In The Name Of Allah The compassionate merciful

Hello ;
Am trying to send AT commands to my GSMmodem device , in linux with PHP
Am sure it is /dev/ttyusb1
But with [URL=""]this code[/URL] device respond
the same command and code prints that command
e.g if we send ATD00 it responds ATD00 , or with AT it responds AT instead
of Ok, why ?

Regards dehqan

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