serverTimestamp in Firestore

[lougira]

Hello,

I try to add a timestamp field in Firestore. I would like to get the server timestamp. I notice in the repo main page the following :

The server's Timestamp can be stored in the database through Firebase.RTDB.setTimestamp.

I wrote the following code:

void write_on_firebase(float temp, float hum, int dis)
{
    dataMillis = millis();

    Serial.printf("Set timestamp... %s\n", Firebase.setTimestamp(fbdo, "/test/timestamp") ? "ok" : fbdo.errorReason().c_str());

    if (fbdo.httpCode() == FIREBASE_ERROR_HTTP_CODE_OK)
    {
      // In setTimestampAsync, the following timestamp will be 0 because the response payload was ignored for all async functions.

      // Timestamp saved in millisecond, get its seconds from int value
      Serial.print("TIMESTAMP (Seconds): ");
      Serial.println(fbdo.to<int>());

      // Or print the total milliseconds from double value
      // Due to bugs in Serial.print in Arduino library, use printf to print double instead.
      printf("TIMESTAMP (milliSeconds): %lld\n", fbdo.to<uint64_t>());
    }

    Serial.printf("Get timestamp... %s\n", Firebase.getDouble(fbdo, "/test/timestamp") ? "ok" : fbdo.errorReason().c_str());
    if (fbdo.httpCode() == FIREBASE_ERROR_HTTP_CODE_OK)
      printf("TIMESTAMP: %lld\n", fbdo.to<uint64_t>());

    String documentPath = "Cuve/mesure";
    documentPath += String(count);

    // Add values in the document
    content.set("fields/hauteur/doubleValue", dis/10.0);
    content.set("fields/temperature/doubleValue", String(temp));
    content.set("fields/humidite/doubleValue", String(hum));
    content.set("Ts/.sv", "timestamp"); //  timestamp

    String doc_path = "projects/";
    doc_path += FIREBASE_PROJECT_ID;
    doc_path += "/databases/(default)/documents/coll_id/doc_id"; // coll_id and doc_id are your collection id and document id

    count++; // incrémentation du nb de mesure pour la création du nouveau doc dans firestore

    // Display in the console if Firestore writing is succesfull
    if (Firebase.Firestore.createDocument(&fbdo, FIREBASE_PROJECT_ID, "" /* databaseId can be (default) or empty */, documentPath.c_str(), content.raw()))
       Serial.printf("ok\n%s\n\n", fbdo.payload().c_str());
    else
        Serial.println(fbdo.errorReason());
}

When I build this code, the error is :

Compiling .pio\build\dfrobot_firebeetle2_esp32e\src\main.cpp.o
src/fonctions.cpp: In function 'void write_on_firebase(float, float, int)':
src/fonctions.cpp:188:53: error: 'class Firebase_ESP_Client' has no member named 'setTimestamp'
     Serial.printf("Set timestamp... %s\n", Firebase.setTimestamp(fbdo, "/test/timestamp") ? "ok" : fbdo.errorReason().c_str());
                                                     ^~~~~~~~~~~~
src/fonctions.cpp:203:53: error: 'class Firebase_ESP_Client' has no member named 'getDouble'
     Serial.printf("Get timestamp... %s\n", Firebase.getDouble(fbdo, "/test/timestamp") ? "ok" : fbdo.errorReason().c_str());
                                                     ^~~~~~~~~
*** [.pio\build\dfrobot_firebeetle2_esp32e\src\fonctions.cpp.o] Error 1

I can't figure out where is the problem and I don't understand why the setTimestamp() method is not a member function of the class Firebase. By the way, can the setTimestamp() be used for Firestore?

[mobizt]

For RTDB, you have to follow this example. https://github.com/mobizt/Firebase-ESP-Client/blob/main/examples/RTDB/Timestamp/Timestamp.ino

Firestore and Realtime database are totally different, and nothing is compatible.

[cinqlair]

So it means that with this library, we can't use serverTimestamp with Firestore? Can you confirm this?

[mobizt]

You should consult the Firestore documentation.