If a GSM modem should be used to send SMS, then what are the requirements for equipment and software for setting up the entire facility?
You need a GSM modem (mobile handset or similar) connected to the server.
Typically, SMS can be sent using AT commands on the serial interface of GSM equipment.
See this tutorial for an example.
This library offers a simple interface for sending SMS messages using a Gsm modem.
Source: https://habr.com/ru/post/1309284/More articles:Problems with the Rails Rails model - ruby-on-railsCreate and use an instance of a class whose class name is known only at run time - reflectionHow to get today the day of the previous month in ruby? - ruby | fooobar.comIs it possible to connect and send a message via a GSM modem using asp.net? - c #use / run python 2to3 as or as unittest - pythonTeamCity and NAnt: How to send a successful start / failed email message? - continuous-integrationSMTP error: "The client does not have permission to send mail to this server" - c #PHP and MySQL - print rows matching column value - phpHow to make NAnt send an email using a real account - nantHow to concatenate all records in a column returned by a query into one varchar row in T-SQL? - sqlAll Articles