/*********************************************************************
 *
 * $Id: yocto_serialport.h 19811 2015-03-23 13:55:45Z mvuilleu $
 *
 * Declares yFindSerialPort(), the high-level API for SerialPort functions
 *
 * - - - - - - - - - License information: - - - - - - - - - 
 *
 *  Copyright (C) 2011 and beyond by Yoctopuce Sarl, Switzerland.
 *
 *  Yoctopuce Sarl (hereafter Licensor) grants to you a perpetual
 *  non-exclusive license to use, modify, copy and integrate this
 *  file into your software for the sole purpose of interfacing
 *  with Yoctopuce products.
 *
 *  You may reproduce and distribute copies of this file in
 *  source or object form, as long as the sole purpose of this
 *  code is to interface with Yoctopuce products. You must retain
 *  this notice in the distributed source file.
 *
 *  You should refer to Yoctopuce General Terms and Conditions
 *  for additional information regarding your rights and
 *  obligations.
 *
 *  THE SOFTWARE AND DOCUMENTATION ARE PROVIDED 'AS IS' WITHOUT
 *  WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING 
 *  WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY, FITNESS
 *  FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO
 *  EVENT SHALL LICENSOR BE LIABLE FOR ANY INCIDENTAL, SPECIAL,
 *  INDIRECT OR CONSEQUENTIAL DAMAGES, LOST PROFITS OR LOST DATA,
 *  COST OF PROCUREMENT OF SUBSTITUTE GOODS, TECHNOLOGY OR 
 *  SERVICES, ANY CLAIMS BY THIRD PARTIES (INCLUDING BUT NOT 
 *  LIMITED TO ANY DEFENSE THEREOF), ANY CLAIMS FOR INDEMNITY OR
 *  CONTRIBUTION, OR OTHER SIMILAR COSTS, WHETHER ASSERTED ON THE
 *  BASIS OF CONTRACT, TORT (INCLUDING NEGLIGENCE), BREACH OF
 *  WARRANTY, OR OTHERWISE.
 *
 *********************************************************************/


#ifndef YOCTO_SERIALPORT_H
#define YOCTO_SERIALPORT_H

#include "yocto_api.h"
#include <cfloat>
#include <cmath>
#include <map>

//--- (YSerialPort return codes)
//--- (end of YSerialPort return codes)
//--- (YSerialPort definitions)
class YSerialPort; // forward declaration

typedef void (*YSerialPortValueCallback)(YSerialPort *func, const string& functionValue);
#ifndef _Y_VOLTAGELEVEL_ENUM
#define _Y_VOLTAGELEVEL_ENUM
typedef enum {
    Y_VOLTAGELEVEL_OFF = 0,
    Y_VOLTAGELEVEL_TTL3V = 1,
    Y_VOLTAGELEVEL_TTL3VR = 2,
    Y_VOLTAGELEVEL_TTL5V = 3,
    Y_VOLTAGELEVEL_TTL5VR = 4,
    Y_VOLTAGELEVEL_RS232 = 5,
    Y_VOLTAGELEVEL_RS485 = 6,
    Y_VOLTAGELEVEL_INVALID = -1,
} Y_VOLTAGELEVEL_enum;
#endif
#define Y_SERIALMODE_INVALID            (YAPI_INVALID_STRING)
#define Y_PROTOCOL_INVALID              (YAPI_INVALID_STRING)
#define Y_RXCOUNT_INVALID               (YAPI_INVALID_UINT)
#define Y_TXCOUNT_INVALID               (YAPI_INVALID_UINT)
#define Y_ERRCOUNT_INVALID              (YAPI_INVALID_UINT)
#define Y_RXMSGCOUNT_INVALID            (YAPI_INVALID_UINT)
#define Y_TXMSGCOUNT_INVALID            (YAPI_INVALID_UINT)
#define Y_LASTMSG_INVALID               (YAPI_INVALID_STRING)
#define Y_CURRENTJOB_INVALID            (YAPI_INVALID_STRING)
#define Y_STARTUPJOB_INVALID            (YAPI_INVALID_STRING)
#define Y_COMMAND_INVALID               (YAPI_INVALID_STRING)
//--- (end of YSerialPort definitions)

//--- (YSerialPort declaration)
/**
 * YSerialPort Class: SerialPort function interface
 *
 * The SerialPort function interface allows you to fully drive a Yoctopuce
 * serial port, to send and receive data, and to configure communication
 * parameters (baud rate, bit count, parity, flow control and protocol).
 * Note that Yoctopuce serial ports are not exposed as virtual COM ports.
 * They are meant to be used in the same way as all Yoctopuce devices.
 */
class YOCTO_CLASS_EXPORT YSerialPort: public YFunction {
#ifdef __BORLANDC__
#pragma option push -w-8022
#endif
//--- (end of YSerialPort declaration)
protected:
    //--- (YSerialPort attributes)
    // Attributes (function value cache)
    string          _serialMode;
    string          _protocol;
    Y_VOLTAGELEVEL_enum _voltageLevel;
    int             _rxCount;
    int             _txCount;
    int             _errCount;
    int             _rxMsgCount;
    int             _txMsgCount;
    string          _lastMsg;
    string          _currentJob;
    string          _startupJob;
    string          _command;
    YSerialPortValueCallback _valueCallbackSerialPort;
    int             _rxptr;

    friend YSerialPort *yFindSerialPort(const string& func);
    friend YSerialPort *yFirstSerialPort(void);

    // Function-specific method for parsing of JSON output and caching result
    virtual int     _parseAttr(yJsonStateMachine& j);

    // Constructor is protected, use yFindSerialPort factory function to instantiate
    YSerialPort(const string& func);
    //--- (end of YSerialPort attributes)

public:
    ~YSerialPort();
    //--- (YSerialPort accessors declaration)

    static const string SERIALMODE_INVALID;
    static const string PROTOCOL_INVALID;
    static const Y_VOLTAGELEVEL_enum VOLTAGELEVEL_OFF = Y_VOLTAGELEVEL_OFF;
    static const Y_VOLTAGELEVEL_enum VOLTAGELEVEL_TTL3V = Y_VOLTAGELEVEL_TTL3V;
    static const Y_VOLTAGELEVEL_enum VOLTAGELEVEL_TTL3VR = Y_VOLTAGELEVEL_TTL3VR;
    static const Y_VOLTAGELEVEL_enum VOLTAGELEVEL_TTL5V = Y_VOLTAGELEVEL_TTL5V;
    static const Y_VOLTAGELEVEL_enum VOLTAGELEVEL_TTL5VR = Y_VOLTAGELEVEL_TTL5VR;
    static const Y_VOLTAGELEVEL_enum VOLTAGELEVEL_RS232 = Y_VOLTAGELEVEL_RS232;
    static const Y_VOLTAGELEVEL_enum VOLTAGELEVEL_RS485 = Y_VOLTAGELEVEL_RS485;
    static const Y_VOLTAGELEVEL_enum VOLTAGELEVEL_INVALID = Y_VOLTAGELEVEL_INVALID;
    static const int RXCOUNT_INVALID = YAPI_INVALID_UINT;
    static const int TXCOUNT_INVALID = YAPI_INVALID_UINT;
    static const int ERRCOUNT_INVALID = YAPI_INVALID_UINT;
    static const int RXMSGCOUNT_INVALID = YAPI_INVALID_UINT;
    static const int TXMSGCOUNT_INVALID = YAPI_INVALID_UINT;
    static const string LASTMSG_INVALID;
    static const string CURRENTJOB_INVALID;
    static const string STARTUPJOB_INVALID;
    static const string COMMAND_INVALID;

    /**
     * Returns the serial port communication parameters, as a string such as
     * "9600,8N1". The string includes the baud rate, the number of data bits,
     * the parity, and the number of stop bits. An optional suffix is included
     * if flow control is active: "CtsRts" for hardware handshake, "XOnXOff"
     * for logical flow control and "Simplex" for acquiring a shared bus using
     * the RTS line (as used by some RS485 adapters for instance).
     *
     * @return a string corresponding to the serial port communication parameters, as a string such as
     *         "9600,8N1"
     *
     * On failure, throws an exception or returns Y_SERIALMODE_INVALID.
     */
    string              get_serialMode(void);

    inline string       serialMode(void)
    { return this->get_serialMode(); }

    /**
     * Changes the serial port communication parameters, with a string such as
     * "9600,8N1". The string includes the baud rate, the number of data bits,
     * the parity, and the number of stop bits. An optional suffix can be added
     * to enable flow control: "CtsRts" for hardware handshake, "XOnXOff"
     * for logical flow control and "Simplex" for acquiring a shared bus using
     * the RTS line (as used by some RS485 adapters for instance).
     *
     * @param newval : a string corresponding to the serial port communication parameters, with a string such as
     *         "9600,8N1"
     *
     * @return YAPI_SUCCESS if the call succeeds.
     *
     * On failure, throws an exception or returns a negative error code.
     */
    int             set_serialMode(const string& newval);
    inline int      setSerialMode(const string& newval)
    { return this->set_serialMode(newval); }

    /**
     * Returns the type of protocol used over the serial line, as a string.
     * Possible values are "Line" for ASCII messages separated by CR and/or LF,
     * "Frame:[timeout]ms" for binary messages separated by a delay time,
     * "Modbus-ASCII" for MODBUS messages in ASCII mode,
     * "Modbus-RTU" for MODBUS messages in RTU mode,
     * "Char" for a continuous ASCII stream or
     * "Byte" for a continuous binary stream.
     *
     * @return a string corresponding to the type of protocol used over the serial line, as a string
     *
     * On failure, throws an exception or returns Y_PROTOCOL_INVALID.
     */
    string              get_protocol(void);

    inline string       protocol(void)
    { return this->get_protocol(); }

    /**
     * Changes the type of protocol used over the serial line.
     * Possible values are "Line" for ASCII messages separated by CR and/or LF,
     * "Frame:[timeout]ms" for binary messages separated by a delay time,
     * "Modbus-ASCII" for MODBUS messages in ASCII mode,
     * "Modbus-RTU" for MODBUS messages in RTU mode,
     * "Char" for a continuous ASCII stream or
     * "Byte" for a continuous binary stream.
     * The suffix "/[wait]ms" can be added to reduce the transmit rate so that there
     * is always at lest the specified number of milliseconds between each bytes sent.
     *
     * @param newval : a string corresponding to the type of protocol used over the serial line
     *
     * @return YAPI_SUCCESS if the call succeeds.
     *
     * On failure, throws an exception or returns a negative error code.
     */
    int             set_protocol(const string& newval);
    inline int      setProtocol(const string& newval)
    { return this->set_protocol(newval); }

    /**
     * Returns the voltage level used on the serial line.
     *
     * @return a value among Y_VOLTAGELEVEL_OFF, Y_VOLTAGELEVEL_TTL3V, Y_VOLTAGELEVEL_TTL3VR,
     * Y_VOLTAGELEVEL_TTL5V, Y_VOLTAGELEVEL_TTL5VR, Y_VOLTAGELEVEL_RS232 and Y_VOLTAGELEVEL_RS485
     * corresponding to the voltage level used on the serial line
     *
     * On failure, throws an exception or returns Y_VOLTAGELEVEL_INVALID.
     */
    Y_VOLTAGELEVEL_enum get_voltageLevel(void);

    inline Y_VOLTAGELEVEL_enum voltageLevel(void)
    { return this->get_voltageLevel(); }

    /**
     * Changes the voltage type used on the serial line. Valid
     * values  will depend on the Yoctopuce device model featuring
     * the serial port feature.  Check your device documentation
     * to find out which values are valid for that specific model.
     * Trying to set an invalid value will have no effect.
     *
     * @param newval : a value among Y_VOLTAGELEVEL_OFF, Y_VOLTAGELEVEL_TTL3V, Y_VOLTAGELEVEL_TTL3VR,
     * Y_VOLTAGELEVEL_TTL5V, Y_VOLTAGELEVEL_TTL5VR, Y_VOLTAGELEVEL_RS232 and Y_VOLTAGELEVEL_RS485
     * corresponding to the voltage type used on the serial line
     *
     * @return YAPI_SUCCESS if the call succeeds.
     *
     * On failure, throws an exception or returns a negative error code.
     */
    int             set_voltageLevel(Y_VOLTAGELEVEL_enum newval);
    inline int      setVoltageLevel(Y_VOLTAGELEVEL_enum newval)
    { return this->set_voltageLevel(newval); }

    /**
     * Returns the total number of bytes received since last reset.
     *
     * @return an integer corresponding to the total number of bytes received since last reset
     *
     * On failure, throws an exception or returns Y_RXCOUNT_INVALID.
     */
    int                 get_rxCount(void);

    inline int          rxCount(void)
    { return this->get_rxCount(); }

    /**
     * Returns the total number of bytes transmitted since last reset.
     *
     * @return an integer corresponding to the total number of bytes transmitted since last reset
     *
     * On failure, throws an exception or returns Y_TXCOUNT_INVALID.
     */
    int                 get_txCount(void);

    inline int          txCount(void)
    { return this->get_txCount(); }

    /**
     * Returns the total number of communication errors detected since last reset.
     *
     * @return an integer corresponding to the total number of communication errors detected since last reset
     *
     * On failure, throws an exception or returns Y_ERRCOUNT_INVALID.
     */
    int                 get_errCount(void);

    inline int          errCount(void)
    { return this->get_errCount(); }

    /**
     * Returns the total number of messages received since last reset.
     *
     * @return an integer corresponding to the total number of messages received since last reset
     *
     * On failure, throws an exception or returns Y_RXMSGCOUNT_INVALID.
     */
    int                 get_rxMsgCount(void);

    inline int          rxMsgCount(void)
    { return this->get_rxMsgCount(); }

    /**
     * Returns the total number of messages send since last reset.
     *
     * @return an integer corresponding to the total number of messages send since last reset
     *
     * On failure, throws an exception or returns Y_TXMSGCOUNT_INVALID.
     */
    int                 get_txMsgCount(void);

    inline int          txMsgCount(void)
    { return this->get_txMsgCount(); }

    /**
     * Returns the latest message fully received (for Line, Frame and Modbus protocols).
     *
     * @return a string corresponding to the latest message fully received (for Line, Frame and Modbus protocols)
     *
     * On failure, throws an exception or returns Y_LASTMSG_INVALID.
     */
    string              get_lastMsg(void);

    inline string       lastMsg(void)
    { return this->get_lastMsg(); }

    /**
     * Returns the name of the job file currently in use.
     *
     * @return a string corresponding to the name of the job file currently in use
     *
     * On failure, throws an exception or returns Y_CURRENTJOB_INVALID.
     */
    string              get_currentJob(void);

    inline string       currentJob(void)
    { return this->get_currentJob(); }

    /**
     * Changes the job to use when the device is powered on.
     * Remember to call the saveToFlash() method of the module if the
     * modification must be kept.
     *
     * @param newval : a string corresponding to the job to use when the device is powered on
     *
     * @return YAPI_SUCCESS if the call succeeds.
     *
     * On failure, throws an exception or returns a negative error code.
     */
    int             set_currentJob(const string& newval);
    inline int      setCurrentJob(const string& newval)
    { return this->set_currentJob(newval); }

    /**
     * Returns the job file to use when the device is powered on.
     *
     * @return a string corresponding to the job file to use when the device is powered on
     *
     * On failure, throws an exception or returns Y_STARTUPJOB_INVALID.
     */
    string              get_startupJob(void);

    inline string       startupJob(void)
    { return this->get_startupJob(); }

    /**
     * Changes the job to use when the device is powered on.
     * Remember to call the saveToFlash() method of the module if the
     * modification must be kept.
     *
     * @param newval : a string corresponding to the job to use when the device is powered on
     *
     * @return YAPI_SUCCESS if the call succeeds.
     *
     * On failure, throws an exception or returns a negative error code.
     */
    int             set_startupJob(const string& newval);
    inline int      setStartupJob(const string& newval)
    { return this->set_startupJob(newval); }

    string              get_command(void);

    inline string       command(void)
    { return this->get_command(); }

    int             set_command(const string& newval);
    inline int      setCommand(const string& newval)
    { return this->set_command(newval); }

    /**
     * Retrieves a serial port for a given identifier.
     * The identifier can be specified using several formats:
     * <ul>
     * <li>FunctionLogicalName</li>
     * <li>ModuleSerialNumber.FunctionIdentifier</li>
     * <li>ModuleSerialNumber.FunctionLogicalName</li>
     * <li>ModuleLogicalName.FunctionIdentifier</li>
     * <li>ModuleLogicalName.FunctionLogicalName</li>
     * </ul>
     *
     * This function does not require that the serial port is online at the time
     * it is invoked. The returned object is nevertheless valid.
     * Use the method YSerialPort.isOnline() to test if the serial port is
     * indeed online at a given time. In case of ambiguity when looking for
     * a serial port by logical name, no error is notified: the first instance
     * found is returned. The search is performed first by hardware name,
     * then by logical name.
     *
     * @param func : a string that uniquely characterizes the serial port
     *
     * @return a YSerialPort object allowing you to drive the serial port.
     */
    static YSerialPort* FindSerialPort(string func);

    /**
     * Registers the callback function that is invoked on every change of advertised value.
     * The callback is invoked only during the execution of ySleep or yHandleEvents.
     * This provides control over the time when the callback is triggered. For good responsiveness, remember to call
     * one of these two functions periodically. To unregister a callback, pass a null pointer as argument.
     *
     * @param callback : the callback function to call, or a null pointer. The callback function should take two
     *         arguments: the function object of which the value has changed, and the character string describing
     *         the new advertised value.
     * @noreturn
     */
    virtual int         registerValueCallback(YSerialPortValueCallback callback);
    using YFunction::registerValueCallback;

    virtual int         _invokeValueCallback(string value);

    virtual int         sendCommand(string text);

    /**
     * Clears the serial port buffer and resets counters to zero.
     *
     * @return YAPI_SUCCESS if the call succeeds.
     *
     * On failure, throws an exception or returns a negative error code.
     */
    virtual int         reset(void);

    /**
     * Manually sets the state of the RTS line. This function has no effect when
     * hardware handshake is enabled, as the RTS line is driven automatically.
     *
     * @param val : 1 to turn RTS on, 0 to turn RTS off
     *
     * @return YAPI_SUCCESS if the call succeeds.
     *
     * On failure, throws an exception or returns a negative error code.
     */
    virtual int         set_RTS(int val);

    /**
     * Reads the level of the CTS line. The CTS line is usually driven by
     * the RTS signal of the connected serial device.
     *
     * @return 1 if the CTS line is high, 0 if the CTS line is low.
     *
     * On failure, throws an exception or returns a negative error code.
     */
    virtual int         get_CTS(void);

    /**
     * Sends a single byte to the serial port.
     *
     * @param code : the byte to send
     *
     * @return YAPI_SUCCESS if the call succeeds.
     *
     * On failure, throws an exception or returns a negative error code.
     */
    virtual int         writeByte(int code);

    /**
     * Sends an ASCII string to the serial port, as is.
     *
     * @param text : the text string to send
     *
     * @return YAPI_SUCCESS if the call succeeds.
     *
     * On failure, throws an exception or returns a negative error code.
     */
    virtual int         writeStr(string text);

    /**
     * Sends a binary buffer to the serial port, as is.
     *
     * @param buff : the binary buffer to send
     *
     * @return YAPI_SUCCESS if the call succeeds.
     *
     * On failure, throws an exception or returns a negative error code.
     */
    virtual int         writeBin(string buff);

    /**
     * Sends a byte sequence (provided as a list of bytes) to the serial port.
     *
     * @param byteList : a list of byte codes
     *
     * @return YAPI_SUCCESS if the call succeeds.
     *
     * On failure, throws an exception or returns a negative error code.
     */
    virtual int         writeArray(vector<int> byteList);

    /**
     * Sends a byte sequence (provided as a hexadecimal string) to the serial port.
     *
     * @param hexString : a string of hexadecimal byte codes
     *
     * @return YAPI_SUCCESS if the call succeeds.
     *
     * On failure, throws an exception or returns a negative error code.
     */
    virtual int         writeHex(string hexString);

    /**
     * Sends an ASCII string to the serial port, followed by a line break (CR LF).
     *
     * @param text : the text string to send
     *
     * @return YAPI_SUCCESS if the call succeeds.
     *
     * On failure, throws an exception or returns a negative error code.
     */
    virtual int         writeLine(string text);

    /**
     * Sends a MODBUS message (provided as a hexadecimal string) to the serial port.
     * The message must start with the slave address. The MODBUS CRC/LRC is
     * automatically added by the function. This function does not wait for a reply.
     *
     * @param hexString : a hexadecimal message string, including device address but no CRC/LRC
     *
     * @return YAPI_SUCCESS if the call succeeds.
     *
     * On failure, throws an exception or returns a negative error code.
     */
    virtual int         writeMODBUS(string hexString);

    /**
     * Reads one byte from the receive buffer, starting at current stream position.
     * If data at current stream position is not available anymore in the receive buffer,
     * or if there is no data available yet, the function returns YAPI_NO_MORE_DATA.
     *
     * @return the next byte
     *
     * On failure, throws an exception or returns a negative error code.
     */
    virtual int         readByte(void);

    /**
     * Reads data from the receive buffer as a string, starting at current stream position.
     * If data at current stream position is not available anymore in the receive buffer, the
     * function performs a short read.
     *
     * @param nChars : the maximum number of characters to read
     *
     * @return a string with receive buffer contents
     *
     * On failure, throws an exception or returns a negative error code.
     */
    virtual string      readStr(int nChars);

    /**
     * Reads data from the receive buffer as a binary buffer, starting at current stream position.
     * If data at current stream position is not available anymore in the receive buffer, the
     * function performs a short read.
     *
     * @param nChars : the maximum number of bytes to read
     *
     * @return a binary object with receive buffer contents
     *
     * On failure, throws an exception or returns a negative error code.
     */
    virtual string      readBin(int nChars);

    /**
     * Reads data from the receive buffer as a list of bytes, starting at current stream position.
     * If data at current stream position is not available anymore in the receive buffer, the
     * function performs a short read.
     *
     * @param nChars : the maximum number of bytes to read
     *
     * @return a sequence of bytes with receive buffer contents
     *
     * On failure, throws an exception or returns a negative error code.
     */
    virtual vector<int> readArray(int nChars);

    /**
     * Reads data from the receive buffer as a hexadecimal string, starting at current stream position.
     * If data at current stream position is not available anymore in the receive buffer, the
     * function performs a short read.
     *
     * @param nBytes : the maximum number of bytes to read
     *
     * @return a string with receive buffer contents, encoded in hexadecimal
     *
     * On failure, throws an exception or returns a negative error code.
     */
    virtual string      readHex(int nBytes);

    /**
     * Reads a single line (or message) from the receive buffer, starting at current stream position.
     * This function is intended to be used when the serial port is configured for a message protocol,
     * such as 'Line' mode or MODBUS protocols.
     *
     * If data at current stream position is not available anymore in the receive buffer,
     * the function returns the oldest available line and moves the stream position just after.
     * If no new full line is received, the function returns an empty line.
     *
     * @return a string with a single line of text
     *
     * On failure, throws an exception or returns a negative error code.
     */
    virtual string      readLine(void);

    /**
     * Searches for incoming messages in the serial port receive buffer matching a given pattern,
     * starting at current position. This function will only compare and return printable characters
     * in the message strings. Binary protocols are handled as hexadecimal strings.
     *
     * The search returns all messages matching the expression provided as argument in the buffer.
     * If no matching message is found, the search waits for one up to the specified maximum timeout
     * (in milliseconds).
     *
     * @param pattern : a limited regular expression describing the expected message format,
     *         or an empty string if all messages should be returned (no filtering).
     *         When using binary protocols, the format applies to the hexadecimal
     *         representation of the message.
     * @param maxWait : the maximum number of milliseconds to wait for a message if none is found
     *         in the receive buffer.
     *
     * @return an array of strings containing the messages found, if any.
     *         Binary messages are converted to hexadecimal representation.
     *
     * On failure, throws an exception or returns an empty array.
     */
    virtual vector<string> readMessages(string pattern,int maxWait);

    /**
     * Changes the current internal stream position to the specified value. This function
     * does not affect the device, it only changes the value stored in the YSerialPort object
     * for the next read operations.
     *
     * @param absPos : the absolute position index for next read operations.
     *
     * @return nothing.
     */
    virtual int         read_seek(int absPos);

    /**
     * Returns the current absolute stream position pointer of the YSerialPort object.
     *
     * @return the absolute position index for next read operations.
     */
    virtual int         read_tell(void);

    /**
     * Returns the number of bytes available to read in the input buffer starting from the
     * current absolute stream position pointer of the YSerialPort object.
     *
     * @return the number of bytes available to read
     */
    virtual int         read_avail(void);

    /**
     * Sends a text line query to the serial port, and reads the reply, if any.
     * This function is intended to be used when the serial port is configured for 'Line' protocol.
     *
     * @param query : the line query to send (without CR/LF)
     * @param maxWait : the maximum number of milliseconds to wait for a reply.
     *
     * @return the next text line received after sending the text query, as a string.
     *         Additional lines can be obtained by calling readLine or readMessages.
     *
     * On failure, throws an exception or returns an empty array.
     */
    virtual string      queryLine(string query,int maxWait);

    /**
     * Sends a message to a specified MODBUS slave connected to the serial port, and reads the
     * reply, if any. The message is the PDU, provided as a vector of bytes.
     *
     * @param slaveNo : the address of the slave MODBUS device to query
     * @param pduBytes : the message to send (PDU), as a vector of bytes. The first byte of the
     *         PDU is the MODBUS function code.
     *
     * @return the received reply, as a vector of bytes.
     *
     * On failure, throws an exception or returns an empty array (or a MODBUS error reply).
     */
    virtual vector<int> queryMODBUS(int slaveNo,vector<int> pduBytes);

    /**
     * Reads one or more contiguous internal bits (or coil status) from a MODBUS serial device.
     * This method uses the MODBUS function code 0x01 (Read Coils).
     *
     * @param slaveNo : the address of the slave MODBUS device to query
     * @param pduAddr : the relative address of the first bit/coil to read (zero-based)
     * @param nBits : the number of bits/coils to read
     *
     * @return a vector of integers, each corresponding to one bit.
     *
     * On failure, throws an exception or returns an empty array.
     */
    virtual vector<int> modbusReadBits(int slaveNo,int pduAddr,int nBits);

    /**
     * Reads one or more contiguous input bits (or discrete inputs) from a MODBUS serial device.
     * This method uses the MODBUS function code 0x02 (Read Discrete Inputs).
     *
     * @param slaveNo : the address of the slave MODBUS device to query
     * @param pduAddr : the relative address of the first bit/input to read (zero-based)
     * @param nBits : the number of bits/inputs to read
     *
     * @return a vector of integers, each corresponding to one bit.
     *
     * On failure, throws an exception or returns an empty array.
     */
    virtual vector<int> modbusReadInputBits(int slaveNo,int pduAddr,int nBits);

    /**
     * Reads one or more contiguous internal registers (holding registers) from a MODBUS serial device.
     * This method uses the MODBUS function code 0x03 (Read Holding Registers).
     *
     * @param slaveNo : the address of the slave MODBUS device to query
     * @param pduAddr : the relative address of the first holding register to read (zero-based)
     * @param nWords : the number of holding registers to read
     *
     * @return a vector of integers, each corresponding to one 16-bit register value.
     *
     * On failure, throws an exception or returns an empty array.
     */
    virtual vector<int> modbusReadRegisters(int slaveNo,int pduAddr,int nWords);

    /**
     * Reads one or more contiguous input registers (read-only registers) from a MODBUS serial device.
     * This method uses the MODBUS function code 0x04 (Read Input Registers).
     *
     * @param slaveNo : the address of the slave MODBUS device to query
     * @param pduAddr : the relative address of the first input register to read (zero-based)
     * @param nWords : the number of input registers to read
     *
     * @return a vector of integers, each corresponding to one 16-bit input value.
     *
     * On failure, throws an exception or returns an empty array.
     */
    virtual vector<int> modbusReadInputRegisters(int slaveNo,int pduAddr,int nWords);

    /**
     * Sets a single internal bit (or coil) on a MODBUS serial device.
     * This method uses the MODBUS function code 0x05 (Write Single Coil).
     *
     * @param slaveNo : the address of the slave MODBUS device to drive
     * @param pduAddr : the relative address of the bit/coil to set (zero-based)
     * @param value : the value to set (0 for OFF state, non-zero for ON state)
     *
     * @return the number of bits/coils affected on the device (1)
     *
     * On failure, throws an exception or returns zero.
     */
    virtual int         modbusWriteBit(int slaveNo,int pduAddr,int value);

    /**
     * Sets several contiguous internal bits (or coils) on a MODBUS serial device.
     * This method uses the MODBUS function code 0x0f (Write Multiple Coils).
     *
     * @param slaveNo : the address of the slave MODBUS device to drive
     * @param pduAddr : the relative address of the first bit/coil to set (zero-based)
     * @param bits : the vector of bits to be set (one integer per bit)
     *
     * @return the number of bits/coils affected on the device
     *
     * On failure, throws an exception or returns zero.
     */
    virtual int         modbusWriteBits(int slaveNo,int pduAddr,vector<int> bits);

    /**
     * Sets a single internal register (or holding register) on a MODBUS serial device.
     * This method uses the MODBUS function code 0x06 (Write Single Register).
     *
     * @param slaveNo : the address of the slave MODBUS device to drive
     * @param pduAddr : the relative address of the register to set (zero-based)
     * @param value : the 16 bit value to set
     *
     * @return the number of registers affected on the device (1)
     *
     * On failure, throws an exception or returns zero.
     */
    virtual int         modbusWriteRegister(int slaveNo,int pduAddr,int value);

    /**
     * Sets several contiguous internal registers (or holding registers) on a MODBUS serial device.
     * This method uses the MODBUS function code 0x10 (Write Multiple Registers).
     *
     * @param slaveNo : the address of the slave MODBUS device to drive
     * @param pduAddr : the relative address of the first internal register to set (zero-based)
     * @param values : the vector of 16 bit values to set
     *
     * @return the number of registers affected on the device
     *
     * On failure, throws an exception or returns zero.
     */
    virtual int         modbusWriteRegisters(int slaveNo,int pduAddr,vector<int> values);

    /**
     * Sets several contiguous internal registers (holding registers) on a MODBUS serial device,
     * then performs a contiguous read of a set of (possibly different) internal registers.
     * This method uses the MODBUS function code 0x17 (Read/Write Multiple Registers).
     *
     * @param slaveNo : the address of the slave MODBUS device to drive
     * @param pduWriteAddr : the relative address of the first internal register to set (zero-based)
     * @param values : the vector of 16 bit values to set
     * @param pduReadAddr : the relative address of the first internal register to read (zero-based)
     * @param nReadWords : the number of 16 bit values to read
     *
     * @return a vector of integers, each corresponding to one 16-bit register value read.
     *
     * On failure, throws an exception or returns an empty array.
     */
    virtual vector<int> modbusWriteAndReadRegisters(int slaveNo,int pduWriteAddr,vector<int> values,int pduReadAddr,int nReadWords);

    /**
     * Saves the job definition string (JSON data) into a job file.
     * The job file can be later enabled using selectJob().
     *
     * @param jobfile : name of the job file to save on the device filesystem
     * @param jsonDef : a string containing a JSON definition of the job
     *
     * @return YAPI_SUCCESS if the call succeeds.
     *
     * On failure, throws an exception or returns a negative error code.
     */
    virtual int         uploadJob(string jobfile,string jsonDef);

    /**
     * Load and start processing the specified job file. The file must have
     * been previously created using the user interface or uploaded on the
     * device filesystem using the uploadJob() function.
     *
     * @param jobfile : name of the job file (on the device filesystem)
     *
     * @return YAPI_SUCCESS if the call succeeds.
     *
     * On failure, throws an exception or returns a negative error code.
     */
    virtual int         selectJob(string jobfile);


    inline static YSerialPort* Find(string func)
    { return YSerialPort::FindSerialPort(func); }

    /**
     * Continues the enumeration of serial ports started using yFirstSerialPort().
     *
     * @return a pointer to a YSerialPort object, corresponding to
     *         a serial port currently online, or a null pointer
     *         if there are no more serial ports to enumerate.
     */
           YSerialPort     *nextSerialPort(void);
    inline YSerialPort     *next(void)
    { return this->nextSerialPort();}

    /**
     * Starts the enumeration of serial ports currently accessible.
     * Use the method YSerialPort.nextSerialPort() to iterate on
     * next serial ports.
     *
     * @return a pointer to a YSerialPort object, corresponding to
     *         the first serial port currently online, or a null pointer
     *         if there are none.
     */
           static YSerialPort* FirstSerialPort(void);
    inline static YSerialPort* First(void)
    { return YSerialPort::FirstSerialPort();}
#ifdef __BORLANDC__
#pragma option pop
#endif
    //--- (end of YSerialPort accessors declaration)
};

//--- (SerialPort functions declaration)

/**
 * Retrieves a serial port for a given identifier.
 * The identifier can be specified using several formats:
 * <ul>
 * <li>FunctionLogicalName</li>
 * <li>ModuleSerialNumber.FunctionIdentifier</li>
 * <li>ModuleSerialNumber.FunctionLogicalName</li>
 * <li>ModuleLogicalName.FunctionIdentifier</li>
 * <li>ModuleLogicalName.FunctionLogicalName</li>
 * </ul>
 *
 * This function does not require that the serial port is online at the time
 * it is invoked. The returned object is nevertheless valid.
 * Use the method YSerialPort.isOnline() to test if the serial port is
 * indeed online at a given time. In case of ambiguity when looking for
 * a serial port by logical name, no error is notified: the first instance
 * found is returned. The search is performed first by hardware name,
 * then by logical name.
 *
 * @param func : a string that uniquely characterizes the serial port
 *
 * @return a YSerialPort object allowing you to drive the serial port.
 */
inline YSerialPort* yFindSerialPort(const string& func)
{ return YSerialPort::FindSerialPort(func);}
/**
 * Starts the enumeration of serial ports currently accessible.
 * Use the method YSerialPort.nextSerialPort() to iterate on
 * next serial ports.
 *
 * @return a pointer to a YSerialPort object, corresponding to
 *         the first serial port currently online, or a null pointer
 *         if there are none.
 */
inline YSerialPort* yFirstSerialPort(void)
{ return YSerialPort::FirstSerialPort();}

//--- (end of SerialPort functions declaration)

#endif
