It looks like the SIM 900 is just echoing everything it sees. Perhaps it has to be switched to Command Mode. Often this is done with:
delay(1000);
Serial1.print("+++"); // Start command mode
delay(1000);
It looks like the SIM 900 is just echoing everything it sees. Perhaps it has to be switched to Command Mode. Often this is done with:
delay(1000);
Serial1.print("+++"); // Start command mode
delay(1000);