serial_crash.ino

bool state = false;

void setup() {
    pinMode(D7, OUTPUT);
    
    Particle.keepAlive(1.5 * 60);
    //Serial1.begin(9600);  // crashes, uncomment to run normally.
    
    Particle.function("test", doTest);
    Particle.connect();
}

void loop() {
    digitalWrite(D7, (state) ? HIGH : LOW);
    state = !state;
    
    Serial1.println("anything");
    delay(1000);
}


int doTest(String command) {
    digitalWrite(D7, (state) ? HIGH : LOW);
    state = !state;
    delay(250);
    
    digitalWrite(D7, (state) ? HIGH : LOW);
    state = !state;
    delay(250);
}