Is there a working Android application - a gateway for sending SMS?

Question

Android

Five years ago there were no problems, at the request of "SMS Gateway" in Google Play there were several applications like "TCP 2 SMS" in order to send a TCP / HTTP request to an Android smartphone with a number and message text on the local network. The smartphone accepted the request and sent SMS.

Now these applications do not work on Android 11 (the smartphone notifies that the application may not work correctly, as it was made for the old version of the OS and SMS is not sent).

Perhaps someone saw a fresh working application for organizing an SMS gateway (without third-party services, namely in the local network for Android 11)?

Answer 1

If someone needs it:
https://github.com/stefalda/sms_sender - a working solution for flutter (it is assembled in an apk without special mobile development skills)

Answer 2

smartphone notifies that the application may not work correctly

Do apps really work wrong? It's one thing to notify (because deprecated libraries are probably used), it's another thing not to work at all.
It is possible to write such an application. It does not seem to me that this is a very difficult task, the libraries are all documented. The truth remains the question of the visibility of the smartphone in the local network. Nakrayanyak can be done and PUSH is not a difficult task.
Another question is why? Almost no one communicates via SMS, and to write a program for SMS spam - to sign in your own non-traditional orientation (although you can put a captcha in it, for example, or one message every minute).

Answer 3

Smsgateway24 works with android 11 without issue. To send from your server, request a White Label.