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To use alarm function in sim900 use the command AT+CALA
SIM900 can save upto 5 alarms, use AT+CALA? to view all saved alarm to set a alarm use command AT+CALA="yy/mm/dd,hh:mm:ss" To set a reccuring alarm use the command AT+CALA="hh:mm:ss,X,0 where X should be empty alarm index to view all alarm...
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