Provide an example for the raw JSON output functionality

examples/raw_json.cpp

@@ -0,0 +1,52 @@
+/**
+ * @brief Example and test program for using Raw Json output.
+ *
+ */
+
+#include "sensesp/system/lambda_consumer.h"
+#include "sensesp/transforms/lambda_transform.h"
+#include "sensesp_app_builder.h"
+
+using namespace sensesp;
+
+reactesp::ReactESP app;
+
+ObservableValue<bool> toggler;
+
+void setup() {
+#ifndef SERIAL_DEBUG_DISABLED
+  SetupSerialDebug(115200);
+#endif
+
+  SensESPAppBuilder builder;
+  SensESPApp *sensesp_app = builder.set_hostname("json_demo")
+                                ->set_wifi("Hat Labs Sensors", "kanneluuri2406")
+                                ->get_app();
+
+  ReactESP::app->onRepeat(1000, []() { toggler.set(!toggler.get()); });
+
+  // take some boolean input and convert it into a simple serialized JSON
+  // document
+  auto jsonify = new LambdaTransform<bool, String>([](bool input) -> String {
+    DynamicJsonDocument doc(1024);
+    doc["output_1"] = input;
+    String output;
+    serializeJson(doc, output);
+    return output;
+  });
+
+  toggler.connect_to(jsonify);
+
+  // print the JSON document to the serial console
+  jsonify->connect_to(new LambdaConsumer<String>(
+      [](String input) { debugD("JSONified output: %s", input.c_str()); }));
+
+  // connect jsonify to the SK delta queue
+
+  const char *sk_path = "environment.json.pin15";
+  jsonify->connect_to(new SKOutputRawJson(sk_path, ""));
+
+  sensesp_app->start();
+}
+
+void loop() { app.tick(); }