private async Task UpdateRtuMapAsync(ContainerEntity entity, string connectionString, string container, string filename)
{
RtuMap map = await RtuMap.LoadAsync(connectionString, container, filename);
map = map ?? new RtuMap();
map.Name = map.Name ?? entity.VirtualRtuId;
foreach (var slave in entity.Slaves)
{
if (map.HasItem(slave.UnitId))
{
map.Remove(slave.UnitId);
}
string requestUriString = UriGenerator.GetRtuPiSystem(entity.Hostname, entity.VirtualRtuId, entity.DeviceId, slave.UnitId, true);
string responseUriString = UriGenerator.GetRtuPiSystem(entity.Hostname, entity.VirtualRtuId, entity.DeviceId, slave.UnitId, false);
if (slave.Constraints != null && slave.Constraints.Count == 0)
{
slave.Constraints = null;
}
map.Add(slave.UnitId, requestUriString, responseUriString, slave.Constraints);
}
await map.UpdateAsync(connectionString, container, filename);
}
private void Input_OnReceive(object sender, ChannelReceivedEventArgs e)
{
MbapHeader header = MbapHeader.Decode(e.Message);
if (header == null)
{
logger?.LogWarning("MBAP Header returned null");
return; //assume keep alive
}
if (!map.HasItem(header.UnitId))
{
byte[] errorMsg = ModbusErrorMessage.Create(e.Message, ErrorCode.GatewayPathsNotAvailable);
this.InputChannel.SendAsync(errorMsg).GetAwaiter();
return;
}
if (!map.GetItem(header.UnitId).Authorize(e.Message))
{
byte[] errorMsg = ModbusErrorMessage.Create(e.Message, ErrorCode.IllegalAddress);
this.InputChannel.SendAsync(errorMsg).GetAwaiter();
return;
}
byte[] message = e.Message;
byte[] msg = null;
foreach (var filter in InputFilters)
{
msg = filter.Execute(message);
msg ??= message;
}
OutputChannel.SendAsync(msg).GetAwaiter();
}
public async Task SendAsync(byte[] message)
{
if (client == null || !client.IsConnected)
{
logger?.LogWarning("MQTT client is not available to forward message.");
return;
}
try
{
MbapHeader header = MbapHeader.Decode(message);
if (map.HasItem(header.UnitId))
{
if (!subscriptions.Contains(header.UnitId))
{
string resource = map.GetItem(header.UnitId).RtuOutputEvent;
await client.SubscribeAsync(resource, QualityOfServiceLevelType.AtMostOnce,
ModbusMessageReceived);
logger?.LogInformation(
$"MQTT client channel subscribed {resource} with Unit ID = {header.UnitId}");
subscriptions.Add(header.UnitId);
}
cache.Add(GetCacheKey(header), new Tuple <ushort, byte[]>(header.TransactionId, message), 20.0);
string pisystem = map.GetItem(header.UnitId).RtuInputEvent;
await client.PublishAsync(QualityOfServiceLevelType.AtMostOnce, pisystem,
"application/octet-stream", message);
logger?.LogDebug($"VRTU published to {pisystem}");
await diag?.PublishInput(header);
}
else
{
logger?.LogWarning($"Unit Id = {header.UnitId} in Modbus message not found in RTU map.");
}
}
catch (Exception ex)
{
logger?.LogError(ex, "Fault sending MQTT client channel.");
}
}
