#include <ArduinoJson.h>

String message="{\"Pw\":406,{\"Pf\":0.46,{\"Pva\":795}";


float ValJson(String nom, String Json) {
  int p = Json.indexOf(nom + "\":");
  Json = Json.substring(p);
  p = Json.indexOf(":");
  Json = Json.substring(p + 1);
  int q = Json.indexOf(",");
  p = Json.indexOf("}");
  p = min(p, q);
  float val = 0;
  if (p > 0) {
    Json = Json.substring(0, p);
    val = Json.toFloat();
  }
  return val;
}


void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  Serial.println(message);
  Serial.println("\n Modele ValJson");
  Serial.println(ValJson("Pw",message));
  Serial.println(ValJson("Pf",message));
  Serial.println(ValJson("Pva",message));

  Serial.println("\n Modele ArduinoJson");
  JsonDocument doc;
  DeserializationError error = deserializeJson(doc, message);
  float Pw = doc["Pw"]; // 406
  float Pf = doc["Pf"]; // 0.46
  float Pva = doc["Pva"]; // 795
  Serial.println(Pw);
  Serial.println(Pf);
  Serial.println(Pva);
  
  if (error) {
  Serial.print("deserializeJson() failed: ");
  Serial.println(error.c_str());
  return;
}

}

void loop() {
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
}