Xively GPS Location data upload V1

For one of the code club projects we looked at the National Marine Electronics Association (NMEA) 0183 output of my iteadStudio GPS Shield + Active Antenna. We used the NetMF Toolbox NMEA GPS processing code with a couple of modifications detailed here.

IteadStudio GPS

IteadStudio GPS shield and Antenna

For another project we had used Xively a “Public Cloud for the Internet of Things”. The Xively API has support for storing the position of a “thing” and it didn’t look like it would take much effort to extend the original GPS demo to trial this. The xively Location & waypoints API is RESTful and supports JSON & XML

void xivelyFeedUpdate(string ApiKey, string feedId, string channel, double latitude, double longitude, double altitude)
{
try
{
using (HttpWebRequest request = (HttpWebRequest)WebRequest.Create(xivelyApiBaseUrl + feedId + ".xml"))
{
StringBuilder payload = new StringBuilder();
payload.Append(@"<?xml version=""1.0"" encoding=""UTF-8""?><eeml><environment><location domain=""physical"" exposure=""outdoor"" disposition=""mobile""><name>Location</name><lat>");
payload.Append(latitude.ToString("F5"));
payload.Append("</lat><lon>");
payload.Append(longitude.ToString("F5"));
payload.Append("</lon><ele>");
payload.Append(altitude.ToString("F1"));
payload.Append("</ele></location></environment></eeml>");

byte[] buffer = Encoding.UTF8.GetBytes(payload.ToString());

request.Method = "PUT";
request.ContentLength = buffer.Length;
request.ContentType = "text/xml";
request.Headers.Add("X-ApiKey", xivelyApiKey);
request.KeepAlive = false;
request.Timeout = 5000;
request.ReadWriteTimeout = 5000;

// request body
using (Stream stream = request.GetRequestStream())
{
stream.Write(buffer, 0, buffer.Length);
}
using (var response = (HttpWebResponse)request.GetResponse())
{
Debug.Print("HTTP Status:" + response.StatusCode + " : " + response.StatusDescription);
}
}
}
catch (Exception ex)
{
Debug.Print(ex.Message);
}
}

The position of the “thing” is displayed like this

Xively poisition

The position of my car

The XML was constructed using a stringbuilder (NetMF 4.2) as this appeared easier/smaller than using the baked in XML functionality.

2 thoughts on “Xively GPS Location data upload V1

  1. Pingback: Xively GPS Location data upload V2 | devMobile's blog

  2. Pingback: Code Camp Christchurch 2014 | devMobile's blog

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