stPassthru.ino

/**********
 * SmartThings Arduino Shield Passthrough
 * For use on Arduino Mega
 * author: github.com/tprynn
 * Attach Shield normally with switch on 2/3. 
 * Jumper pins:
 *  - 18 (Tx1) to Shield 3 (Rx)
 *  - 19 (Rx1) to Shield 2 (Tx)
 **********/


#define BUF_SIZE 512

void setup() {
 delay(1500);
 Serial.begin(115200);
 Serial1.begin(2400); 
}

byte buffer[BUF_SIZE];
int bytes;
void loop() {
  if(Serial.available()) {
    memset(buffer, 0, BUF_SIZE);
    bytes = Serial.readBytes((char *)buffer, BUF_SIZE);
    // local echo:
    Serial.write(buffer, bytes);
    Serial1.write(buffer, bytes);
  }
  
  if(Serial1.available()) {
    memset(buffer, 0, BUF_SIZE);
    bytes = Serial1.readBytes((char *)buffer, BUF_SIZE);
    Serial.write(buffer, bytes);
  }
}