uwmodemcsa.h

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//
// Copyright (c) 2019 Regents of the SIGNET lab, University of Padova.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
// 3. Neither the name of the University of Padova (SIGNET lab) nor the
//    names of its contributors may be used to endorse or promote products
//    derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#ifndef UWMODEMCSA_H
#define UWMODEMCSA_H
 
#include <uwconnector.h>
#include <uwmodem.h>
 
#include <atomic>
#include <condition_variable>
#include <memory>
#include <mutex>
#include <thread>
#include <vector>
 
enum class ModemState { AVAILABLE, BUSY };
 
class UwModemCSA : public UwModem
{
public:
    UwModemCSA();
 
    virtual ~UwModemCSA();
 
    virtual void recv(Packet *p);
 
    virtual int recvSyncClMsg(ClMessage *m);
 
    virtual double getTxDuration(Packet *p);
 
    virtual int command(int argc, const char *const *argv);
 
private:
    virtual void startTx(Packet *p);
 
    virtual void startRx(Packet *p);
 
    virtual void endRx(Packet *p);
 
    virtual void start();
 
    virtual void stop();
 
    virtual void transmittingData();
 
    virtual void receivingData();
 
    virtual std::string findCommand(std::vector<char>::iterator beg_it,
            std::vector<char>::iterator end_it,
            std::vector<char>::iterator &cmd_b,
            std::vector<char>::iterator &cmd_e);
 
    virtual bool parseCommand(std::vector<char>::iterator cmd_b,
            std::vector<char>::iterator cmd_e, std::string &rx_payload);
 
    virtual std::string buildSend(const std::string &payload, int dest);
 
    void startRealRx(const std::string &cmd);
 
    void createRxPacket(Packet *p);
 
    std::unique_ptr<UwConnector> p_connector;
 
    ModemState status; 
    std::mutex status_m;
    std::mutex tx_queue_m;
    std::condition_variable status_cv;
    std::condition_variable tx_queue_cv;
    std::atomic<bool> receiving;
    std::atomic<bool> transmitting;
    std::thread rx_thread;
    std::thread tx_thread;
    std::string rx_payload;
    std::string del_b;
    std::string del_e;
    const static std::chrono::milliseconds MODEM_TIMEOUT;
 
    static const double EPSILON_S;
    static const size_t MAX_TX_STATUS_POLL;
};
 
#endif