// INSERT SetFanState method below here
// Handle the direct method call
private static Task <MethodResponse> SetFanState(MethodRequest methodRequest, object userContext)
{
if (cheeseCave.FanState == StateEnum.Failed)
{
// Acknowledge the direct method call with a 400 error message.
string result = "{\"result\":\"Fan failed\"}";
ConsoleHelper.WriteRedMessage("Direct method failed: " + result);
return(Task.FromResult(new MethodResponse(Encoding.UTF8.GetBytes(result), 400)));
}
else
{
try
{
var data = Encoding.UTF8.GetString(methodRequest.Data);
// Remove quotes from data.
data = data.Replace("\"", "");
// Parse the payload, and trigger an exception if it's not valid.
cheeseCave.UpdateFan((StateEnum)Enum.Parse(typeof(StateEnum), data));
ConsoleHelper.WriteGreenMessage("Fan set to: " + data);
// Acknowledge the direct method call with a 200 success message.
string result = "{\"result\":\"Executed direct method: " + methodRequest.Name + "\"}";
return(Task.FromResult(new MethodResponse(Encoding.UTF8.GetBytes(result), 200)));
}
catch
{
// Acknowledge the direct method call with a 400 error message.
string result = "{\"result\":\"Invalid parameter\"}";
ConsoleHelper.WriteRedMessage("Direct method failed: " + result);
return(Task.FromResult(new MethodResponse(Encoding.UTF8.GetBytes(result), 400)));
}
}
}
// UNCOMMENT SetFanState method below here
// This method that runs on the device when the associated remote method,
// also called SetFanState, is invoked via IoT Hub. Notice that in
// addition to receiving a MethodRequest instance, it also receives the
// userContext object that was defined when the direct message callback
// was registered (in this case it will be null)
private static Task <MethodResponse> SetFanState(MethodRequest methodRequest, object userContext)
{
// The first line of this method determines whether the cheese cave
// fan is currently in a Failed state - the assumption made by the
// cheese cave simulator is that once the fan has failed, any
// subsequent command will automatically fail.
if (cheeseCave.FanState == StateEnum.Failed)
{
// Acknowledge the direct method call with a 400 error message.
// a JSON string is created with the result property set to Fan
// Failed
string result = "{\"result\":\"Fan failed\"}";
// A new MethodResponse object is then constructed, with the
// result string encoded into a byte array and an HTTP status
// code - in this instance, 400 is used which, in the context of
// a REST API means a generic client-side error has occurred.
ConsoleHelper.WriteRedMessage("Direct method failed: " + result);
// As direct method callbacks are required to return a
// Task<MethodResponse>, a new task is created and returned.
return(Task.FromResult(new MethodResponse(Encoding.UTF8.GetBytes(result), 400)));
}
else
{
// If the fan state is not Failed, the code then proceeds to
// process the data sent as part of the method request.
try
{
// The methodRequest.Data property contains the data in the
// form of a byte array, so it is first converted to a string.
var data = Encoding.UTF8.GetString(methodRequest.Data);
// In order to parse the data, the quotes must first be
// removed and then the Enum.Parse method is used to find a
// matching enum value.
data = data.Replace("\"", "");
// Parse the payload, and trigger an exception if it's not valid.
cheeseCave.UpdateFan((StateEnum)Enum.Parse(typeof(StateEnum), data));
ConsoleHelper.WriteGreenMessage("Fan set to: " + data);
// Acknowledge the direct method call with a 200 success message.
string result = "{\"result\":\"Executed direct method: " + methodRequest.Name + "\"}";
return(Task.FromResult(new MethodResponse(Encoding.UTF8.GetBytes(result), 200)));
}
catch
{
// Acknowledge the direct method call with a 400 error message.
// Notice that the exception handler creates and returns a
// similar error method response to the one created for the
// fan failed state.
string result = "{\"result\":\"Invalid parameter\"}";
ConsoleHelper.WriteRedMessage("Direct method failed: " + result);
return(Task.FromResult(new MethodResponse(Encoding.UTF8.GetBytes(result), 400)));
}
}
}