private static Task SendA(IChannelHandlerContext ctx, CCMessage data)
{
var coreframe = new CCMessage();
coreframe.Write(Magic);
coreframe.WriteScalar(data.Length);
coreframe.Write(data);
var buffer = Unpooled.Buffer(coreframe.Length);
buffer.WriteBytes(coreframe.Buffer);
ctx.WriteAndFlushAsyncEx(buffer).WaitEx();
return(Task.CompletedTask);
}