public async Task Process(UdpReceiveResult message, UdpClient client)
{
var now = DateTime.UtcNow;
try {
switch (_semtech.GetIdentifier(message.Buffer))
{
case Identifier.PUSH_DATA:
Log.Info(log, "PUSH_DATA from " + message.RemoteEndPoint.Address.ToString() + ":" + message.RemoteEndPoint.Port.ToString(), now);
var pushdata = _semtech.UnmarshalPushData(message.Buffer);
IPEndPoint ep = null;
Broker broker = null;
if (_gateways.TryGetValue(ByteArrayToString(pushdata.GatewayMACAddress), out ep))
{
var pushack = _semtech.MarshalPushAck(pushdata.RandomToken);
client.SendAsync(pushack, pushack.Length, ep);
Log.Info(log, "PUSH_ACK to " + ep.Address.ToString() + ":" + ep.Port.ToString(), now);
foreach (var rxpk in pushdata.Json.Rxpks)
{
var data = Convert.FromBase64String(rxpk.Data);
switch (_lora.GetMType(data[0]))
{
case MType.JoinRequest:
var joinrequest = _lora.UnmarshalJoinRequest(data);
broker = await _brokerclient.GetBrokerOnAppEUI(ByteArrayToString(joinrequest.AppEUI));
var joinaccept = await _brokerclient.SendMessage(broker.Endpoint, new Message()
{
Rxpk = rxpk
});
var pullresp = _semtech.MarshalPullResp(new PullResp()
{
ProtocolVersion = 1,
Identifier = Identifier.PULL_RESP,
Txpk = joinaccept.Txpk
});
client.SendAsync(pullresp, pullresp.Length, ep);
Log.Info(log, "PULL_RESP to " + ep.Address.ToString() + ":" + ep.Port.ToString(), now);
break;
case MType.ConfirmedDataUp:
// TODO
var confirmeddataup = _lora.UnmarshalUnconfirmedDataUp(data);
broker = await _brokerclient.GetBrokerOnDevAddr(ByteArrayToString(_lora.MarshalDevAddr(confirmeddataup.Fhdr.DevAddr)));
await _brokerclient.SendMessage(broker.Endpoint, new Message()
{
Rxpk = rxpk
});
break;
case MType.UnconfirmedDataUp:
var unconfirmeddataup = _lora.UnmarshalUnconfirmedDataUp(data);
broker = await _brokerclient.GetBrokerOnDevAddr(ByteArrayToString(_lora.MarshalDevAddr(unconfirmeddataup.Fhdr.DevAddr)));
await _brokerclient.SendMessage(broker.Endpoint, new Message()
{
Rxpk = rxpk
});
break;
}
}
}
break;
case Identifier.PULL_DATA:
Log.Info(log, "PULL_DATA from " + message.RemoteEndPoint.Address.ToString() + ":" + message.RemoteEndPoint.Port.ToString(), now);
var pulldata = _semtech.UnmarshalPullData(message.Buffer);
_gateways[ByteArrayToString(pulldata.GatewayMACAddress)] = message.RemoteEndPoint;
var pullack = _semtech.MarshalPullAck(pulldata.RandomToken);
client.SendAsync(pullack, pullack.Length, message.RemoteEndPoint);
Log.Info(log, "PULL_ACK to " + message.RemoteEndPoint.Address.ToString() + ":" + message.RemoteEndPoint.Port.ToString(), now);
break;
}
}
catch (Exception e) {
Log.Error(log, e.Message, now, e);
}
}
public async Task <byte[]> ProcessJoinRequest(byte[] data)
{
byte[] returnvalue;
try {
await _dal.BeginTransaction();
var joinrequest = _lora.UnmarshalJoinRequest(data);
var device = await _dal.GetDeviceOnAppEUIDevEUI(ByteArrayToString(joinrequest.AppEUI), ByteArrayToString(joinrequest.DevEUI));
var appkey = StringToByteArray(device.AppKey);
var joinrequestvalidated = _lora.UnmarshalJoinRequestAndValidate(appkey, data);
var devnonce = ByteArrayToString(joinrequestvalidated.DevNonce);
if ((await _dal.GetSessionOnDeviceDevNonceActive(device.Id, devnonce)) != null)
{
throw new SessionAllreadyActiveException();
}
var nwkid = GetNwkId();
var freedevaddr = await _dal.GetFreeDevAddr(nwkid);
var appnonce = _lora.GetAppNonce();
var netid = GetNetId();
await _dal.SetActiveSessionsInactive(device.Id);
await _dal.AddSession(new Com.Bekijkhet.MyBroker.Dal.Session()
{
Device = device.Id,
DevAddr = freedevaddr.Id,
DevNonce = devnonce,
AppNonce = ByteArrayToString(appnonce),
NwkSKey = ByteArrayToString(_lora.GetNwkSKey(appkey, appnonce, netid, joinrequestvalidated.DevNonce)),
AppSKey = ByteArrayToString(_lora.GetAppSKey(appkey, appnonce, netid, joinrequestvalidated.DevNonce)),
Active = DateTime.UtcNow.AddDays(1)
});
var joinaccept = new JoinAccept()
{
Mhdr = new Mhdr()
{
MType = MType.JoinAccept, Major = 1
},
AppNonce = appnonce,
NetId = netid,
DevAddr = Convert.ToUInt32((freedevaddr.NwkId * 16777216) + freedevaddr.NwkAddr),
DlSettings = GetDlSettings(),
RxDelay = GetRxDelay(),
CfList = GetCfList()
};
returnvalue = _lora.MarshalJoinAccept(joinaccept, appkey);
_dal.CommitTransaction();
}
catch (Exception e) {
_dal.RollbackTransaction();
throw;
}
finally {
_dal.Close();
}
return(returnvalue);
}