System Modes

Automatic mode (threading enabled)

SYSTEM_MODE(AUTOMATIC);
SYSTEM_THREAD(ENABLED);

void setup() {
  // This is called even before being cloud connected
}

void loop() {
  // This is too
}

When also using SYSTEM_THREAD(ENABLED), the following are true even in AUTOMATIC mode:

  • When the device starts up, it automatically tries to connect to Wi-Fi or Cellular and the Particle Device Cloud.
  • Messages to and from the Cloud are handled from a separate thread and are mostly unaffected by operations in loop.
  • If you block loop() from returning you can still impact the following:
    • Function calls
    • Variable retrieval
    • Serial events

Using SYSTEM_THREAD(ENABLED) is recommended.