diff --git a/android/hal-msg.h b/android/hal-msg.h
index 09bd9a0..b68a4c7 100644
--- a/android/hal-msg.h
+++ b/android/hal-msg.h
int32_t status;
int32_t handle;
} __attribute__((packed));
+
+#define HAL_GATT_PERMISSION_READ 0x0001
+#define HAL_GATT_PERMISSION_READ_ENCRYPTED 0x0002
+#define HAL_GATT_PERMISSION_READ_ENCRYPTED_MITM 0x0004
+#define HAL_GATT_PERMISSION_WRITE 0x0010
+#define HAL_GATT_PERMISSION_WRITE_ENCRYPTED 0x0020
+#define HAL_GATT_PERMISSION_WRITE_ENCRYPTED_MITM 0x0040
+#define HAL_GATT_PERMISSION_WRITE_SIGNED 0x0080
+#define HAL_GATT_PERMISSION_WRITE_SIGNED_MITM 0x0100