Hello Recently, there was a need to develop an SMS gateway. The machine is supposed to send notifications to employees, the number of sms sent is not much 10-50 a month, so it makes no sense to buy a subscription to the www-sms API. The machine is based on a USB-GSM modem: LC SIM800C V3 (aliexp.. price 3-8$) I used UDF: ComUDF.au3  Thank you mLipok for your work! Below is the program code with an example WARNING! The program is written very extensively (not optimi