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UART communication issue

Question asked by RAHMAN.MD._MOSHFIQUR on Oct 6, 2016
Latest reply on Oct 6, 2016 by Clive One
is there any way so that i can know whether my uart is active or not ,i wanna send an AT Command to a gsm module such as "AT+CCLK?" in return of this command the GSM module will give the time and date from nearest gsm tower as reply to that AT Command, actually i want a function just like Serial.available()>0 in arduino. I'm using Keil 5 and a beginner so please help me out.