| type | string | Yes | Event type. The value **characteristicWrite** indicates a characteristic write request event.|
| callback | Callback<[DescriptorWriteReq](#descriptorwritereq)> | Yes | Callback invoked to return a characteristic write request from the GATT client. |
| callback | Callback<[CharacteristicWriteReq](#descriptorwritereq)> | Yes | Callback invoked to return a characteristic write request from the GATT client. |
**Return value**
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@@ -1984,7 +1984,7 @@ Subscribes to the descriptor read request events.
| type | string | Yes | Event type. The value **descriptorRead** indicates a descriptor read request event.|
| callback | Callback<[DescriptorReadReq](#descriptorreadreq)> | Yes | Callback invoked to return a descriptor read request event from the GATT client. |
| callback | Callback<[DescriptorReadReq](#descriptorreadreq)> | Yes | Callback invoked to return a descriptor read request from the GATT client. |
**Return value**
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@@ -3116,10 +3116,10 @@ Defines the parameters of **BLEConnectChangedState**.