Send notification to a Telegram bot from your device (e.g., Raspberry Pi). It will be helpful when the device has a DHCP IP.

boot_notify.sh

#!/bin/bash

telegram_bot_token="xxx" # ask @BotFather for your Telegram bot token
telegram_chat_id="xxx"   # type /start on the bot, and `curl https://api.telegram.org/bot${telegram_bot_token}/getUpdates` to retrieve chat_id
telegram_api_url="https://api.telegram.org/bot${telegram_bot_token}/sendMessage"

send_to_telegram() {
    local message="$1"
    echo $message
    curl -s -X POST "${telegram_api_url}" -H "Content-Type: application/json" -d "{\"chat_id\": \"$telegram_chat_id\", \"text\": \"$message\"}"
}

product=$(sudo lshw -class system -json | jq -r '.[].product')
sysinfo=$(uname -a)
mac=$(ip link show wlan0 | awk '/ether/ {print $2}')

until ip=$(ip addr show wlan0 | grep "inet " | awk '{print $2}'); [ -n "$ip" ]; do
  echo "Awaiting network availability..."
  sleep 1
done

send_to_telegram "$product"
send_to_telegram "$sysinfo"
send_to_telegram "$ip"
send_to_telegram "$mac"