public static int CreateRequest(ByteArray message, DataItem[] dataItems)
{
message.Add(Header.Template);
message[Header.Offsets.ParameterCount] = (byte)dataItems.Length;
var paramSize = dataItems.Length * Parameter.Template.Length;
Serialization.SetWordAt(message, Header.Offsets.ParameterSize,
(ushort)(2 + paramSize));
var paramOffset = Header.Template.Length;
var data = new ByteArray();
var itemCount = 0;
foreach (var item in dataItems)
{
itemCount++;
message.Add(Parameter.Template);
var value = Serialization.SerializeDataItem(item);
var wordLen = item.Value is bool? 1 : 2;
message[paramOffset + Parameter.Offsets.WordLength] = (byte)wordLen;
Serialization.SetWordAt(message, paramOffset + Parameter.Offsets.Amount, (ushort)value.Length);
Serialization.SetWordAt(message, paramOffset + Parameter.Offsets.DbNumber, (ushort)item.DB);
message[paramOffset + Parameter.Offsets.Area] = (byte)item.DataType;
data.Add(0x00);
if (item.Value is bool b)
{
if (item.BitAdr > 7)
{
throw new ArgumentException(
$"Cannot read bit with invalid {nameof(item.BitAdr)} '{item.BitAdr}'.", nameof(dataItems));
}
Serialization.SetAddressAt(message, paramOffset + Parameter.Offsets.Address, item.StartByteAdr,
item.BitAdr);
data.Add(0x03);
data.AddWord(1);
data.Add(b ? (byte)1 : (byte)0);
if (itemCount != dataItems.Length)
{
data.Add(0);
}
}
else
{
Serialization.SetAddressAt(message, paramOffset + Parameter.Offsets.Address, item.StartByteAdr, 0);
var len = value.Length;
data.Add(0x04);
data.AddWord((ushort)(len << 3));
data.Add(value);
if ((len & 0b1) == 1 && itemCount != dataItems.Length)
{
data.Add(0);
}
}
paramOffset += Parameter.Template.Length;
}
message.Add(data.Array);
Serialization.SetWordAt(message, Header.Offsets.MessageLength, (ushort)message.Length);
Serialization.SetWordAt(message, Header.Offsets.DataLength, (ushort)(message.Length - paramOffset));
return(message.Length);
}