async Task RunUdpListener()
{
IPEndPoint endPoint = new IPEndPoint(IPAddress.Any, PORT);
udpClient = new UdpClient(endPoint);
Console.WriteLine($"LoRaWAN server started on port {PORT}");
while (true)
{
UdpReceiveResult receivedResults = await udpClient.ReceiveAsync();
//Console.WriteLine($"UDP message received ({receivedResults.Buffer.Length} bytes) from port: {receivedResults.RemoteEndPoint.Port}");
//Todo check that is an ack only, we could do a better check in a future verstion
if (receivedResults.Buffer.Length == 12)
{
remoteLoRaAggregatorIp = receivedResults.RemoteEndPoint.Address;
remoteLoRaAggregatorPort = receivedResults.RemoteEndPoint.Port;
}
try
{
MessageProcessor messageProcessor = new MessageProcessor();
_ = messageProcessor.processMessage(receivedResults.Buffer);
}
catch (Exception ex)
{
Console.WriteLine($"Error processing the message {ex.Message}");
}
}
}
async Task RunUdpListener()
{
IPEndPoint endPoint = new IPEndPoint(IPAddress.Any, PORT);
udpClient = new UdpClient(endPoint);
Logger.Log($"LoRaWAN server started on port {PORT}", Logger.LoggingLevel.Always);
while (true)
{
UdpReceiveResult receivedResults = await udpClient.ReceiveAsync();
//Logger.Log($"UDP message received ({receivedResults.Buffer[3]}) from port: {receivedResults.RemoteEndPoint.Port} and IP: {receivedResults.RemoteEndPoint.Address.ToString()}",LoggingLevel.Always);
switch (PhysicalPayload.GetIdentifierFromPayload(receivedResults.Buffer))
{
//In this case we have a keep-alive PULL_DATA packet we don't need to start the engine and can return immediately a response to the challenge
case PhysicalIdentifier.PULL_DATA:
if (pullAckRemoteLoRaAggregatorPort == 0)
{
pullAckRemoteLoRaAggregatorPort = receivedResults.RemoteEndPoint.Port;
}
SendAcknowledgementMessage(receivedResults, (int)PhysicalIdentifier.PULL_ACK, receivedResults.RemoteEndPoint);
break;
//This is a PUSH_DATA (upstream message).
case PhysicalIdentifier.PUSH_DATA:
SendAcknowledgementMessage(receivedResults, (int)PhysicalIdentifier.PUSH_ACK, receivedResults.RemoteEndPoint);
// Message processing runs in the background
MessageProcessor messageProcessor = new MessageProcessor(this.configuration, this.loraDeviceInfoManager);
// do not wait for it to return
_ = Task.Run(async() => {
try
{
var resultMessage = await messageProcessor.ProcessMessageAsync(receivedResults.Buffer);
if (resultMessage != null && resultMessage.Length > 0)
{
var port = pullAckRemoteLoRaAggregatorPort;
if (port <= 0)
{
port = receivedResults.RemoteEndPoint.Port;
}
await this.UdpSendMessage(resultMessage, receivedResults.RemoteEndPoint.Address.ToString(), port);
}
}
catch (Exception ex)
{
Logger.Log($"Error processing the message {ex.Message}, {ex.StackTrace}", Logger.LoggingLevel.Error);
}
});
break;
//This is a ack to a transmission we did previously
case PhysicalIdentifier.TX_ACK:
if (receivedResults.Buffer.Length == 12)
{
Logger.Log(String.Format("Packet with id {0} successfully transmitted by the aggregator",
ConversionHelper.ByteArrayToString(receivedResults.Buffer.RangeSubset(1, 2)))
, LoggingLevel.Full);
}
else
{
Logger.Log(String.Format("Packet with id {0} had a problem to be transmitted over the air :{1}",
receivedResults.Buffer.Length > 2 ? ConversionHelper.ByteArrayToString(receivedResults.Buffer.RangeSubset(1, 2)) : "",
receivedResults.Buffer.Length > 12 ? Encoding.UTF8.GetString(receivedResults.Buffer.RangeSubset(12, receivedResults.Buffer.Length - 12)) : "")
, LoggingLevel.Error);
}
break;
default:
Logger.Log("Unknown packet type or length being received", LoggingLevel.Error);
break;
}
#pragma warning restore CS4014
}
}