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1

I recommend you to use AT command ..then using some kind of library. You need to dig into library for better information. https://randomnerdtutorials.com/sim900-gsm-gprs-shield-arduino/ Go through this link....this will give you a rough idea.


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You can convert you double data to string type.this trick may help. And you also can just sent a byte for different positions and decode them in app.


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