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    The Mega has four UARTs. Why are you using SoftwareSerial? Commented Apr 27, 2017 at 11:50
  • @IgnacioVazquez-Abrams..... But how i can access four Softwareserial for Arduino mega?like syntax for single serial port is as, SoftwareSerial mySerial(18,19); // RX, TX Commented Apr 28, 2017 at 10:49
  • @Code Gorilla But how i can access four Softwareserial for Arduino mega?like syntax for single serial port is as, SoftwareSerial mySerial(18,19); // RX, TX – Hafeez Ahmad Fii Zue 2 mins ago edit Commented Apr 28, 2017 at 10:55