| /* | |
| ############################################################################### | |
| # | |
| # 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. | |
| # | |
| ############################################################################### | |
| */ | |
| /** | |
| * CoapRRLayer (Request/Response layer) is a middle layer of the CoAP stack. It is responsible for | |
| * sending requests and receiving responses to those requests. Note that it does not handle | |
| * ACKs or RESETs. Those are handled at the CoapMessageLayer. | |
| * | |
| * This class is intended to implement the CoAP Client Request/Response Layer FSM as described | |
| * by Kovatsch et al. in https://tools.ietf.org/html/draft-kovatsch-lwig-coap-01 | |
| * | |
| * Note that this design only implements the client functionality as our application does not | |
| * serve anything. | |
| */ | |
| class CoapRRLayer { | |
| public: | |
| enum Result { | |
| NO_ERROR = 0, | |
| RESPONSE_RECEIVED, | |
| ACK_RECEIVED, | |
| CON_RECEIVED, | |
| ERROR_IMPROPER_STATE, | |
| ERROR_SENDING_MSG, | |
| ERROR_RECEIVING_RESPONSE, | |
| RST_RECEIVED | |
| }; | |
| enum State { | |
| STATE_IDLE, | |
| STATE_WAITING | |
| }; | |
| CoapRRLayer(CoapMessageLayer& messageLayer, uint8_t* rxBuffer, uint16_t rxBufferLen); | |
| Result reliableSend(CoapMsg& msg, char* token, IPAddress addr, uint16_t port); | |
| Result send(CoapMsg& msg, char* token, IPAddress addr, uint16_t port); | |
| Result loop(); | |
| Result getLastResult() {return m_lastResult;} | |
| void setState(State state) {m_state = state;} | |
| int16_t getRxByteCount() {return m_rxByteCount;} | |
| protected: | |
| CoapMessageLayer& m_messageLayer; | |
| State m_state; | |
| Result m_lastResult; | |
| char* m_token; | |
| uint8_t* m_rxBuffer; | |
| int16_t m_rxByteCount; | |
| uint16_t m_rxBufferLen; | |
| bool rxTokenMatches(CoapMsg& msg); | |
| }; | |