public async Task <S7PlcBlocksCountAckDatagram> ReadBocksCountInfoAsync()
{
if (ConnectionState != ConnectionState.Opened)
{
ThrowHelper.ThrowNotConnectedException();
}
var id = GetNextReferenceId();
using (var dg = S7UserDataDatagram.TranslateToMemory(S7UserDataDatagram.BuildBlocksCountRequest(_s7Context, id), out var memoryLength))
{
using (var sendData = _transport.Build(dg.Memory.Slice(0, memoryLength), out var sendLength))
{
try
{
CallbackHandler <S7PlcBlocksCountAckDatagram> cbh;
S7PlcBlocksCountAckDatagram blockinfoResult = null;
using (await SemaphoreGuard.Async(_concurrentJobs).ConfigureAwait(false))
{
cbh = new CallbackHandler <S7PlcBlocksCountAckDatagram>(id);
_blocksCountHandler.TryAdd(cbh.Id, cbh);
try
{
if (await _transport.Connection.SendAsync(sendData.Memory.Slice(0, sendLength)).ConfigureAwait(false) != SocketError.Success)
{
return(null);
}
blockinfoResult = await cbh.Event.WaitAsync(_s7Context.Timeout).ConfigureAwait(false);
}
finally
{
_blocksCountHandler.TryRemove(cbh.Id, out _);
}
}
HandlerErrorResult(id, cbh, blockinfoResult);
return(blockinfoResult);
}
catch (TaskCanceledException)
{
ThrowHelper.ThrowTimeoutException();
}
}
}
return(null);
}
private void ReceivedS7PlcBlocksCountAckDatagram(Memory <byte> buffer)
{
var data = S7PlcBlocksCountAckDatagram.TranslateFromMemory(buffer);
if (_blocksCountHandler.TryGetValue(data.UserData.Header.ProtocolDataUnitReference, out var cbh))
{
if (data.UserData.Parameter.ParamErrorCode != 0)
{
_logger?.LogError("Error while reading blocks count for reference {0}. ParamErrorCode: {1}", data.UserData.Header.ProtocolDataUnitReference, data.UserData.Parameter.ParamErrorCode);
cbh.Exception = new Dacs7ParameterException(data.UserData.Parameter.ParamErrorCode);
cbh.Event.Set(null);
}
if (data.UserData.Data == null)
{
_logger?.LogWarning("No data from blocks count ack received for reference {0}", data.UserData.Header.ProtocolDataUnitReference);
}
cbh.Event.Set(data);
}
else
{
_logger?.LogWarning("No blocks data handler found for received read ack reference {0}", data.UserData.Header.ProtocolDataUnitReference);
}
}
