var request = new RestSharp.RestRequest ("api/device/stats", RestSharp.Method.POST);
            request.AddHeader ("Content-Type", "application/json; charset=utf-8");

            request.RequestFormat = DataFormat.Json;
            request.AddBody(new AppUsageInfo {MAC = "ASDF"});
            RestSharp.IRestResponse response = client.Execute (request);
            var content = response.Content;

public string Post([FromUri]UsageLogModel usageState)
    {
        //LogFunction.AddUsageLogs(usageState);
        if (usageState.MAC == null)
            return "fail";
        else
            return "success";
    }

public class UsageLogModel
{
    public string MAC;
}