Get device twin in IoT Edge module

Hi all,

Currently, I would like to monitor the event about updating device’s desired property(not module twin). It seems doable, but how can I get device connection string in IoT Edge module? or is there any better way?

Below is my code in edge module

static string _deviceConnectionString = "***";
static DeviceClient _deviceClient = null;

//Monitor Device Twin
_deviceClient = DeviceClient.CreateFromConnectionString(_deviceConnectionString, TransportType.Mqtt);
Twin twin = await _deviceClient.GetTwinAsync();

private static async Task OnDeviceTwinDesiredPropertyChanged(TwinCollection desiredProperties, object userContext)
        {
            Console.WriteLine("\tDesired property changed:");
            Console.WriteLine($"\t{desiredProperties.ToJson()}");

            Console.WriteLine("\tSending current time as reported property");
            TwinCollection reportedProperties = new TwinCollection();
            reportedProperties["DateTimeLastDesiredPropertyChangeReceived"] = DateTime.Now;

            await _deviceClient.UpdateReportedPropertiesAsync(reportedProperties).ConfigureAwait(false);
        }

[FabGre]

Hi there, we also have scenarios where some device models, running modes(, …), should be shared between modules and it’s not really convenient to duplicate in each module twin… We have different edge device projects and we have always met this need. Thanks,

[danigian]

Same issue here. What if an edge device has metadata in its device twin, that a customer wants to use in device registry queries, that any given module wants to access? @varunpuranik what’s the suggested pattern here? Connection string in module twin is definitely not a way for production scenarios where a TPM is involved, neither it is the duplication of these metadata in every module twin.