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+===== Functions to send notifications =====
+==== SendSMS(phone_number, message) ====
+The SendSMS function sends a request to send an SMS to the number **phone_number** with the text **message**. Returns false if an error occurred and true if successful. Success does not mean delivering a message, but only success when creating a query. This function requires an Internet connection, an account in [[http://docs.webhmi.com.ua/introduction_to_level2 | Level2]] system and a positive balance in it. The service is paid.
+Format of **phone_number** - only digits with the country code, without spaces, brackets, plus sign. For example, "380123456789".
+==== SendEmailMessage(emailAddress, subject, message) ====
+The SendEmailMessage function sends a request to send an e-mail to **emailAddress** with the subject of the letter **subject** and the text **message**. Returns false if an error occurred and true if successful. Success does not mean delivering a message, but only success when creating a query. This function requires an Internet connection, an account in [[http://docs.webhmi.com.ua/introduction_to_level2 | Level2]] system and a positive balance in it. The service is paid.
+The field **message** can contain the html-code.
+Example:
+<code lua>
+function main (userId)
+    SendEmailMessage("address@company.com",
+               "Cooler malfunction. Low oil level.",
+                "<p style='color: red;'>Cooler error #12 has occurred.</p><p>Низкий уровень масла.</p>");
+end
+</code>
+The function is available since WebHMI 2.7.4710 version.
+==== SendTelegramMessage(chatId, message) ====
+The SendTelegramMessage function sends a message with the text **message** to the chat with Id = **chatId**. Returns 1 if an error occurred and 0 if successful. Success does not mean delivering a message, but only success when creating a query. To use this function, you must have an Internet connection, an account in the [[Introduction to Level2 | Level2]] system. The service is free.
+To get ChatId, go to [[http://telegram.me/webhmibot]] on your mobile phone (by pre-installing Telegram) and start the dialog with bot webhmibot using the /start command. In response you will receive a message with a unique chatId.
+Example:
+{{ :telegram_screenshot.png?direct&400 |}}
+==== SendViberMessage(chatId, message) ====
+The SendViberMessage function sends a message with the text 'message' to the chat with Id = **chatId**. Returns 1 if an error occurred and 0 if successful.
+Success does not mean delivering a message, but only success when creating a query. To use this function, you must have a working Internet connection, an account in the system [[Introduction to Level2 | Level2]] and a positive balance in this system. The service is chargeable. This feature is available starting with firmware version 2.4.4227.
+To get ChatId, go to [[http://viber.com/webhmi]] on your mobile phone (having previously installed Viber), click 'Have a look' button.
+{{ :viber_1.png?direct&400 |}}
+You will be taken to the public WebHMI account. Go to the personal messages of the public account by clicking the button at the top right.
+{{ :viber_2.png?direct&400 |}}
+Write any text in the chat. In response you will receive a message with a unique chatId chat ID.
+{{ :viber_3.png?direct&400 |}}