millis_test.cpp

#include "application.h"

SYSTEM_MODE(MANUAL);
SYSTEM_THREAD(ENABLED);

uint32_t lastMillis = 0;

void setup()
{
  Serial.begin(9600); //Begin USB serial session
  Serial.blockOnOverrun(false); //don't let serial block

  delay(5000); //start-up delay
#if PLATFORM_ID == 10
  Cellular.off();
#else
  WiFi.off();
#endif
}

void loop()
{
  uint32_t mil1 = millis();
  Serial.println("Millis: " + String( mil1 ) ); 
  uint32_t mil2 = millis();
  if (mil2 - lastMillis >= 10 && lastMillis != 0) {
    Serial.blockOnOverrun(true);
    // Consume RX buffer
    while(Serial.available())
      (void)Serial.read();
    while(Serial.available() == 0) {
      Serial.println("Diff: " + String(mil2 - lastMillis));
      Serial.println("Press any key to continue");
      Serial.flush();
      delay(1000);
    }
    while(Serial.available())
      (void)Serial.read();
    Serial.blockOnOverrun(false);
    lastMillis = millis();
  } else {
    lastMillis = mil1;
  }
}