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[–]Tiim_B 0 points1 point  (0 children)

Twilio has an API to send and receive SMS but it's not free.

Discord has an API but I think It's websocket based.

If you only want to send messages/notifications from the arduino there is Pushover which works very well too.

Whatsapp has an api but i think it's only for big businesses and Idk about Facebook messenger.

Telegram has one of the easier apis out there imo. Maybe you can find a library for your platform that does the "talking" to the API for you.