public byte[] GetJoinRequest()
{
//create a join request
byte[] AppEUI = LoRaDevice.GetAppEUI();
Array.Reverse(AppEUI);
byte[] DevEUI = LoRaDevice.GetDevEUI();
Array.Reverse(DevEUI);
byte[] DevNonce = new byte[2];
if ((LoRaDevice.DevNonce == "") || (!isFirstJoinRequest))
{
Random random = new Random();
// DevNonce[0] = 0xC8; DevNonce[1] = 0x86;
random.NextBytes(DevNonce);
LoRaDevice.DevNonce = BitConverter.ToString(DevNonce).Replace("-", "");
Array.Reverse(DevNonce);
isFirstJoinRequest = false;
}
else
{
DevNonce = LoRaDevice.GetDevNonce();
Array.Reverse(DevNonce);
}
Logger.Log(LoRaDevice.DevEUI, $"Join request sent DevNonce: {BitConverter.ToString(DevNonce).Replace("-","")}", Logger.LoggingLevel.Always);
var join = new LoRaPayloadJoinRequest(AppEUI, DevEUI, DevNonce);
join.SetMic(LoRaDevice.AppKey);
return(join.GetByteMessage());
}
public byte[] GetUnconfirmedDataUpMessage()
{
byte[] _mhbr = new byte[] { 0x40 };
byte[] _devAddr = LoRaDevice.GetDevAddr();
Array.Reverse(_devAddr);
byte[] _FCtrl = new byte[] { 0x80 };
// byte[] _FCnt = new byte[] { 0x00, 0x00 };
_FCnt[0]++;
byte[] _Fopts = null;
byte[] _FPort = new byte[] { 0x01 };
// Creating a random number
Random random = new Random();
int temp = random.Next(-50, 70);
Logger.Log(LoRaDevice.DevAddr, $"Simulated data: {temp.ToString()}", Logger.LoggingLevel.Always);
byte[] _payload = Encoding.ASCII.GetBytes(temp.ToString());
Array.Reverse(_payload);
// 0 = uplink, 1 = downlink
int direction = 0;
LoRaPayloadData standardData = new LoRaPayloadData(_mhbr, _devAddr, _FCtrl, _FCnt, _Fopts, _FPort, _payload, direction);
// Need to create Fops. If not, then MIC won't be correct
standardData.Fopts = new byte[0];
// First encrypt the data
standardData.PerformEncryption(LoRaDevice.AppSKey); //"0A501524F8EA5FCBF9BDB5AD7D126F75");
// Now we have the full package, create the MIC
standardData.SetMic(LoRaDevice.NwkSKey); //"99D58493D1205B43EFF938F0F66C339E");
return(standardData.GetByteMessage());
}
public SimulatedDevice(string json)
{
try
{
LoRaDevice = new LoRaDevice(json);
var additional = JsonConvert.DeserializeObject <JObject>(json);
Interval = (int)additional["Interval"];
FrmCntDown = (int)additional["FrmCntDown"];
FrmCntUp = (int)additional["FrmCntUp"];
//can store 32 bit but only 16 are sent
var fcnt32 = BitConverter.GetBytes(FrmCntDown);
_FCnt[0] = fcnt32[0];
_FCnt[1] = fcnt32[1];
}
catch (Exception)
{
if (LoRaDevice == null)
{
LoRaDevice = new LoRaDevice();
}
}
}
