/// <summary>
///
/// </summary>
/// <returns>Last light level from ThingSpeak sent by light sensor (actually sent by Arduino or some other microcontroller that read the value (actually sent by Ethernet or WIFI shield/chip that got the data from microcontroler (actually... nvm))) </returns>
private int GetLastLightLevel()
{
String url = BaseUrl + "/channels/%CHANNEL%/feeds.xml?results=1"
.Replace("%CHANNEL%", Channel);
WebClient webClient = new WebClient()
{
Encoding = Encoding.UTF8
};
String xmlString = webClient.DownloadString(url);
xmlString = xmlString.Replace("<feed>", "<feed id=\"feed\">"); // That way we are avoiding traversing the xml tree which results in a shorter code. We can do it because we retrieve only the last feed
XmlDocument xml = new XmlDocument();
xml.LoadXml(xmlString);
XmlElement feed = ConfigurationFile.GetFirstElementById(xml, "feed");
XmlNode lightValueNode = feed.ChildNodes[2]; // We know that the light level is stored at third position
String lightValueString = lightValueNode.InnerText;
return(int.Parse(lightValueString));
}
