WIP: Limit number of datapoints client subscribes to

src/ism7mqtt/ISM7/Ism7Client.cs

@@ -3,6 +3,7 @@
 using System.Buffers.Binary;
 using System.Collections.Concurrent;
 using System.Collections.Generic;
+using System.Globalization;
 using System.IO;
 using System.IO.Pipelines;
 using System.Linq;
@@ -237,6 +238,35 @@ private static string HexEncode(ReadOnlySpan<byte> data)
  return s.ToString();
  }
 
+ #region Debug
+
+ private static int GetEnvInt32(string name, int defaultValue = default)
+ {
+ var value = Environment.GetEnvironmentVariable(name, EnvironmentVariableTarget.Process);
+ if (value is null) return defaultValue;
+ if (Int32.TryParse(value, NumberStyles.None, CultureInfo.InvariantCulture, out var parsed))
+ return parsed;
+ return defaultValue;
+ }
+
+ private int _subscriptionLimit = -1;
+
+ private int SubscriptionLimit
+ {
+ get
+ {
+ if (_subscriptionLimit < 0)
+ {
+ _subscriptionLimit = GetEnvInt32("ISM7_SUBSCR_LIMIT");
+ }
+ return _subscriptionLimit;
+ }
+ }
+
+ private int _subscriptionCount;
+
+ #endregion
+
  private async Task SubscribeAsync(string busAddress, CancellationToken cancellationToken)
  {
  var infoReads = _config.GetInfoReadForDevice(busAddress).ToList();
@@ -247,6 +277,20 @@ private async Task SubscribeAsync(string busAddress, CancellationToken cancellat
  infoRead.BusAddress = busAddress;
  infoRead.Intervall = Interval;
  }
+ if (SubscriptionLimit > 0)
+ {
+ int remaining = SubscriptionLimit - _subscriptionCount;
+ if (remaining == 0)
+ {
+ return;
+ }
+ if (remaining < infoReads.Count)
+ {
+ infoReads = infoReads.Take(remaining).ToList();
+ }
+ _subscriptionCount += infoReads.Count;
+ Console.WriteLine($"Total subscribed infopoints: {_subscriptionCount}");
+ }
  await SendAsync(new TelegramBundleReq
  {
  AbortOnError = false,

src/ism7mqtt/ISM7/Ism7Config.cs

@@ -91,7 +91,7 @@ public void AddDevice(string ip, string ba)
  public IEnumerable<InfoRead> GetInfoReadForDevice(string ba)
  {
  var devices = _devices[Converter.FromHex(ba)];
- return devices.SelectMany(x => x.InfoReads);
+ return devices.SelectMany(x => x.InfoReads).DistinctBy(ir => ir.InfoNumber);
  }
 
  public bool ProcessData(IEnumerable<InfonumberReadResp> data)