Change the Network Manager connection stable-id of the current connected Wi-Fi to control the privacy.

wifi-stable-id.sh

#!/usr/bin/bash
# The MIT License (MIT)
# Copyright 2023 Eduardo Leggiero
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
set -e

me="$(basename "$(test -L "$0" && readlink "$0" || echo "$0")")"
fixed_stable_id="\${CONNECTION}/\${DEVICE}"
action=$1
custom_stable_id=$2

if [[ ( "$#" == 1 && ( "$1" == "help" || "$1" == "--help" || "$1" == "-h" ) ) || \
      ! ( "$#" == 0 || \
      ( "$#" == 1 && ( "$action" == "fixed" || "$action" == "default" || "$action" == "show" ) ) || \
      ( "$#" == 2 && ( "$action" == "custom" && "$custom_stable_id" != "" ) ) \
      ) ]]; then
  >&2 echo "Usage: $me [fixed | default | show]"
  >&2 echo "       $me custom [stable-id]"
  >&2 echo "       $me [help | --help | -h]"
  exit 1
fi
[[ -z "$action" ]] && action="show"

current_wifi="$(nmcli -t -f active,ssid dev wifi | grep '^yes' | cut -d: -f2)"
if [[ -z "$current_wifi" ]]; then
  >&2 echo -e "\033[0;31mNot connected to a Wi-Fi connection.\033[0m"
  exit 1
fi
echo -e "Current Wi-Fi connection: \033[0;36m$current_wifi\033[0m"

connection_uuid="$(nmcli c show | awk -F'  +' -v uuid="$current_wifi" '$3 == "wifi" && $1 == uuid {print $2}')"
echo -e "Network Manager UUID:     \033[0;36m$connection_uuid\033[0m"

current_stable_id="$(nmcli c show "$connection_uuid" | grep connection.stable-id | awk '{print $2}')"
[[ "$current_stable_id" == "--" ]] && current_stable_id=""
echo -ne "Current stable-id value:  "
if [[ "$current_stable_id" == "" ]]; then
  echo -ne "\033[0;35m\033[3mdefault\033[0m"
else
  echo -ne "\033[0;36m$current_stable_id\033[0m"
fi
echo -ne " \033[0;34m\033[3m("
if [[ "$current_stable_id" == "$fixed_stable_id" ]]; then
  echo -n "fixed"
elif [[ "$current_stable_id" == "" ]]; then
  echo -n "default"
else
  echo -n "custom"
fi
echo -e ")\033[0m"

if [[ "$action" == "show" ]]; then
  exit 0
elif [[ "$action" == "fixed" ]]; then
  new_stable_id="$fixed_stable_id"
elif [[ "$action" == "default" ]]; then
  new_stable_id=""
elif [[ "$action" == "custom" ]]; then
  new_stable_id="$custom_stable_id"
fi

if [[ "$current_stable_id" == "$new_stable_id" ]]; then
  echo -ne "\033[0;33mNot changed as stable-id is already "
  if [[ "$action" == "custom" ]]; then
    echo -ne "the custom value \"$custom_stable_id\""
  else
    echo -ne "$action"
  fi
  echo -e ".\033[m"
  exit
fi

echo -ne "New stable-id value:      "
if [[ "$new_stable_id" == "" ]]; then
  echo -ne "\033[0;35m\033[3mdefault\033[0m"
else
  echo -ne "\033[0;36m$new_stable_id\033[0m"
fi
echo -ne " \033[0;34m\033[3m("
if [[ "$new_stable_id" == "$fixed_stable_id" ]]; then
  echo -n "fixed"
elif [[ "$new_stable_id" == "" ]]; then
  echo -n "default"
else
  echo -n "custom"
fi
echo -e ")\033[0m"

nmcli c modify "$connection_uuid" connection.stable-id "$new_stable_id"
echo -e "\033[0;32mChanged!\033[0m"