static void Main(string[] args)
{
// The Edge runtime gives us the connection string we need -- it is injected as an environment variable
string connectionString = Environment.GetEnvironmentVariable("EdgeHubConnectionString");
// Cert verification is not yet fully functional when using Windows OS for the container
bool bypassCertVerification = RuntimeInformation.IsOSPlatform(OSPlatform.Windows);
if (!bypassCertVerification)
{
InstallCert();
}
IoTEdgeModuleState state = null;
try
{
state = Init(connectionString, bypassCertVerification).GetAwaiter().GetResult();
}
catch (Exception ex)
{
Logger.Error("Error in the initialization", ex);
Environment.ExitCode = 1;
return;
}
// Wait until the app unloads or is cancelled
var cts = new CancellationTokenSource();
AssemblyLoadContext.Default.Unloading += (ctx) => cts.Cancel();
Console.CancelKeyPress += (sender, cpe) => cts.Cancel();
WhenCancelled(cts.Token).Wait();
}
/// <summary>
/// Initializes the DeviceClient and sets up the callback to receive
/// messages containing temperature information
/// </summary>
static async Task <IoTEdgeModuleState> Init(string connectionString, bool bypassCertVerification = false)
{
Logger.Log($"Connection String {connectionString}");
var state = new IoTEdgeModuleState()
{
ConnectionString = connectionString,
BypassCertVerification = bypassCertVerification,
};
// open connection to edge
var ioTHubModuleClient = await state.CreateAndOpenClient();
if (ioTHubModuleClient == null)
{
Logger.Error($"Could not connect to {state.ConnectionString}. Aborting");
}
Logger.Log($"IoT Hub module client initialized.");
await ioTHubModuleClient.SetMethodHandlerAsync("middlewarestatus", HandleStatusMethod, null);
Logger.Log($"Setup handing for method 'status'");
// Attach callback for Twin desired properties updates
await ioTHubModuleClient.SetDesiredPropertyUpdateCallbackAsync(onDesiredPropertiesUpdate, null);
Logger.Log($"Setup desired property update handler");
var twin = await ioTHubModuleClient.GetTwinAsync();
if (twin.Properties?.Desired?.Count > 0)
{
Logger.Log($"Twin desired has {twin.Properties?.Desired?.Count ?? 0} properties");
UpdateThreshold(twin.Properties.Desired);
}
// Resolve output name
outputName = Environment.GetEnvironmentVariable("OutputName");
if (string.IsNullOrEmpty(outputName))
{
outputName = "middlewareoutput";
}
;
Logger.Log($"IoT Hub module is outputting message '{outputName}'.");
// Register callback to be called when a message is received by the module
var inputName = Environment.GetEnvironmentVariable("InputName");
if (string.IsNullOrEmpty(inputName))
{
inputName = "sensor";
}
;
await ioTHubModuleClient.SetInputMessageHandlerAsync(inputName, HandleInputMessages, ioTHubModuleClient);
Logger.Log($"IoT Hub module is listening for input messages on '{inputName}'.");
return(state);
}
