(callback) = &mut (*characteristic.get()).on_write {
             let desc = crate::utilities::ble_gap_conn_find(conn_handle).unwrap();
             let mut arg = OnWriteArgs {
-              current_data: (*characteristic.get()).value.value(),
+              current_data: (*characteristic.get()).value.as_slice(),
               recv_data: &buf,
               desc: &desc,
               reject: false,
diff --git a/src/server/ble_descriptor.rs b/src/server/ble_descriptor.rs
index 926b304..b2674c2 100644
--- a/src/server/ble_descriptor.rs
+++ b/src/server/ble_descriptor.rs
@@ -108,7 +108,7 @@ impl BLEDescriptor {
         }
 
         ble_npl_hw_enter_critical();
-        let value = descriptor.value.value();
+        let value = descriptor.value.as_slice();
         let rc = os_mbuf_append(ctxt.om, value);
         ble_npl_hw_exit_critical();
         if rc == 0 {
@@ -131,7 +131,7 @@ impl BLEDescriptor {
           if let Some(callback) = &mut (*descriptor.get()).on_write {
             let desc = crate::utilities::ble_gap_conn_find(conn_handle).unwrap();
             let mut arg = OnWriteDescriptorArgs {
-              current_data: (*descriptor.get()).value.value(),
+              current_data: (*descriptor.get()).value.as_slice(),
               recv_data: &buf,
               desc: &desc,
               reject: false,