/// <summary>
/// Send a Mac SDU using context information. SrcAddr is automatically choosen.
/// </summary>
/// <param name="msdu">The frame to sent.</param>
/// <param name="context">Sent context. If null, frame is broadcasted</param>
private void MacDataRequestReal(
bool useExtAddr,
UInt16 nextHopAddrShort,
UInt64 nextHopAddrExt,
ref Frame sdu,
Byte sduHandle,
DataConfirmHandler handler)
{
// srcAddr: always use short addr when available
MacAddressingMode srcAddrMode = new MacAddressingMode();
if (_addrShort == cUnallocatedShortAddr)
srcAddrMode = MacAddressingMode.ExtendedAddress;
else
srcAddrMode = MacAddressingMode.ShortAddress;
MacAddress dstAddr = new MacAddress();
if (useExtAddr)
dstAddr.ExtendedAddress = nextHopAddrExt;
else
dstAddr.ShortAddress = nextHopAddrShort;
byte msduHandle;
Mac.DataConfirmHandler macHandler;
bool broadcast = (!useExtAddr) && IsMulticast(nextHopAddrShort);
if (!broadcast || handler != null)
{ // need a send context
MessageContext.Context context = _messageContext.GetFreeContext();
if (context == null)
{ // busy
if (handler != null)
handler.Invoke(_net, sduHandle, Status.Busy);
Frame.Release(ref sdu);
return;
}
context.useExtAddr = useExtAddr;
context.nextHopShort = nextHopAddrShort;
context.nextHopExt = nextHopAddrExt;
context.dataSduHandle = sduHandle;
context.dataHandler = handler;
macHandler = MacDataConfirmHandler;
msduHandle = context.macSduHandle;
}
else
{
macHandler = null;
msduHandle = MessageContext.cHandleDontCare;
}
TxOptions tx = new TxOptions();
if (!broadcast)
tx.AcknowledgedTransmission = true;
_mac.DataRequest(
srcAddrMode,
dstAddr,
_panId,
ref sdu,
msduHandle,
tx,
new SecurityOptions(),
macHandler);
Frame.Release(ref sdu);
}