ESP8266 with Firebase (firebase-arduino-master) adds unique key

Question

I have a problem with saving data in Firebase realtime and sending from ESP8266. I use firebase-arduino-master library. I want to send the soil moisture information from ESP8266 to Firebase periodically. Connecting works, data is being transferred, but in the database I can see an automatically added prefix - a unique key. enter image description here

My code:

    void setup() 
{
  Serial.begin(9600);
  delay(1000);                    
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);                               
  Serial.print("Connecting to ");
  Serial.print(WIFI_SSID);
  while (WiFi.status() != WL_CONNECTED) 
  {
    Serial.print(".");
    delay(500);
  }
  Serial.println();
  Serial.print("Connected to ");
  Serial.println(WIFI_SSID);
  Serial.print("IP Address: ");
  Serial.println(WiFi.localIP());                               //prints local IP address
  Firebase.begin(FIREBASE_HOST, FIREBASE_AUTH);                 // connect to firebase
  Serial.println(Firebase.success());
  Serial.println("OK");
  timeClient.begin();
  delay(2000);
}

void loop() {
  timeClient.update();
  float moisture_percentage;

  moisture_percentage = map(analogRead(sensor_pin), 696, 328, 0, 100);

  unsigned long epochTime = timeClient.getEpochTime();

//Get a time structure
  struct tm *ptm = gmtime ((time_t *)&epochTime); 
  int monthDay = ptm->tm_mday;
  int currentMonth = ptm->tm_mon+1;
  int currentYear = ptm->tm_year+1900;
  //Print complete date:
  String currentDate = String(currentYear) + "-" + String(currentMonth) + "-" + String(monthDay);
  Serial.print(currentDate);
  Serial.print(" ");
  Serial.print(timeClient.getFormattedTime());
  Serial.print(" - ");
  Serial.print(moisture_percentage);
  Serial.println("%");
  float m = moisture_percentage;
  String fireMoist = String(currentDate) + String(" ") + String(timeClient.getFormattedTime()) + String(" ") + String(moisture_percentage) + String("%");                  //Moisture integer to string conversion
  Firebase.pushString("MOIST", fireMoist);                                   //setup path to send Moisture readings
 
  delay(2000);
}

I want to know how remove the prefix, unique key. Thanks for helping!

You didn't include enough code to be sure but if timeClient is an NTP client, please do not call it during every loop iteration. That's an extremely hostile way to use NTP. The ESP32 has a built in real time clock which doesn't need to be synced constantly with NTP. — romkey
– romkey, Commented Feb 3, 2022 at 21:51

romkey · Accepted Answer · 2022-02-03 21:58:09Z

0

This "prefix" is the document's ID, automatically generated by Firebase. You don't get rid of it. It's integral to how the database works - every document has a unique identifier. Why do you think it's a problem?

answered Feb 3, 2022 at 21:58

romkey

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2 Comments

dykuman Over a year ago

OK I understand. This is problem because when I export a database to process it, the prefix causes extra work.

romkey Over a year ago

It should be trivial to write a script to strip the field from the export. Or just import the key into the new database. Either way, it’s not optional in Firebase.

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