private void ModuleReceived(string resource, string contentType, byte[] message)
{
//received a message from subscription
try
{
MbapHeader header = MbapHeader.Decode(message);
diag?.PublishInput(header).GetAwaiter();
logger?.LogDebug("Diagnostics sent input.");
OnReceive?.Invoke(this, new ChannelReceivedEventArgs(channel.Id, message));
}
catch (Exception ex)
{
logger?.LogError(ex, "Unable to decode MBAP header module channel input.");
}
}
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.");
}
}
