/// <summary>
/// This method connects to the IoT Hub with the device identity.
/// by that it queries the authentication information for its module authentication
/// It then returns the Connection string by which the Module can perform authentication
/// </summary>
/// <returns>Connection String</returns>
public override string GetConnectionString()
{
JToken registrationToken = _dpsApi.GetDeviceRegistration(_idScope, _registrationId);
if (registrationToken == null)
{
throw new FailedToGetRegistrationException($"Registration ID: \"{_registrationId}\" for ID Scope: \"{_idScope}\" could not be retrieved");
}
string assignedHub = registrationToken["assignedHub"].ToString();
string deviceId = registrationToken["deviceId"].ToString();
string status = registrationToken["status"].ToString();
if (status != "assigned")
{
// TODO: handle error
}
_deviceAuthenticationData.GatewayHostName = assignedHub;
_deviceAuthenticationData.DeviceId = deviceId;
IDeviceApi deviceApi = new DevicesApi(RestClient.CreateFrom(_deviceAuthenticationData));
JToken moduleJToken = deviceApi.GetDeviceAgentModule(deviceId);
if (moduleJToken == null)
{
throw new FailedToGetModuleException($"Module for device: {deviceId} is empty");
}
//Note that the response represents the object Module in the SDK Microsoft.Azure.Devices
//We do not want to include the SDK in the project so we extract the specific parameters we need
string primaryKey = moduleJToken["authentication"]["symmetricKey"]["primaryKey"].ToString();
return(CreateModuleConnectionString(assignedHub, deviceId, primaryKey));
}
