Raspberry Pi setup to send IP changes via telegram

99_telegram

# /lib/dhcpcd/dhcpcd-hooks/99-telegram
#
# Notify telegram chat of ip changes
# man dhcpcd-run-hooks for variables

TELEGRAM=/home/pi/bin/telegram

if $if_up; then
  case "$reason" in
  BOUND|BOUND6)
    if [ "${new_ip_address}" != "${old_ip_address}" ]; then
       $TELEGRAM "$(hostname) (Raspberry) got ${new_ip_address} on ${interface}. Was ${old_ip_address}."
    fi
    ;;
  REBOOT)
    $TELEGRAM  "$(hostname) (Raspberry) got ${new_ip_address} on ${interface} after reboot. Uptime: `uptime`"
    ;;
  *)
    $TELEGRAM  "$(hostname) (Raspberry) got ${new_ip_address} on ${interface}. Was ${old_ip_address}. Reason: ${reason}"
    ;;
  esac
fi

telegram

#!/bin/bash
# usage: telegram <message>

# strict mode
set -euo pipefail

# Fill these
API_KEY=''
CHAT_ID=''

function sendMessage {
    echo "sending"
    #  local MSG="${1:?No message given}"
    curl -i -X GET -G \
    --data-urlencode "chat_id=${CHAT_ID}" \
    --data-urlencode "text=${1:?No message given}" \
    "https://api.telegram.org/bot${API_KEY}/sendMessage";
}

sendMessage "$@"