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#include <SoftwareSerial.h>
SoftwareSerial M590(2, 3); // RX | TX
// Connect the M590 TX to Arduino pin 2 RX. 
// Connect the M590 RX to Arduino pin 3 TX. 
char c = ' ';
void setup() 
{
    // start th serial communication with the host computer
    Serial.begin(9600);
    while(!Serial);
    Serial.println("Arduino with M590 is ready");
 
    // start communication with the M590 in 9600
    M590.begin(9600);  
    Serial.println("M590 started at 9600");
    delay(1000);
    Serial.println("Setup Complete! M590 is Ready!");
}
 
void loop()
{
 
     // Keep reading from SIM800 and send to Arduino Serial Monitor
    if (M590.available())
    { c = M590.read();
      Serial.write(c);}
 
    // Keep reading from Arduino Serial Monitor and send to M590
    if (Serial.available())
    { c = Serial.read();
      M590.write(c);  
       }

}