如何使用Arduino访问从Firestore收到的payload()中的内容

问题描述

我正在使用 Arduino 从 Firestore（一个数据库）读取一些数据。我可以使用rest Api从firestore中成功获取数据，并设法获取Payload()，但我正在尝试将其中一些数据存储到布尔值中。
这是我从数据库中收到的：

{
  "name": "","fields": {
    "nome_botao": {
      "stringValue": "botao1"
    },"nome": {
      "stringValue": "Quarto"
    },"icon": {
      "stringValue": "LightBulb"
    },"value": {
      "booleanValue": true
    }
  },"createTime": "2021-02-01T17:59:56.695439Z","updateTime": "2021-02-01T18:13:49.703817Z"
}

我正在尝试从我的有效负载中存储 booelanValue。
这是我的代码：

#if defined(ESP32)
#include <WiFi.h>
#elif defined(ESP8266)
#include <ESP8266WiFi.h>
#endif
#include <Firebase_ESP_Client.h>

/* 1. Define the WiFi credentials */
#define WIFI_SSID "stuuf"
#define WIFI_PASSWORD "stuuf"

/* 2. Define the project ID */
#define FIREBASE_HOST "stuuf-stuuf-stuuf.firebaseio.com"
#define FIREBASE_PROJECT_ID "stuuf-stuuf-stuuf"
#define API_KEY "stuuf"

/* 3. Define the user Email and password that alreadey registerd or added in your project */
#define USER_EMAIL "stuuf"
#define USER_PASSWORD "stuuf"

bool currentState;

//Define Firebase Data object
FirebaseData fbdo;

FirebaseAuth auth;
FirebaseConfig config;

unsigned long dataMillis = 0;
int count = 0;

void setup()
{

    Serial.begin(115200);

    WiFi.begin(WIFI_SSID,WIFI_PASSWORD);
    Serial.print("Connecting to Wi-Fi");
    while (WiFi.status() != WL_CONNECTED)
    {
        Serial.print(".");
        delay(300);
    }
    Serial.println();
    Serial.print("Connected with IP: ");
    Serial.println(WiFi.localIP());
    Serial.println();

    config.host = FIREBASE_HOST;
    config.api_key = API_KEY;

    /* Assign the user sign in credentials */
    auth.user.email = USER_EMAIL;
    auth.user.password = USER_PASSWORD;

    Firebase.begin(&config,&auth);
    Firebase.reconnectWiFi(true);

#if defined(ESP8266)
    //Set the size of WiFi rx/tx buffers in the case where we want to work with large data.
    fbdo.setBSSLBufferSize(1024,1024);
#endif

    String content;

    FirebaseJson js;
}

void loop()
{

    if (millis() - dataMillis > 60000 || dataMillis == 0)
    {
        dataMillis = millis();

        String documentPath = "mypath";
        String mask = "";

        Serial.println("------------------------------------");
        Serial.println("Get a document...");

        if (Firebase.Firestore.getDocument(&fbdo,FIREBASE_PROJECT_ID,"",documentPath.c_str(),mask.c_str()))
        {
            Serial.println("PASSED");
            Serial.println("------------------------------------");
            Serial.println(fbdo.payload());
            Serial.println("------------------------------------");
            Serial.println();
        }
        else
        {
            Serial.println("Failed");
            Serial.println("REASON: " + fbdo.errorReason());
            Serial.println("------------------------------------");
            Serial.println();
        }
    }
}

CurrentState 是 bool 值，它将从有效负载接收“值”。

解决方法

由于您从 Firestore 获得的文档是 JSON，因此您需要一个 JSON 解析器来从中获取数据。例如：ArduinoJson