/// <summary>
/// This method is called whenever the module is sent a message from the EdgeHub.
/// It just pipe the messages without any change.
/// It prints all the incoming messages.
/// </summary>
static async Task <MessageResponse> PipeMessage(Message message, object userContext)
{
Console.WriteLine("pids18b20 - Received command");
int counterValue = Interlocked.Increment(ref counter);
DeviceClient deviceClient = (DeviceClient)userContext;
var userContextValues = userContext as Tuple <DeviceClient, Sensors.ModuleConfig>;
if (userContextValues == null)
{
throw new InvalidOperationException("UserContext doesn't contain " +
"expected values");
}
DeviceClient ioTHubModuleClient = userContextValues.Item1;
Sensors.ModuleConfig moduleConfig = userContextValues.Item2;
byte[] messageBytes = message.GetBytes();
string messageString = Encoding.UTF8.GetString(messageBytes);
Console.WriteLine($"Received message: {counterValue}, Body: [{messageString}]");
if (!string.IsNullOrEmpty(messageString))
{
var pipeMessage = new Message(messageBytes);
foreach (var prop in message.Properties)
{
pipeMessage.Properties.Add(prop.Key, prop.Value);
}
await deviceClient.SendEventAsync("output1", pipeMessage);
Console.WriteLine("Received message sent");
}
return(MessageResponse.Completed);
}
/// <summary>
/// Iterate through each sensor to poll data
/// </summary>
static async Task Start(object userContext)
{
var userContextValues = userContext as Tuple <DeviceClient, Sensors.ModuleConfig>;
if (userContextValues == null)
{
throw new InvalidOperationException("UserContext doesn't contain " +
"expected values");
}
DeviceClient ioTHubModuleClient = userContextValues.Item1;
Sensors.ModuleConfig moduleConfig = userContextValues.Item2;
while (m_run)
{
foreach (string s in moduleConfig.SensorConfigs.Keys)
{
SensorConfig sc = moduleConfig.SensorConfigs[s];
if (moduleConfig.VerboseLogging)
{
Console.WriteLine("Attempting to read sensor: " + sc);
}
SensorReading sensorReading = moduleConfig.ReadSensor(sc.SensorId);
if (moduleConfig.VerboseLogging)
{
Console.WriteLine("SensorReading:" + sensorReading);
}
Message message = null;
message = new Message(Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(sensorReading)));
message.Properties.Add("content-type", "application/edge-pids18b20-json");
message.ContentEncoding = "utf-8";
if (moduleConfig.VerboseLogging)
{
Console.Write("Sending message: " + message.BodyStream);
}
if (message != null)
{
await ioTHubModuleClient.SendEventAsync("pds18b20Output", message);
}
if (!m_run)
{
break;
}
}
await Task.Delay(1000 *moduleConfig.PublishIntervalSeconds);
}
}
public SensorReading(ModuleConfig mc, string sensorId)
{
SensorConfig sc = mc.SensorConfigs[sensorId];
PublishTimestamp = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");
SensorName = string.IsNullOrEmpty(sc.SensorName) ? ModuleConfigDefaults.DefaultSensorName : sc.SensorName;
UOM = string.IsNullOrEmpty(sc.UOM) ? ModuleConfigDefaults.DefaultSensorUOM : sc.UOM;
Temperature = -9999;
string sensorfile = mc.SensorDevicePath + sc.SensorId + mc.SensorDevicePathSuffix;
bool deviceReadOk = false;
if (mc.VerboseLogging)
{
Console.WriteLine("Opening file: " + sensorfile);
}
// Open the sensor file
string[] lines = { "NO", "READING=-9999" };
try
{
lines = System.IO.File.ReadAllLines(sensorfile);
deviceReadOk = true;
}
catch (Exception ex)
{
Console.WriteLine("Unable to read device file " + sensorfile + ": " + ex.Message);
}
if (deviceReadOk)
{
// DS18B20 device files have the following structure:
// Line 1: Status
// Line 2: Reading
// Status will be YES if the reading is valid, if it's not YES then we should report an error
// Reading takes the form of string=number, where number is the Celcius temperature in thousandths of a degree
if (lines[0].Contains("YES"))
{
string[] readingString = lines[1].Split('=');
float readingC1000 = Convert.ToSingle(readingString[1]);
Temperature = readingC1000 / (float)1000.0;
if (sc.UOM.Equals("F"))
{
Temperature = (float)32 + ((float)1.8 * Temperature);
}
}
}
}