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#! /vendor/bin/sh
# Set Bluetooth address (BT_ADDR).
#
# Copyright (C) 2023 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Get the unique board serial number from /proc/cmdline,
# prepend '0's to the serial number to fill 5 LSBs of the
# BT address and prepend "C0" as MSB to prepare a 6 byte
# Bluetooth Random Static Address. Reference:
# https://www.bluetooth.com/wp-content/uploads/2022/05/Bluetooth_LE_Primer_Paper.pdf [Page 23]
#
# Format the output in xx:xx:xx:xx:xx:xx format for the
# "bdaddr" command to work.
BTADDR=`/vendor/bin/cat /proc/cmdline | vendor/bin/grep -o serialno.* |\
/vendor/bin/cut -f2 -d'=' | /vendor/bin/awk '{printf("C0%010s\n", $1)}' |\
/vendor/bin/sed 's/\(..\)/\1:/g' | /vendor/bin/sed '$s/:$//'`
/vendor/bin/hw/bdaddr "${BTADDR}"
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