Hello,

I am using google-cloud-iot-arduino on an ESP8266 based board. I am trying to send files to Google Cloud and I am currently able to do it by splitting them in 256 byte chunks. I store these chunks in Firestore using a cloud function and then put them back together using another cloud function and I store the file in a GCS bucket. What is the best way for me to use publishTelemetry to send an entire file (avg file size is 40k)? thanks! Marco .. here below what I am currently doing

size_t size = 0;
File dataFile = SPIFFS.open(pic_file_camera, "r");
size = dataFile.size();

if (dataFile) {
byte data[256];

int i = 0;
int total_bytes = 0;
while (dataFile.available()) {
  if (i < 256) {
    // if we haven't read 256 bytes yet, then keep reading!
    data[i++] = dataFile.read();
    total_bytes ++;
  } else {
    delay(100);
    //  send the read 256 bytes and reset the counter
    publishTelemetry("/pictures", (char *)data, 256);
    i = 0;
  }
}

// send the remaining i bytes 
delay(100);
publishTelemetry((char *)data, i);

delay(20);
// Close the file
dataFile.close();