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when connecting arduino uno with gsm module, i received at+httpinit error

akshgsm

i need to establish  http connection . i am using arduino uno and gsm modem simcom sim900a and idea sim card

 

AT+CSQ

AT+CGATT?

AT+SAPBR=3,1,"CONTYPE","GPRS"

 

+CSQ: 15,0

AT+SAPBR=3,1,"APN","imis/internet"

 

OK

AT+SAPBR=1,1

 

OK

AT+HTTPINIT

 

ERROR

AT+HTTPPARA="URL","www.google.com"

 

ERROR

AT+HTTPACTION=0

 

ERROR

AT+HTTPREAD

 

ERROR

 

thanks in advance