void Client::SendEmptyMessage(const Ip6::Address &aAddress, uint16_t aPort, uint16_t aMessageId, Header::Type aType)
{
Header header;
Ip6::MessageInfo messageInfo;
Message *message;
ThreadError error = kThreadError_None;
header.Init(aType, kCoapCodeEmpty);
header.SetMessageId(aMessageId);
VerifyOrExit((message = NewMessage(header)) != NULL, ;);
ThreadError Client::SendMessage(Message &aMessage, const Ip6::MessageInfo &aMessageInfo,
otCoapResponseHandler aHandler, void *aContext)
{
ThreadError error;
Header header;
RequestMetadata requestMetadata;
Message *storedCopy = NULL;
uint16_t copyLength = 0;
SuccessOrExit(error = header.FromMessage(aMessage));
// Set Message Id if it was not already set.
if (header.GetMessageId() == 0)
{
header.SetMessageId(mMessageId++);
aMessage.Write(0, Header::kMinHeaderLength, header.GetBytes());
}
if (header.IsConfirmable())
{
// Create a copy of entire message and enqueue it.
copyLength = aMessage.GetLength();
}
else if (header.IsNonConfirmable() && header.IsRequest() && (aHandler != NULL))
{
// As we do not retransmit non confirmable messages, create a copy of header only, for token information.
copyLength = header.GetLength();
}
if (copyLength > 0)
{
requestMetadata = RequestMetadata(header.IsConfirmable(), aMessageInfo, aHandler, aContext);
VerifyOrExit((storedCopy = CopyAndEnqueueMessage(aMessage, copyLength, requestMetadata)) != NULL,
error = kThreadError_NoBufs);
}
SuccessOrExit(error = mSocket.SendTo(aMessage, aMessageInfo));
exit:
if (error != kThreadError_None && storedCopy != NULL)
{
DequeueMessage(*storedCopy);
}
return error;
}