Communication by sending SMS messages in the GSM network

1 Sending/receiving SMS messages over the external GSM modem

In the PROMOTIC system there is the PmSMS communication driver. It allows sending/receiving SMS messages to/from the GSM network.

2 Sending/receiving email messages over the Internet

Internet access is required to use these services. Some of these services are available for free, while other are charged.
In most cases, it is better to use commercial services, which guarantee a certain level of reliability for sending SMS messages and provide a documented interface for sending messages.
Some commercial services allow not only sending but also receiving SMS messages.
Sending or receiving SMS messages is most often done using the HttpRequest service (see Preconfiguration "HttpRequest - Receive or send (GET, POST)"),
while some services offer a REST API interface (see Preconfiguration "REST API - Client - receive or send (GET, POST)").

3 Using a hardware module with a different communication method

This method of sending SMS messages is used in cases where a computer running the PROMOTIC application does not have Internet access but needs to send SMS messages.
In such cases, it is possible to use various devices that offer the ability to send SMS messages via their web interface
Sending SMS messages is then performed using the HttpRequest service (see Preconfiguration "HttpRequest - Receive or send (GET, POST)"). For example:

The SiteManager device of the xx39 series (1139/3339 of 3G or 4G type) by the Secomea company (Denmark, https://www.secomea.com), that are equipped with SIM card slot.
The device must be configured so it receives http requests from computer with the PROMOTIC application.
The devices use the port 26864 by default (can be changed in device settings).
Example: just send Ethernet message to address "http://192.168.1.88:26864/SMS/+420602345678/Hello".