Upload the data

src/main.cpp

@@ -4,6 +4,7 @@
 #include <WiFi.h>
 #include <WiFiMulti.h>
 #include <NTPClient.h>
+#include <HTTPClient.h>
 
 #include <LittleFS.h>
 
@@ -310,6 +311,32 @@ static void draw_epaper_callback(GxEPD2_DISPLAY_CLASS<GxEPD2_DRIVER_CLASS, MAX_H
 	display->print(" UTC");
 }
 
+static void upload_data(void)
+{
+	String json_string = String("{"
+			"\"scd30_co2\":") + scd30.CO2
+			+ ", \"scd30_temperature\":" + scd30.temperature
+			+ ", \"scd30_humidity\":" + scd30.relative_humidity + "}";
+
+	// send the data to graphite
+	HTTPClient client;
+	client.begin("http://stats.tkolb.de/sensor/sensorcube.php");
+	client.addHeader("Content-Type", "application/json");
+
+	int httpResponseCode = client.POST(json_string);
+
+	if(httpResponseCode>0) {
+		Serial.print("HTTP request result: ");
+		Serial.println(httpResponseCode);   //Print return code
+
+		//String response = http.getString();  //Get the response to the request
+		//Serial.println(response);           //Print request answer
+	} else {
+		Serial.print("Error on sending POST: ");
+		Serial.println(httpResponseCode);
+	}
+}
+
 void loop(void)
 {
 	static bool first_scd30_readout = true;
@@ -345,9 +372,14 @@ void loop(void)
 		Serial.println(" %");
 		Serial.println("");
 
+		Serial.println("\nUploading...");
+		upload_data();
+
 		if((now - lastEPaperRefresh) >= 60000) {
+			Serial.println("Rendering display...");
 			lastEPaperRefresh = now;
 			epaper_draw_and_hibernate(draw_epaper_callback, false);
+			Serial.println("Display updated.");
 
 			timeseries_prune(&ts_scd30_humidity, 3600); // keep the last hour
 		}