/// <summary>
/// Note: caller msut hold the lock _lock
/// </summary>
/// <param name="dataRequestItem"></param>
private OutboundFragmentationMessage CreateNewOutboundMessage(DataRequestItem dataRequestItem)
{
byte messageSeqNumber;
uint timeoutForResending, maxFragmentsBeforeAck;
if (!_transmissionCharacteristicStorage.GetTransmissionCharacteristic(dataRequestItem.TargetShortAddr, out messageSeqNumber, out timeoutForResending, out maxFragmentsBeforeAck))
{
// characteristic not present. Create default one.
messageSeqNumber = 0;
timeoutForResending = FragmentationMessage.c_defaultTimeoutForResending;
maxFragmentsBeforeAck = FragmentationMessage.c_defaultMaxFragmentsBeforeAck;
_transmissionCharacteristicStorage.SetTransmissionCharacteristic(dataRequestItem.TargetShortAddr, messageSeqNumber, timeoutForResending, maxFragmentsBeforeAck);
}
else
{
// characteristic already present. increment the sequence number.
messageSeqNumber++;
if (messageSeqNumber == 0)
{
messageSeqNumber++;
} // sequence number = 0 is reserved for new communication
_transmissionCharacteristicStorage.SetTransmissionCharacteristic(dataRequestItem.TargetShortAddr, messageSeqNumber, timeoutForResending, maxFragmentsBeforeAck);
}
Frame sdu = dataRequestItem.Sdu;
OutboundFragmentationMessage newMsg = new OutboundFragmentationMessage(_localShortAddress,
dataRequestItem.TargetShortAddr, messageSeqNumber, _lowerLayerDataRequest,
ref sdu, dataRequestItem.SduHandle, dataRequestItem.Handler, _lowerMtu, _lowerHead, _lowerTail, _timer);
newMsg.FragmentationMessageTerminated += HandleFragmentationMessageTerminated;
newMsg.MaxFragmentsBeforeAck = maxFragmentsBeforeAck;
newMsg.TimeoutForResending = timeoutForResending;
_outboundAssociations.SetFragmentationMessage(_localShortAddress, dataRequestItem.TargetShortAddr, newMsg);
return(newMsg);
}
/// <summary>
/// Note: caller msut hold the lock _lock
/// </summary>
/// <param name="dataRequestItem"></param>
private OutboundFragmentationMessage CreateNewOutboundMessage(DataRequestItem dataRequestItem)
{
byte messageSeqNumber;
uint timeoutForResending, maxFragmentsBeforeAck;
if (!_transmissionCharacteristicStorage.GetTransmissionCharacteristic(dataRequestItem.TargetShortAddr, out messageSeqNumber, out timeoutForResending, out maxFragmentsBeforeAck))
{
// characteristic not present. Create default one.
messageSeqNumber = 0;
timeoutForResending = FragmentationMessage.c_defaultTimeoutForResending;
maxFragmentsBeforeAck = FragmentationMessage.c_defaultMaxFragmentsBeforeAck;
_transmissionCharacteristicStorage.SetTransmissionCharacteristic(dataRequestItem.TargetShortAddr, messageSeqNumber, timeoutForResending, maxFragmentsBeforeAck);
}
else
{
// characteristic already present. increment the sequence number.
messageSeqNumber++;
if (messageSeqNumber == 0) { messageSeqNumber++; } // sequence number = 0 is reserved for new communication
_transmissionCharacteristicStorage.SetTransmissionCharacteristic(dataRequestItem.TargetShortAddr, messageSeqNumber, timeoutForResending, maxFragmentsBeforeAck);
}
Frame sdu = dataRequestItem.Sdu;
OutboundFragmentationMessage newMsg = new OutboundFragmentationMessage(_localShortAddress,
dataRequestItem.TargetShortAddr, messageSeqNumber, _lowerLayerDataRequest,
ref sdu, dataRequestItem.SduHandle, dataRequestItem.Handler, _lowerMtu, _lowerHead, _lowerTail, _timer);
newMsg.FragmentationMessageTerminated += HandleFragmentationMessageTerminated;
newMsg.MaxFragmentsBeforeAck = maxFragmentsBeforeAck;
newMsg.TimeoutForResending = timeoutForResending;
_outboundAssociations.SetFragmentationMessage(_localShortAddress, dataRequestItem.TargetShortAddr, newMsg);
return newMsg;
}
public void DataRequest(ushort targetShortAddr, ref Frame sdu, byte sduHandle, DataConfirmHandler handler)
{
if (!_started)
{
if (handler != null)
{
handler.Invoke(this, sduHandle, Status.NotRunning);
}
return;
}
if (targetShortAddr == _localShortAddress)
{
// deliver frame to ourself
if (handler != null)
{
handler.Invoke(this, sduHandle, Status.Success);
}
DataIndicationHandler ind = _dataIndicationHandler;
if (ind != null)
{
ind.Invoke(this, targetShortAddr, targetShortAddr, sdu);
sdu = null;
}
return;
}
DataRequestItem newItem = new DataRequestItem(targetShortAddr, ref sdu, sduHandle, handler);
OutboundFragmentationMessage outMsg = null;
bool queueFull = false;
lock (_lock)
{
// check if one can send directly the message.
if (null == _outboundAssociations.GetFragmentationMessage(_localShortAddress, targetShortAddr))
{
outMsg = CreateNewOutboundMessage(newItem);
}
else
{
// there is already a message being sent to this address. Store to queue.
if (!_dataRequestQueueSet.Add(newItem))
{
queueFull = true;
}
}
}
// release the lock before calling method in FragmentMessage class
if (outMsg != null)
{
outMsg.SendNextDataFragment(true);
}
else if (queueFull)
{
// queue is full.
if (handler != null)
{
handler.Invoke(this, sduHandle, Status.Busy);
}
newItem.Dispose();
}
}