Health logs in Notehub on each sync from card.attn

Notehub.io
1

Hello, I’m using the Notecarrier F and Swan. I recently followed this guide to enable DFU, and I’ve noticed that now each time I call hub.sync I get flooded with a bunch of _health.qo events that look like this:

{
  "method": "dfu",
  "text": "host restarted: card.attn sleep (interrupt)",
  "voltage": 4.2109375
}

My code takes a sensor reading once per minute then uses card.attn to put the MCU to sleep. After 30 readings I call hub.sync. It seems like each of those attn events is being logged and sent to Notehub. Is there any way to prevent this? I’ve included a snippet of my setup and loop functions in case I’m doing something incorrectly there.

void setup(void) {
  Wire.begin();
  Wire.setClock(400000);

  Serial.begin(9600);
  while (!scd30.begin()) {}

  notecard.begin();
  notecard.setDebugOutputStream(Serial);

  // Configure Notehub
  J *req = notecard.newRequest("hub.set");
  JAddStringToObject(req, "product", productUID);
  JAddStringToObject(req, "mode", "minimum");
  notecard.sendRequest(req);

  req = notecard.newRequest("card.dfu");
  if (req != NULL) {
    JAddStringToObject(req, "name", "stm32");
    JAddBoolToObject(req, "on", true);
    notecard.sendRequest(req);
  }
...
}

void loop() {
  auto inputLength = strlen(myBuffer);
  static char output[3000];
  base64::encode((const uint8_t*)myBuffer, inputLength, output);

  J *req = notecard.newCommand("card.attn");
  JAddStringToObject(req, "mode", "sleep");
  if (strlen(output) > 0)
    JAddStringToObject(req, "payload", output);
  JAddNumberToObject(req, "seconds", READING_INTERVAL);
  notecard.sendRequest(req);

  // Delay 1 second in case the host fails to sleep and try again
  delay(1000);
}
2

Hi @will and welcome to the Blues community!

This is actually a known issue and will be resolved in the next Notecard firmware Developer Release (which should be out in the next few weeks). In the meantime, you can safely ignore these events as _health.qo Notes are platform events, meaning they are generated on Notehub and don’t count against your event credit charges.

Thanks,
Rob

3

Thank you very much!