/// <summary>
/// Set the basic header bytes for a packet
/// </summary>
private void SetHeader(SsmDirection direction, SsmCommand command)
{
this.data.Add(0x80);
if (direction == SsmDirection.ToEcu)
{
this.data.Add((byte)SsmDeviceType.SubaruEcu);
this.data.Add((byte)SsmDeviceType.DiagnosticTool);
}
else
{
this.data.Add((byte)SsmDeviceType.DiagnosticTool);
this.data.Add((byte)SsmDeviceType.SubaruEcu);
}
// placeholder for the length
this.data.Add(0);
this.data.Add((byte)command);
// Padding byte required for read requests
if (command == SsmCommand.ReadBlockRequest)
{
this.data.Add(0x00);
}
if (command == SsmCommand.ReadAddressesRequest)
{
this.data.Add(0x00);
}
}
/// <summary>
/// Create an ECU request packet with an arbitrary command and payload.
/// </summary>
/// <remarks>
/// For experimentation...
/// </remarks>
/// <param name="direction">Which direction the packet will be traveling.</param>
/// <param name="command">Command byte.</param>
/// <param name="payload">Payload.</param>
/// <returns>SsmPacket built from the given parameters.</returns>
public static SsmPacket CreateArbitrary(
SsmDirection direction,
SsmCommand command,
byte[] payload)
{
SsmPacket packet = new SsmPacket();
packet.SetHeader(direction, command);
packet.AppendPayload(payload);
packet.SetLengthByte();
packet.AppendChecksum();
return(packet);
}
