What can I use for communication between the esp8266 card and the mobile application? I know Firebase, but after 100 users, the price is too high for me, 1000-1500 people can use my project, what do you think I should use for communication between the esp8266 and the mobile application? I heard about MQTT, but can it be used for such a project? What do you recommend?
The ESP can generate a web page and then you connect via WiFi.
But this project I am talking about is not a local project, many people can connect from different places. Can I still use it?
Yes, with port forwarding on your router.
Is it practical?-Depends on what you are trying to accomplish.
Is it safe?-Not so.
Better approach would be to find alternative to Firebase. You can search for "free iot cloud", there are hundreds available. Jus one example Thingsboard
Get a VPS such as this, set up an MQTT broker and use it to link your ESP nodes to the mobile app
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