I have problems because sometimes the sim900 operates correctly activating the assigned DO, but then it stops working. I do not know what else to do, use the code "AT + CMGDA = " "to delete the existing messages in the sim900 but you still got the problem. I reset the arduino and you noticed the p…

the sim900 sometimes operates well and then stops operating correctly.

Surbyte April 5, 2018, 6:44pm 3

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