/// <summary>
/// Code Performing the OTAA
/// </summary>
/// <param name="GatewayID"></param>
/// <param name="DevEUI"></param>
/// <param name="AppEUI"></param>
/// <param name="DevNonce"></param>
/// <returns></returns>
public static async Task <LoraDeviceInfo> PerformOTAAAsync(string GatewayID, string DevEUI, string AppEUI, string DevNonce, LoraDeviceInfo joinLoraDeviceInfo)
{
string AppSKey;
string NwkSKey;
string DevAddr;
string AppNonce;
IoTHubDeviceInfo iotHubDeviceInfo;
if (DevEUI == null || AppEUI == null || DevNonce == null)
{
string errorMsg = "Missing devEUI/AppEUI/DevNonce in the OTAARequest";
//log.Error(errorMsg);
Logger.Log(DevEUI, errorMsg, Logger.LoggingLevel.Error);
return(null);
}
if (joinLoraDeviceInfo == null)
{
joinLoraDeviceInfo = new LoraDeviceInfo();
}
joinLoraDeviceInfo.DevEUI = DevEUI;
////we don't have the key to access iot hub query the registry
//if (joinLoraDeviceInfo.PrimaryKey == null)
//{
Logger.Log(DevEUI, $"querying the registry for device key", Logger.LoggingLevel.Info);
var client = GetHttpClient();
var url = String.Concat($"{FacadeServerUrl}GetDevice?", $"{FacadeAuthCode}" == "" ? "" : $"code={FacadeAuthCode}&", $"DevEUI={DevEUI}&DevNonce={DevNonce}&GatewayId={GatewayID}");
HttpResponseMessage response = await client.GetAsync(url);
if (!response.IsSuccessStatusCode)
{
if (response.StatusCode == System.Net.HttpStatusCode.BadRequest)
{
var badReqResult = await response.Content.ReadAsStringAsync();
if (!String.IsNullOrEmpty(badReqResult) && badReqResult == "UsedDevNonce")
{
Logger.Log(DevEUI, $"DevNonce already used by this device", Logger.LoggingLevel.Info);
return(null);
}
}
Logger.Log(DevEUI, $"error calling façade api: {response.ReasonPhrase} check the azure function log", Logger.LoggingLevel.Error);
return(null);
}
var result = await response.Content.ReadAsStringAsync();
List <IoTHubDeviceInfo> iotHubDeviceInfos = ((List <IoTHubDeviceInfo>)JsonConvert.DeserializeObject(result, typeof(List <IoTHubDeviceInfo>)));
if (iotHubDeviceInfos.Count == 0)
{
joinLoraDeviceInfo.IsJoinValid = false;
joinLoraDeviceInfo.IsOurDevice = false;
return(joinLoraDeviceInfo);
}
else
{
iotHubDeviceInfo = iotHubDeviceInfos[0];
joinLoraDeviceInfo.PrimaryKey = iotHubDeviceInfo.PrimaryKey;
}
//}
joinLoraDeviceInfo.HubSender = new IoTHubConnector(joinLoraDeviceInfo.DevEUI, joinLoraDeviceInfo.PrimaryKey);
//we don't have yet the twin data so we need to get it
if (joinLoraDeviceInfo.AppKey == null || joinLoraDeviceInfo.AppEUI == null)
{
Logger.Log(DevEUI, $"getting twins for OTAA for device", Logger.LoggingLevel.Info);
var twin = await joinLoraDeviceInfo.HubSender.GetTwinAsync();
if (twin != null)
{
joinLoraDeviceInfo.IsOurDevice = true;
if (!twin.Properties.Desired.Contains("AppEUI"))
{
string errorMsg = $"missing AppEUI for OTAA for device";
Logger.Log(DevEUI, errorMsg, Logger.LoggingLevel.Error);
return(null);
}
else
{
joinLoraDeviceInfo.AppEUI = twin.Properties.Desired["AppEUI"].Value;
}
//Make sure that there is the AppKey if not we cannot do the OTAA
if (!twin.Properties.Desired.Contains("AppKey"))
{
string errorMsg = $"missing AppKey for OTAA for device";
Logger.Log(DevEUI, errorMsg, Logger.LoggingLevel.Error);
return(null);
}
else
{
joinLoraDeviceInfo.AppKey = twin.Properties.Desired["AppKey"].Value;
}
//Make sure that is a new request and not a replay
if (twin.Properties.Reported.Contains("DevNonce"))
{
joinLoraDeviceInfo.DevNonce = twin.Properties.Reported["DevNonce"];
}
if (twin.Properties.Desired.Contains("GatewayID"))
{
joinLoraDeviceInfo.GatewayID = twin.Properties.Desired["GatewayID"].Value;
}
if (twin.Properties.Desired.Contains("SensorDecoder"))
{
joinLoraDeviceInfo.SensorDecoder = twin.Properties.Desired["SensorDecoder"].Value;
}
Logger.Log(DevEUI, $"done getting twins for OTAA device", Logger.LoggingLevel.Info);
}
else
{
Logger.Log(DevEUI, $"failed getting twins for OTAA device", Logger.LoggingLevel.Error);
return(null);
}
}
else
{
Logger.Log(DevEUI, $"using cached twins for OTAA device", Logger.LoggingLevel.Info);
}
//We add it to the cache so the next join has already the data, important for offline
Cache.AddToCache(DevEUI, joinLoraDeviceInfo);
//Make sure that there is the AppEUI and it matches if not we cannot do the OTAA
if (joinLoraDeviceInfo.AppEUI != AppEUI)
{
string errorMsg = $"AppEUI for OTAA does not match for device";
Logger.Log(DevEUI, errorMsg, Logger.LoggingLevel.Error);
return(null);
}
//Make sure that is a new request and not a replay
if (!String.IsNullOrEmpty(joinLoraDeviceInfo.DevNonce) && joinLoraDeviceInfo.DevNonce == DevNonce)
{
string errorMsg = $"DevNonce already used by this device";
Logger.Log(DevEUI, errorMsg, Logger.LoggingLevel.Info);
joinLoraDeviceInfo.IsJoinValid = false;
return(joinLoraDeviceInfo);
}
//Check that the device is joining through the linked gateway and not another
if (!String.IsNullOrEmpty(joinLoraDeviceInfo.GatewayID) && joinLoraDeviceInfo.GatewayID.ToUpper() != GatewayID.ToUpper())
{
string errorMsg = $"not the right gateway device-gateway:{joinLoraDeviceInfo.GatewayID} current-gateway:{GatewayID}";
Logger.Log(DevEUI, errorMsg, Logger.LoggingLevel.Info);
joinLoraDeviceInfo.IsJoinValid = false;
return(joinLoraDeviceInfo);
}
byte[] netId = new byte[3] {
0, 0, 1
};
AppNonce = OTAAKeysGenerator.getAppNonce();
AppSKey = OTAAKeysGenerator.calculateKey(new byte[1] {
0x02
}, ConversionHelper.StringToByteArray(AppNonce), netId, ConversionHelper.StringToByteArray(DevNonce), ConversionHelper.StringToByteArray(joinLoraDeviceInfo.AppKey));
NwkSKey = OTAAKeysGenerator.calculateKey(new byte[1] {
0x01
}, ConversionHelper.StringToByteArray(AppNonce), netId, ConversionHelper.StringToByteArray(DevNonce), ConversionHelper.StringToByteArray(joinLoraDeviceInfo.AppKey));;
DevAddr = OTAAKeysGenerator.getDevAddr(netId);
joinLoraDeviceInfo.DevAddr = DevAddr;
joinLoraDeviceInfo.NwkSKey = NwkSKey;
joinLoraDeviceInfo.AppSKey = AppSKey;
joinLoraDeviceInfo.AppNonce = AppNonce;
joinLoraDeviceInfo.DevNonce = DevNonce;
joinLoraDeviceInfo.NetId = BitConverter.ToString(netId).Replace("-", "");;
//Accept the JOIN Request and the futher messages
joinLoraDeviceInfo.IsJoinValid = true;
return(joinLoraDeviceInfo);
}
