public override async Task <byte[]> SendMsgAsync(byte[] message)
{
try
{
var pos = 0;
var protocal = BigEndianValueHelper.Instance.GetByte(message, ref pos);
if (protocal == 0)
{
byte[] tagBytes = new byte[message.Length - 1];
Array.Copy(message, 1, tagBytes, 0, tagBytes.Length);
string tag = Encoding.UTF8.GetString(tagBytes);
var result = await _daClient.ReadAsync(tag);
if (result.QualityGood)
{
return(BigEndianValueHelper.Instance.GetBytes(result.Value, result.Value.GetType()));
}
else
{
return(Encoding.ASCII.GetBytes("NoData"));
}
}
else
{
int index = 0;
for (int i = 1; i < message.Length - 3; i++)
{
if (message[i] == 0x00 && message[i + 1] == 0xff && message[i + 2] == 0xff &&
message[i + 3] == 0x00)
{
index = i;
break;
}
}
int index2 = 0;
for (int i = index + 4; i < message.Length - 3; i++)
{
if (message[i] == 0x00 && message[i + 1] == 0xff && message[i + 2] == 0xff &&
message[i + 3] == 0x00)
{
index = i;
break;
}
}
byte[] tagBytes = new byte[index - 1];
Array.Copy(message, 1, tagBytes, 0, tagBytes.Length);
string tag = Encoding.UTF8.GetString(tagBytes);
byte[] typeBytes = new byte[index2 - index - 4];
Array.Copy(message, index + 4, typeBytes, 0, typeBytes.Length);
Type type = Type.GetType(Encoding.UTF8.GetString(typeBytes));
byte[] valueBytes = new byte[message.Length - index2 - 4];
Array.Copy(message, index2 + 4, valueBytes, 0, valueBytes.Length);
int mainpos = 0, subpos = 0;
object value = BigEndianValueHelper.Instance.GetValue(valueBytes, ref mainpos, ref subpos, type);
await _daClient.WriteAsync(tag, value);
return(new byte[] { 1 });
}
}
catch (Exception e)
{
//AddInfo("opc client exception:" + e);
return(Encoding.ASCII.GetBytes("NoData"));
//return null;
}
}
