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Good afternoon, I am new in the programming part in Arduino, I am with an SIM900 connected to an Arduino UNO, I am making an application in VB.NET that will communicate by Serialport, which will send message, receive and see on screen. However I am lost in what you have to put to transmit the data via serial, in Rduino the AT commands worked cool on the terminal screen, when I go to VB.NET the serial.write does not recognize. You need some specific programming for this on Arduino and send the commands by VB.NET?
Thank you for your attention!