diff --git a/ble/protocol/Constants.ts b/ble/protocol/Constants.ts
index 7a917b7..6abe9b5 100644
--- a/ble/protocol/Constants.ts
+++ b/ble/protocol/Constants.ts
@@ -6,7 +6,7 @@ export const BLE_UUIDS = {
     BROADCAST_CHARACTERISTIC: "000002c1-0000-1000-8000-00805f9b34fb",
     WRITE_CHARACTERISTIC: '000002c5-0000-1000-8000-00805f9b34fb',
     READ_CHARACTERISTIC: '000002c6-0000-1000-8000-00805f9b34fb',
-    REQUEST_MTU: 517,
+    REQUEST_MTU: 512,
 } as const;
 
 export const FRAME_CONSTANTS = {