To send an HLR request, use the normal SMS message sending command, specifying format as 3.
The <mes><mes> parameter with the message text is not used and can be empty.
The result of the request can be obtained via the HTTP protocol by automatically calling the handler, or you can independently request the status
of the sent SMS message with a special command. Since the HLR request is executed asynchronously, and the result may not return from the operator immediately,
it is important to make a loop of several iterations with falling asleep (the sleep command) when requesting the status independently.).
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SENDING AN HLR REQUEST
