Cloud Firestore REST API - Add server timestamp

Question

I\'m using an Arduino with an ESP8266-01 module to upload a value to a Cloud Firestore database using the createDocument API with the following payload:

{
    \"         


        

Answer 1

What I ended up doing in the end was the following:

A POST request to a route like this:

https://firestore.googleapis.com/v1beta1/projects//databases/(default)/documents:commit?&key=

With the following payload:

{
    "writes": [
        {
            "update": {
                "name": "projects//databases/(default)/documents//",
                "fields": {
                    "distance": {
                        "integerValue": "555"
                    }
                }
            }
        },
        {
            "transform": {
                "document": "projects//databases/(default)/documents//",
                "fieldTransforms": [
                    {
                        "fieldPath": "servertime",
                        "setToServerValue": "REQUEST_TIME"
                    }
                ]
            }
        }
    ]
}

Where I generate a new DOCUMENT_ID (e.g. a GUID) instead of having cloud firestore generate one for me.