Move Arduino_JSON to AirGradient libries

src/Libraries/Arduino_JSON/examples/JSONValueExtractor/JSONValueExtractor.ino

@@ -0,0 +1,69 @@
+/*
+  JSON Value Extractor
+
+  This sketch demonstrates how to use some features
+  of the Official Arduino JSON library to traverse through all the
+  key value pair in the object and the nested objects.
+  Can be very helpful when searching for a specific data in a key
+  which is nested at multiple levels
+  The sketch actually use recursion to traverse all the keys in
+  a given JSON.
+
+  Example originally added on 24-03-2020
+  by Madhur Dixit https://github.com/Chester-King
+
+  This example code is in the public domain.
+*/
+
+#include <Arduino_JSON.h>
+
+void setup() {
+
+  Serial.begin(9600);
+  while (!Serial);
+  valueExtractor();
+
+}
+
+void loop() {
+}
+
+void valueExtractor() {
+
+  Serial.println("object");
+  Serial.println("======");
+  JSONVar myObject;
+
+  // Making a JSON Object
+  myObject["foo"] = "bar";
+  myObject["blah"]["abc"] = 42;
+  myObject["blah"]["efg"] = "pod";
+  myObject["blah"]["cde"]["pan1"] = "King";
+  myObject["blah"]["cde"]["pan2"] = 3.14;
+  myObject["jok"]["hij"] = "bar";
+
+  Serial.println(myObject);
+  Serial.println();
+  Serial.println("Extracted Values");
+  Serial.println("======");
+
+  objRec(myObject);
+
+}
+
+void objRec(JSONVar myObject) {
+  Serial.println("{");
+  for (int x = 0; x < myObject.keys().length(); x++) {
+    if ((JSON.typeof(myObject[myObject.keys()[x]])).equals("object")) {
+      Serial.print(myObject.keys()[x]);
+      Serial.println(" : ");
+      objRec(myObject[myObject.keys()[x]]);
+    }
+    else {
+      Serial.print(myObject.keys()[x]);
+      Serial.print(" : ");
+      Serial.println(myObject[myObject.keys()[x]]);
+    }
+  }
+  Serial.println("}");
+}