The final piece was a QR code. Not for the cat, but for his own phone. He generated a QR code that contained the Telegram bot’s username and a pre-filled command: /checkcat . He printed it, taped it to his fridge. One scan, one tap, and he could see the living room.
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Telegram uses automated accounts called "Bots" to send external data (like camera alerts) to your private chat. Creating one takes less than two minutes and is completely free. Creating Your Bot Open the Telegram app on your phone or computer. The final piece was a QR code
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Stick that QR code on your IP camera or at your front desk. He printed it, taped it to his fridge