I have to register a device on IoT hub using DPS service. I cannot use the .net SDK as device firmware does not support so we decided to use the REST based API's to do the same.
With C# SDK all I need are the .PFX file with password, DPS_IDSCOPE and device endpoint something like this (xyz.azure-devices-provisioning.net).
Now How I can use above information to do the same with azure rest API.For Authentication I have seen below link which says I have to use SAS token for the same as Azure AD access token wont work.
Now If I trust on above link (However I do not think it will work ) then where is the use of certificate .PFX file ?
I have found this official API to register the device .
https://docs.microsoft.com/en-us/rest/api/iot-dps/runtimeregistration/registerdevice
I have not understand how to pass the body information like structure of JSON.I know I have to use x509 as Attestation type but how I will form is it like
var pairs = new List<KeyValuePair<string, string>>
{
new KeyValuePair<string, string>("registrationId", "device1"),
new KeyValuePair<string, string>("type", "x509"),
};
Or if its a json then what will be the name of attribute ?
Now below are the sample code that I tried to use and getting same error.
Way-1 (Used .PFX as authentication)
public static void RegisterDeviceWithEnrollementGroup()
{
try
{
var handler = new WebRequestHandler();
var certFile = Path.Combine(@"C:\IoT\", "device1.pfx");
handler.ClientCertificates.Add(new X509Certificate2(certFile, "certificatepassword"));
HttpClient client4 = new HttpClient(handler);
client4.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
client4.BaseAddress = new Uri("https://XYZ.azure-devices-provisioning.net/scopeid/registrations/device1/register?api-version=2018-11-01");
string content = Newtonsoft.Json.JsonConvert.SerializeObject(null);
var httpContent3 = new StringContent(content, Encoding.UTF8, "application/json");
var pairs = new List<KeyValuePair<string, string>>
{
new KeyValuePair<string, string>("registrationId", "device1"),
new KeyValuePair<string, string>("type", "x509"),
};
var content2 = new FormUrlEncodedContent(pairs);
HttpResponseMessage response4 = client4.PutAsync(client4.BaseAddress.ToString(), content2).Result;
var commandResult = string.Empty;
if (response4.IsSuccessStatusCode)
{
commandResult = response4.Content.ReadAsStringAsync().Result;
}
else
{
commandResult = response4.Content.ReadAsStringAsync().Result;
}
Console.WriteLine("IoT hub API call result - " + commandResult);
}
catch (Exception)
{
throw;
}
}
Way-2 - Using SAS token :
public static void RegisterDeviceWithEnrollementGroup()
{
try
{
HttpClient client4 = new HttpClient();
var sas = generateSasToken("XYZ.azure-devices-provisioning.net", "key", "provisioningserviceowner");
client4.DefaultRequestHeaders.Add("Authorization", sas);
client4.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
client4.BaseAddress = new Uri("https://XYZ.azure-devices-provisioning.net/scopeid/registrations/device1/register?api-version=2018-11-01");
string content = Newtonsoft.Json.JsonConvert.SerializeObject(null);
var httpContent3 = new StringContent(content, Encoding.UTF8, "application/json");
var pairs = new List<KeyValuePair<string, string>>
{
new KeyValuePair<string, string>("registrationId", "device1"),
new KeyValuePair<string, string>("type", "x509"),
};
var content2 = new FormUrlEncodedContent(pairs);
HttpResponseMessage response4 = client4.PutAsync(client4.BaseAddress.ToString(), content2).Result;
var commandResult = string.Empty;
if (response4.IsSuccessStatusCode)
{
commandResult = response4.Content.ReadAsStringAsync().Result;
}
else
{
commandResult = response4.Content.ReadAsStringAsync().Result;
}
Console.WriteLine("IoT hub API call result - " + commandResult);
}
catch (Exception)
{
throw;
}
}
Helper method :
public static string generateSasToken(string resourceUri, string key, string policyName, int expiryInSeconds = 3600)
{
TimeSpan fromEpochStart = DateTime.UtcNow - new DateTime(1970, 1, 1);
string expiry = Convert.ToString((int)fromEpochStart.TotalSeconds + expiryInSeconds);
string stringToSign = WebUtility.UrlEncode(resourceUri) + "\n" + expiry;
HMACSHA256 hmac = new HMACSHA256(Convert.FromBase64String(key));
string signature = Convert.ToBase64String(hmac.ComputeHash(Encoding.UTF8.GetBytes(stringToSign)));
string token = String.Format(CultureInfo.InvariantCulture, "SharedAccessSignature sr={0}&sig={1}&se={2}", WebUtility.UrlEncode(resourceUri), WebUtility.UrlEncode(signature), expiry);
if (!String.IsNullOrEmpty(policyName))
{
token += "&skn=" + policyName;
}
return token;
}
Now Please answer some body whether I am doing correct or wrong here as I am getting exception.
{StatusCode: 415, ReasonPhrase: 'Unsupported Media Type', Version: 1.1, Content: System.Net.Http.StreamContent, Headers: { x-ms-request-id: 6475343d-5a2e-407a-9e7f-896e0c489307 Strict-Transport-Security: max-age=31536000; includeSubDomains Date: Thu, 28 Feb 2019 11:42:59 GMT Content-Length: 0 }}
Looking forward for the help ...
