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###############################################################################
#
# Temboo CoAP Edge Device library
#
# Copyright (C) 2017, Temboo Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
# either express or implied. See the License for the specific
# language governing permissions and limitations under the License.
#
###############################################################################
*/
#include "CoapRRLayer.h"
CoapRRLayer::CoapRRLayer(CoapMessageLayer& messageLayer, uint8_t* rxBuffer, uint16_t rxBufferLen) :
m_messageLayer(messageLayer),
m_state(STATE_IDLE),
m_lastResult(NO_ERROR),
m_token(NULL),
m_rxBuffer(rxBuffer),
m_rxBufferLen(rxBufferLen) {
}
CoapRRLayer::Result CoapRRLayer::reliableSend(CoapMsg& msg, char* token, IPAddress addr, uint16_t port) {
if (m_state != STATE_IDLE) {
return ERROR_IMPROPER_STATE;
}
if (CoapMessageLayer::NO_ERROR != m_messageLayer.reliableSend(msg, addr, port)) {
return ERROR_SENDING_MSG;
}
m_token = token;
m_state = STATE_WAITING;
return NO_ERROR;
}
bool CoapRRLayer::rxTokenMatches(CoapMsg& msg) {
if (msg.getTokenLen() != strlen(m_token)) {
return false;
}
if (0 != memcmp(msg.getToken(), m_token, strlen(m_token))) {
return false;
}
return true;
}
CoapRRLayer::Result CoapRRLayer::loop() {
m_lastResult = NO_ERROR;
switch (m_state) {
case STATE_IDLE:
// Pump the receiver.
// We're not serving anything, so unless there's an outstanding
// request (which would mean we would be in STATE_WAITING, not STATE_IDLE),
// we're going to reject or ignore any incoming traffic.
switch(m_messageLayer.loop()) {
case CON_RECEIVED:
{
// Explicitly reject any CON messages so the sender will
// quit bugging us with retransmissions.
CoapMsg msg(m_rxBuffer, m_rxBufferLen, m_messageLayer.getRXByteCount());
m_messageLayer.rejectMsg(msg);
break;
}
default:
// Just ignore anything else.
break;
}
break;
case STATE_WAITING:
// We're waiting for a response to an earlier request.
switch(m_messageLayer.loop()) {
case CoapMessageLayer::NO_ERROR:
// Nothing happened. Nothing to do.
break;
case CoapMessageLayer::ACK_RECEIVED:
{
CoapMsg msg(m_rxBuffer, m_rxBufferLen, m_messageLayer.getRXByteCount());
// If it wasn't an empty ack, it's a response.
// And if the token matches, then it's the response we're waiting for.
if (rxTokenMatches(msg)) {
m_lastResult = RESPONSE_RECEIVED;
m_state = STATE_IDLE;
} else {
// if ACK is not empty and tokens don't match, an error has occurred
if (msg.getTokenLen() != 0) {
m_lastResult = ERROR_RECEIVING_RESPONSE;
m_state = STATE_IDLE;
TEMBOO_TRACE("Error: ");
TEMBOO_TRACELN("Msg token did not match");
}
}
break;
}
case CoapMessageLayer::RESET_RECEIVED:
{
// If it was a reset, the message should be empty
// and there will be no token
m_lastResult = RST_RECEIVED;
m_state = STATE_IDLE;
break;
}
case CoapMessageLayer::CON_RECEIVED:
{
// See if this is our response or just some random message.
// The message layer has already confirmed it's from the right host.
CoapMsg msg(m_rxBuffer, m_rxBufferLen, m_messageLayer.getRXByteCount());
// We only accept responses for the current request (i.e. the tokens must match)
if (rxTokenMatches(msg)) {
m_lastResult = RESPONSE_RECEIVED;
m_state = STATE_IDLE;
} else {
m_messageLayer.rejectMsg(msg);
TEMBOO_TRACE("Error: ");
TEMBOO_TRACELN("Msg token did not match");
}
break;
}
case CoapMessageLayer::NON_RECEIVED:
{
CoapMsg msg(m_rxBuffer, m_rxBufferLen, m_messageLayer.getRXByteCount());
if (rxTokenMatches(msg)) {
m_lastResult = RESPONSE_RECEIVED;
m_state = STATE_IDLE;
} else {
// if the token does not match, then an error occurred
m_lastResult = ERROR_RECEIVING_RESPONSE;
m_state = STATE_IDLE;
TEMBOO_TRACE("Error: ");
TEMBOO_TRACELN("Msg token did not match");
}
break;
}
default:
// Anything else indicates a failure of some sort. Check
// the messageLayer lastResult for specifics.
m_lastResult = ERROR_RECEIVING_RESPONSE;
m_state = STATE_IDLE;
}
break;
}
return m_lastResult;
}
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