private void ProcessDatagramHeaders(byte[] datagram)
{
// HEADER
// TODO: Might be interesting to take out these magic numbers for the datagram indices
var knxDatagram = new KnxDatagram
{
header_length = datagram[0],
protocol_version = datagram[1],
service_type = new[] { datagram[2], datagram[3] },
total_length = datagram[4] + datagram[5]
};
var channelId = datagram[7];
if (channelId != ChannelId)
{
return;
}
var sequenceNumber = datagram[8];
_rxSequenceNumber = sequenceNumber;
var cemi = new byte[datagram.Length - 10];
Array.Copy(datagram, 10, cemi, 0, datagram.Length - 10);
SendTunnelingAck(sequenceNumber);
ProcessCEMI(knxDatagram, cemi);
}
private void ProcessConnectResponse(byte[] datagram)
{
// HEADER
var knxDatagram = new KnxDatagram
{
header_length = datagram[0],
protocol_version = datagram[1],
service_type = new[] { datagram[2], datagram[3] },
total_length = datagram[4] + datagram[5],
channel_id = datagram[6],
status = datagram[7]
};
if (knxDatagram.channel_id == 0x00 && knxDatagram.status == 0x24)
{
Logger.Log("ProcessConnectResponse: - No more connections available");
ErrorLog.Error("ProcessConnectResponse - No more connections available");
Disconnect();
}
else
{
ChannelId = knxDatagram.channel_id;
ResetSequenceNumber();
stateRequestTimer.Reset(stateRequestTimerInterval);
if (OnConnect != null)
{
OnConnect();
}
}
}
private void ProcessConnectionStateResponse(byte[] datagram)
{
// HEADER
// 06 10 02 08 00 08 -- 48 21
var knxDatagram = new KnxDatagram
{
header_length = datagram[0],
protocol_version = datagram[1],
service_type = new[] { datagram[2], datagram[3] },
total_length = datagram[4] + datagram[5],
channel_id = datagram[6]
};
var response = datagram[7];
if (response == 0)
{
Alive = true;
return;
}
if (response == 0x21)
{
Logger.Log("ProcessConnectionStateResponse - No active connection with channel ID {0}", knxDatagram.channel_id);
}
else
{
Logger.Log("ProcessConnectionStateResponse - Error code {0}", response);
}
Disconnect();
}
private void BuildAndExecuteKnxRx(KnxDatagram datagram)
{
string data = string.Empty;
if (datagram.data_length == 1)
{
int bitval = datagram.apdu[1] & 0x3F;
data = bitval.ToString("X2");
}
else
{
data = BitConverter.ToString(datagram.apdu, 2).Replace("-", string.Empty);
}
data = datagram.destination_address + ":" +
datagram.data_length + ":" + data;
Pacer.EnqueueRX(data);
}
protected void ProcessCEMI(KnxDatagram datagram, byte[] cemi)
{
try
{
// CEMI
// +--------+--------+--------+--------+----------------+----------------+--------+----------------+
// | Msg |Add.Info| Ctrl 1 | Ctrl 2 | Source Address | Dest. Address | Data | APDU |
// | Code | Length | | | | | Length | |
// +--------+--------+--------+--------+----------------+----------------+--------+----------------+
// 1 byte 1 byte 1 byte 1 byte 2 bytes 2 bytes 1 byte 2 bytes
//
// Message Code = 0x11 - a L_Data.req primitive
// COMMON EMI MESSAGE CODES FOR DATA LINK LAYER PRIMITIVES
// FROM NETWORK LAYER TO DATA LINK LAYER
// +---------------------------+--------------+-------------------------+---------------------+------------------+
// | Data Link Layer Primitive | Message Code | Data Link Layer Service | Service Description | Common EMI Frame |
// +---------------------------+--------------+-------------------------+---------------------+------------------+
// | L_Raw.req | 0x10 | | | |
// +---------------------------+--------------+-------------------------+---------------------+------------------+
// | | | | Primitive used for | Sample Common |
// | L_Data.req | 0x11 | Data Service | transmitting a data | EMI frame |
// | | | | frame | |
// +---------------------------+--------------+-------------------------+---------------------+------------------+
// | L_Poll_Data.req | 0x13 | Poll Data Service | | |
// +---------------------------+--------------+-------------------------+---------------------+------------------+
// | L_Raw.req | 0x10 | | | |
// +---------------------------+--------------+-------------------------+---------------------+------------------+
// FROM DATA LINK LAYER TO NETWORK LAYER
// +---------------------------+--------------+-------------------------+---------------------+
// | Data Link Layer Primitive | Message Code | Data Link Layer Service | Service Description |
// +---------------------------+--------------+-------------------------+---------------------+
// | L_Poll_Data.con | 0x25 | Poll Data Service | |
// +---------------------------+--------------+-------------------------+---------------------+
// | | | | Primitive used for |
// | L_Data.ind | 0x29 | Data Service | receiving a data |
// | | | | frame |
// +---------------------------+--------------+-------------------------+---------------------+
// | L_Busmon.ind | 0x2B | Bus Monitor Service | |
// +---------------------------+--------------+-------------------------+---------------------+
// | L_Raw.ind | 0x2D | | |
// +---------------------------+--------------+-------------------------+---------------------+
// | | | | Primitive used for |
// | | | | local confirmation |
// | L_Data.con | 0x2E | Data Service | that a frame was |
// | | | | sent (does not mean |
// | | | | successful receive) |
// +---------------------------+--------------+-------------------------+---------------------+
// | L_Raw.con | 0x2F | | |
// +---------------------------+--------------+-------------------------+---------------------+
// Add.Info Length = 0x00 - no additional info
// Control Field 1 = see the bit structure above
// Control Field 2 = see the bit structure above
// Source Address = 0x0000 - filled in by router/gateway with its source address which is
// part of the KNX subnet
// Dest. Address = KNX group or individual address (2 byte)
// Data Length = Number of bytes of data in the APDU excluding the TPCI/APCI bits
// APDU = Application Protocol Data Unit - the actual payload including transport
// protocol control information (TPCI), application protocol control
// information (APCI) and data passed as an argument from higher layers of
// the KNX communication stack
//
datagram.message_code = cemi[0];
datagram.aditional_info_length = cemi[1];
if (datagram.aditional_info_length > 0)
{
datagram.aditional_info = new byte[datagram.aditional_info_length];
for (var i = 0; i < datagram.aditional_info_length; i++)
{
datagram.aditional_info[i] = cemi[2 + i];
}
}
datagram.control_field_1 = cemi[2 + datagram.aditional_info_length];
datagram.control_field_2 = cemi[3 + datagram.aditional_info_length];
datagram.source_address = KnxHelper.GetIndividualAddress(new[] { cemi[4 + datagram.aditional_info_length], cemi[5 + datagram.aditional_info_length] });
datagram.destination_address =
KnxHelper.GetKnxDestinationAddressType(datagram.control_field_2).Equals(KnxHelper.KnxDestinationAddressType.INDIVIDUAL)
? KnxHelper.GetIndividualAddress(new[] { cemi[6 + datagram.aditional_info_length], cemi[7 + datagram.aditional_info_length] })
: KnxHelper.GetGroupAddress(new[] { cemi[6 + datagram.aditional_info_length], cemi[7 + datagram.aditional_info_length] },
true);
datagram.data_length = cemi[8 + datagram.aditional_info_length];
datagram.apdu = new byte[datagram.data_length + 1];
for (var i = 0; i < datagram.apdu.Length; i++)
{
datagram.apdu[i] = cemi[9 + i + datagram.aditional_info_length];
}
datagram.data = KnxHelper.GetData(datagram.data_length, datagram.apdu);
Logger.Log("-----------------------------------------------------------------------------------------------------");
Logger.Log(BitConverter.ToString(cemi));
Logger.Log("Event Header Length: " + datagram.header_length);
Logger.Log("Event Protocol Version: " + datagram.protocol_version.ToString("x"));
Logger.Log("Event Service Type: 0x" + BitConverter.ToString(datagram.service_type).Replace("-", string.Empty));
Logger.Log("Event Total Length: " + datagram.total_length);
Logger.Log("Event Message Code: " + datagram.message_code.ToString("x"));
Logger.Log("Event Aditional Info Length: " + datagram.aditional_info_length);
if (datagram.aditional_info_length > 0)
{
Logger.Log("Event Aditional Info: 0x" + BitConverter.ToString(datagram.aditional_info).Replace("-", string.Empty));
}
Logger.Log("Event Control Field 1: " + Convert.ToString(datagram.control_field_1, 2));
Logger.Log("Event Control Field 2: " + Convert.ToString(datagram.control_field_2, 2));
Logger.Log("Event Source Address: " + datagram.source_address);
Logger.Log("Event Destination Address: " + datagram.destination_address);
Logger.Log("Event Data Length: " + datagram.data_length);
Logger.Log("Event APDU: 0x" + BitConverter.ToString(datagram.apdu).Replace("-", string.Empty));
Logger.Log("-----------------------------------------------------------------------------------------------------");
if (datagram.message_code != 0x29)
{
return;
}
var type = datagram.apdu[1] >> 4;
switch (type)
{
case 8:
BuildAndExecuteKnxRx(datagram);
Logger.Log("{0}", datagram.source_address);
break;
case 4:
BuildAndExecuteKnxRx(datagram);
Logger.Log("Device {0} status {1}", datagram.source_address, datagram.destination_address);
break;
}
}
catch (Exception e)
{
Logger.Log("ProcessCEMI: {0}", e.Message);
}
}