# -*- coding: utf-8 -*-
# ********************************************************************
#
#  $Id: yocto_serialport_aio.py 66774 2025-05-20 10:15:17Z seb $
#
#  Implements the asyncio YSerialPort 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.
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#  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.
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#  You should refer to Yoctopuce General Terms and Conditions
#  for additional information regarding your rights and
#  obligations.
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#  THE SOFTWARE AND DOCUMENTATION ARE PROVIDED 'AS IS' WITHOUT
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# *********************************************************************
"""
Yoctopuce library: Asyncio implementation of YSerialPort
version: PATCH_WITH_VERSION
requires: yocto_api_aio
"""
from __future__ import annotations

import sys

# On MicroPython, code below will be wiped out at compile time
if sys.implementation.name != "micropython":
    # In CPython, enable edit-time type checking, including Final declaration
    from typing import Any, Union, Final
    from collections.abc import Callable, Awaitable
    from .yocto_api_aio import const, _IS_MICROPYTHON
else:
    # In our micropython VM, common generic types are global built-ins
    # Others such as TypeVar should be avoided when using micropython,
    # as they produce overhead in runtime code
    # Final is translated into const() expressions before compilation
    _IS_MICROPYTHON: Final[bool] = True # noqa

from .yocto_api_aio import (
    YAPIContext, YAPI, YAPI_Exception, YFunction, HwId, hwid2str,
    xarray, xbytearray, XStringIO
)

async def yInternalEventCallback(obj: YSerialPort, value: str) -> None:
    await obj._internalEventHandler(value)

# --- (generated code: YSnoopingRecord class start)
# noinspection PyProtectedMember
class YSnoopingRecord:
    # --- (end of generated code: YSnoopingRecord class start)
    if not _IS_MICROPYTHON:
        # --- (generated code: YSnoopingRecord return codes)
        pass
        # --- (end of generated code: YSnoopingRecord return codes)

    # --- (generated code: YSnoopingRecord attributes declaration)
    _tim: int
    _pos: int
    _dir: int
    _msg: str
    # --- (end of generated code: YSnoopingRecord attributes declaration)

    def __init__(self, json_data: XStringIO):
        # --- (generated code: YSnoopingRecord constructor)
        self._tim = 0
        self._pos = 0
        self._dir = 0
        self._msg = ''
        # --- (end of generated code: YSnoopingRecord constructor)
        json_val: Any = json.load(json_data)
        if 't' in json_val:
            self._tim = json_val["t"]
        if 'p' in json_val:
            self._pos = json_val["p"]
        if 'm' in json_val:
            m: str = json_val["m"]
            if m[0] == '<':
                self._dir = 1
            else:
                self._dir = 0
            self._msg = m[1:]

    # --- (generated code: YSnoopingRecord implementation)
    def get_time(self) -> int:
        """
        Returns the elapsed time, in ms, since the beginning of the preceding message.

        @return the elapsed time, in ms, since the beginning of the preceding message.
        """
        return self._tim

    def get_pos(self) -> int:
        """
        Returns the absolute position of the message end.

        @return the absolute position of the message end.
        """
        return self._pos

    def get_direction(self) -> int:
        """
        Returns the message direction (RX=0, TX=1).

        @return the message direction (RX=0, TX=1).
        """
        return self._dir

    def get_message(self) -> str:
        """
        Returns the message content.

        @return the message content.
        """
        return self._msg

    # --- (end of generated code: YSnoopingRecord implementation)


# --- (generated code: YSerialPort class start)
if not _IS_MICROPYTHON:
    # For CPython, use strongly typed callback types
    try:
        YSerialPortValueCallback = Union[Callable[['YSerialPort', str], Any], None]
        YSnoopingCallback = Union[Callable[['YSerialPort', YSnoopingRecord], Any], None]
    except TypeError:
        YSerialPortValueCallback = Union[Callable, Awaitable]
        YSnoopingCallback = Union[Callable, Awaitable]

# noinspection PyProtectedMember
class YSerialPort(YFunction):
    """
    The YSerialPort class allows you to fully drive a Yoctopuce serial port.
    It can be used 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.

    """
    # --- (end of generated code: YSerialPort class start)
    if not _IS_MICROPYTHON:
        # --- (generated code: YSerialPort return codes)
        RXCOUNT_INVALID: Final[int] = YAPI.INVALID_UINT
        TXCOUNT_INVALID: Final[int] = YAPI.INVALID_UINT
        ERRCOUNT_INVALID: Final[int] = YAPI.INVALID_UINT
        RXMSGCOUNT_INVALID: Final[int] = YAPI.INVALID_UINT
        TXMSGCOUNT_INVALID: Final[int] = YAPI.INVALID_UINT
        LASTMSG_INVALID: Final[str] = YAPI.INVALID_STRING
        CURRENTJOB_INVALID: Final[str] = YAPI.INVALID_STRING
        STARTUPJOB_INVALID: Final[str] = YAPI.INVALID_STRING
        JOBMAXTASK_INVALID: Final[int] = YAPI.INVALID_UINT
        JOBMAXSIZE_INVALID: Final[int] = YAPI.INVALID_UINT
        COMMAND_INVALID: Final[str] = YAPI.INVALID_STRING
        PROTOCOL_INVALID: Final[str] = YAPI.INVALID_STRING
        SERIALMODE_INVALID: Final[str] = YAPI.INVALID_STRING
        VOLTAGELEVEL_OFF: Final[int] = 0
        VOLTAGELEVEL_TTL3V: Final[int] = 1
        VOLTAGELEVEL_TTL3VR: Final[int] = 2
        VOLTAGELEVEL_TTL5V: Final[int] = 3
        VOLTAGELEVEL_TTL5VR: Final[int] = 4
        VOLTAGELEVEL_RS232: Final[int] = 5
        VOLTAGELEVEL_RS485: Final[int] = 6
        VOLTAGELEVEL_TTL1V8: Final[int] = 7
        VOLTAGELEVEL_SDI12: Final[int] = 8
        VOLTAGELEVEL_INVALID: Final[int] = -1
        # --- (end of generated code: YSerialPort return codes)

    # --- (generated code: YSerialPort attributes declaration)
    _rxCount: int
    _txCount: int
    _errCount: int
    _rxMsgCount: int
    _txMsgCount: int
    _lastMsg: str
    _currentJob: str
    _startupJob: str
    _jobMaxTask: int
    _jobMaxSize: int
    _command: str
    _protocol: str
    _voltageLevel: int
    _serialMode: str
    _valueCallback: YSerialPortValueCallback
    _rxptr: int
    _rxbuff: xarray
    _rxbuffptr: int
    _eventPos: int
    _eventCallback: YSnoopingCallback
    # --- (end of generated code: YSerialPort attributes declaration)

    def __init__(self, yctx: YAPIContext, func: str):
        super().__init__(yctx, func)
        self._className = 'SerialPort'
        # --- (generated code: YSerialPort constructor)
        self._rxCount = YSerialPort.RXCOUNT_INVALID
        self._txCount = YSerialPort.TXCOUNT_INVALID
        self._errCount = YSerialPort.ERRCOUNT_INVALID
        self._rxMsgCount = YSerialPort.RXMSGCOUNT_INVALID
        self._txMsgCount = YSerialPort.TXMSGCOUNT_INVALID
        self._lastMsg = YSerialPort.LASTMSG_INVALID
        self._currentJob = YSerialPort.CURRENTJOB_INVALID
        self._startupJob = YSerialPort.STARTUPJOB_INVALID
        self._jobMaxTask = YSerialPort.JOBMAXTASK_INVALID
        self._jobMaxSize = YSerialPort.JOBMAXSIZE_INVALID
        self._command = YSerialPort.COMMAND_INVALID
        self._protocol = YSerialPort.PROTOCOL_INVALID
        self._voltageLevel = YSerialPort.VOLTAGELEVEL_INVALID
        self._serialMode = YSerialPort.SERIALMODE_INVALID
        self._rxptr = 0
        self._rxbuff = xbytearray(0)
        self._rxbuffptr = 0
        self._eventPos = 0
        # --- (end of generated code: YSerialPort constructor)

    # --- (generated code: YSerialPort implementation)

    @staticmethod
    def FirstSerialPort() -> Union[YSerialPort, None]:
        """
        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 None pointer
                if there are none.
        """
        next_hwid: Union[HwId, None] = YAPI._yHash.getFirstHardwareId('SerialPort')
        if not next_hwid:
            return None
        return YSerialPort.FindSerialPort(hwid2str(next_hwid))

    @staticmethod
    def FirstSerialPortInContext(yctx: YAPIContext) -> Union[YSerialPort, None]:
        """
        Starts the enumeration of serial ports currently accessible.
        Use the method YSerialPort.nextSerialPort() to iterate on
        next serial ports.

        @param yctx : a YAPI context.

        @return a pointer to a YSerialPort object, corresponding to
                the first serial port currently online, or a None pointer
                if there are none.
        """
        next_hwid: Union[HwId, None] = yctx._yHash.getFirstHardwareId('SerialPort')
        if not next_hwid:
            return None
        return YSerialPort.FindSerialPortInContext(yctx, hwid2str(next_hwid))

    def nextSerialPort(self):
        """
        Continues the enumeration of serial ports started using yFirstSerialPort().
        Caution: You can't make any assumption about the returned serial ports order.
        If you want to find a specific a serial port, use SerialPort.findSerialPort()
        and a hardwareID or a logical name.

        @return a pointer to a YSerialPort object, corresponding to
                a serial port currently online, or a None pointer
                if there are no more serial ports to enumerate.
        """
        next_hwid: Union[HwId, None] = None
        try:
            hwid: HwId = self._yapi._yHash.resolveHwID(self._className, self._func)
            next_hwid = self._yapi._yHash.getNextHardwareId(self._className, hwid)
        except YAPI_Exception:
            pass
        if not next_hwid:
            return None
        return YSerialPort.FindSerialPortInContext(self._yapi, hwid2str(next_hwid))

    def _parseAttr(self, json_val: dict) -> None:
        if 'rxCount' in json_val:
            self._rxCount = json_val["rxCount"]
        if 'txCount' in json_val:
            self._txCount = json_val["txCount"]
        if 'errCount' in json_val:
            self._errCount = json_val["errCount"]
        if 'rxMsgCount' in json_val:
            self._rxMsgCount = json_val["rxMsgCount"]
        if 'txMsgCount' in json_val:
            self._txMsgCount = json_val["txMsgCount"]
        if 'lastMsg' in json_val:
            self._lastMsg = json_val["lastMsg"]
        if 'currentJob' in json_val:
            self._currentJob = json_val["currentJob"]
        if 'startupJob' in json_val:
            self._startupJob = json_val["startupJob"]
        if 'jobMaxTask' in json_val:
            self._jobMaxTask = json_val["jobMaxTask"]
        if 'jobMaxSize' in json_val:
            self._jobMaxSize = json_val["jobMaxSize"]
        if 'command' in json_val:
            self._command = json_val["command"]
        if 'protocol' in json_val:
            self._protocol = json_val["protocol"]
        if 'voltageLevel' in json_val:
            self._voltageLevel = json_val["voltageLevel"]
        if 'serialMode' in json_val:
            self._serialMode = json_val["serialMode"]
        super()._parseAttr(json_val)

    async def get_rxCount(self) -> int:
        """
        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 YSerialPort.RXCOUNT_INVALID.
        """
        res: int
        if self._cacheExpiration <= YAPI.GetTickCount():
            if await self.load(self._yapi.GetCacheValidity()) != YAPI.SUCCESS:
                return YSerialPort.RXCOUNT_INVALID
        res = self._rxCount
        return res

    async def get_txCount(self) -> int:
        """
        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 YSerialPort.TXCOUNT_INVALID.
        """
        res: int
        if self._cacheExpiration <= YAPI.GetTickCount():
            if await self.load(self._yapi.GetCacheValidity()) != YAPI.SUCCESS:
                return YSerialPort.TXCOUNT_INVALID
        res = self._txCount
        return res

    async def get_errCount(self) -> int:
        """
        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 YSerialPort.ERRCOUNT_INVALID.
        """
        res: int
        if self._cacheExpiration <= YAPI.GetTickCount():
            if await self.load(self._yapi.GetCacheValidity()) != YAPI.SUCCESS:
                return YSerialPort.ERRCOUNT_INVALID
        res = self._errCount
        return res

    async def get_rxMsgCount(self) -> int:
        """
        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 YSerialPort.RXMSGCOUNT_INVALID.
        """
        res: int
        if self._cacheExpiration <= YAPI.GetTickCount():
            if await self.load(self._yapi.GetCacheValidity()) != YAPI.SUCCESS:
                return YSerialPort.RXMSGCOUNT_INVALID
        res = self._rxMsgCount
        return res

    async def get_txMsgCount(self) -> int:
        """
        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 YSerialPort.TXMSGCOUNT_INVALID.
        """
        res: int
        if self._cacheExpiration <= YAPI.GetTickCount():
            if await self.load(self._yapi.GetCacheValidity()) != YAPI.SUCCESS:
                return YSerialPort.TXMSGCOUNT_INVALID
        res = self._txMsgCount
        return res

    async def get_lastMsg(self) -> str:
        """
        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 YSerialPort.LASTMSG_INVALID.
        """
        res: str
        if self._cacheExpiration <= YAPI.GetTickCount():
            if await self.load(self._yapi.GetCacheValidity()) != YAPI.SUCCESS:
                return YSerialPort.LASTMSG_INVALID
        res = self._lastMsg
        return res

    async def get_currentJob(self) -> str:
        """
        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 YSerialPort.CURRENTJOB_INVALID.
        """
        res: str
        if self._cacheExpiration <= YAPI.GetTickCount():
            if await self.load(self._yapi.GetCacheValidity()) != YAPI.SUCCESS:
                return YSerialPort.CURRENTJOB_INVALID
        res = self._currentJob
        return res

    async def set_currentJob(self, newval: str) -> int:
        """
        Selects a job file to run immediately. If an empty string is
        given as argument, stops running current job file.

        @param newval : a string

        @return YAPI.SUCCESS if the call succeeds.

        On failure, throws an exception or returns a negative error code.
        """
        rest_val = newval
        return await self._setAttr("currentJob", rest_val)

    async def get_startupJob(self) -> str:
        """
        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 YSerialPort.STARTUPJOB_INVALID.
        """
        res: str
        if self._cacheExpiration <= YAPI.GetTickCount():
            if await self.load(self._yapi.GetCacheValidity()) != YAPI.SUCCESS:
                return YSerialPort.STARTUPJOB_INVALID
        res = self._startupJob
        return res

    async def set_startupJob(self, newval: str) -> int:
        """
        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.
        """
        rest_val = newval
        return await self._setAttr("startupJob", rest_val)

    async def get_jobMaxTask(self) -> int:
        """
        Returns the maximum number of tasks in a job that the device can handle.

        @return an integer corresponding to the maximum number of tasks in a job that the device can handle

        On failure, throws an exception or returns YSerialPort.JOBMAXTASK_INVALID.
        """
        res: int
        if self._cacheExpiration == 0:
            if await self.load(self._yapi.GetCacheValidity()) != YAPI.SUCCESS:
                return YSerialPort.JOBMAXTASK_INVALID
        res = self._jobMaxTask
        return res

    async def get_jobMaxSize(self) -> int:
        """
        Returns maximum size allowed for job files.

        @return an integer corresponding to maximum size allowed for job files

        On failure, throws an exception or returns YSerialPort.JOBMAXSIZE_INVALID.
        """
        res: int
        if self._cacheExpiration == 0:
            if await self.load(self._yapi.GetCacheValidity()) != YAPI.SUCCESS:
                return YSerialPort.JOBMAXSIZE_INVALID
        res = self._jobMaxSize
        return res

    async def get_command(self) -> str:
        res: str
        if self._cacheExpiration <= YAPI.GetTickCount():
            if await self.load(self._yapi.GetCacheValidity()) != YAPI.SUCCESS:
                return YSerialPort.COMMAND_INVALID
        res = self._command
        return res

    async def set_command(self, newval: str) -> int:
        rest_val = newval
        return await self._setAttr("command", rest_val)

    async def get_protocol(self) -> str:
        """
        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,
        "StxEtx" for ASCII messages delimited by STX/ETX codes,
        "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,
        "Wiegand-ASCII" for Wiegand messages in ASCII mode,
        "Wiegand-26","Wiegand-34", etc for Wiegand messages in byte 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 YSerialPort.PROTOCOL_INVALID.
        """
        res: str
        if self._cacheExpiration <= YAPI.GetTickCount():
            if await self.load(self._yapi.GetCacheValidity()) != YAPI.SUCCESS:
                return YSerialPort.PROTOCOL_INVALID
        res = self._protocol
        return res

    async def set_protocol(self, newval: str) -> int:
        """
        Changes the type of protocol used over the serial line.
        Possible values are "Line" for ASCII messages separated by CR and/or LF,
        "StxEtx" for ASCII messages delimited by STX/ETX codes,
        "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,
        "Wiegand-ASCII" for Wiegand messages in ASCII mode,
        "Wiegand-26","Wiegand-34", etc for Wiegand messages in byte 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.
        Remember to call the saveToFlash() method of the module if the
        modification must be kept.

        @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.
        """
        rest_val = newval
        return await self._setAttr("protocol", rest_val)

    async def get_voltageLevel(self) -> int:
        """
        Returns the voltage level used on the serial line.

        @return a value among YSerialPort.VOLTAGELEVEL_OFF, YSerialPort.VOLTAGELEVEL_TTL3V,
        YSerialPort.VOLTAGELEVEL_TTL3VR, YSerialPort.VOLTAGELEVEL_TTL5V, YSerialPort.VOLTAGELEVEL_TTL5VR,
        YSerialPort.VOLTAGELEVEL_RS232, YSerialPort.VOLTAGELEVEL_RS485, YSerialPort.VOLTAGELEVEL_TTL1V8 and
        YSerialPort.VOLTAGELEVEL_SDI12 corresponding to the voltage level used on the serial line

        On failure, throws an exception or returns YSerialPort.VOLTAGELEVEL_INVALID.
        """
        res: int
        if self._cacheExpiration <= YAPI.GetTickCount():
            if await self.load(self._yapi.GetCacheValidity()) != YAPI.SUCCESS:
                return YSerialPort.VOLTAGELEVEL_INVALID
        res = self._voltageLevel
        return res

    async def set_voltageLevel(self, newval: int) -> int:
        """
        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.
        Remember to call the saveToFlash() method of the module if the
        modification must be kept.

        @param newval : a value among YSerialPort.VOLTAGELEVEL_OFF, YSerialPort.VOLTAGELEVEL_TTL3V,
        YSerialPort.VOLTAGELEVEL_TTL3VR, YSerialPort.VOLTAGELEVEL_TTL5V, YSerialPort.VOLTAGELEVEL_TTL5VR,
        YSerialPort.VOLTAGELEVEL_RS232, YSerialPort.VOLTAGELEVEL_RS485, YSerialPort.VOLTAGELEVEL_TTL1V8 and
        YSerialPort.VOLTAGELEVEL_SDI12 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.
        """
        rest_val = str(newval)
        return await self._setAttr("voltageLevel", rest_val)

    async def get_serialMode(self) -> str:
        """
        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 YSerialPort.SERIALMODE_INVALID.
        """
        res: str
        if self._cacheExpiration <= YAPI.GetTickCount():
            if await self.load(self._yapi.GetCacheValidity()) != YAPI.SUCCESS:
                return YSerialPort.SERIALMODE_INVALID
        res = self._serialMode
        return res

    async def set_serialMode(self, newval: str) -> int:
        """
        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).
        Remember to call the saveToFlash() method of the module if the
        modification must be kept.

        @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.
        """
        rest_val = newval
        return await self._setAttr("serialMode", rest_val)

    @staticmethod
    def FindSerialPort(func: str) -> YSerialPort:
        """
        Retrieves a serial port for a given identifier.
        The identifier can be specified using several formats:

        - FunctionLogicalName
        - ModuleSerialNumber.FunctionIdentifier
        - ModuleSerialNumber.FunctionLogicalName
        - ModuleLogicalName.FunctionIdentifier
        - ModuleLogicalName.FunctionLogicalName


        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.

        If a call to this object's is_online() method returns FALSE although
        you are certain that the matching device is plugged, make sure that you did
        call registerHub() at application initialization time.

        @param func : a string that uniquely characterizes the serial port, for instance
                RS232MK1.serialPort.

        @return a YSerialPort object allowing you to drive the serial port.
        """
        obj: Union[YSerialPort, None]
        obj = YFunction._FindFromCache("SerialPort", func)
        if obj is None:
            obj = YSerialPort(YAPI, func)
            YFunction._AddToCache("SerialPort", func, obj)
        return obj

    @staticmethod
    def FindSerialPortInContext(yctx: YAPIContext, func: str) -> YSerialPort:
        """
        Retrieves a serial port for a given identifier in a YAPI context.
        The identifier can be specified using several formats:

        - FunctionLogicalName
        - ModuleSerialNumber.FunctionIdentifier
        - ModuleSerialNumber.FunctionLogicalName
        - ModuleLogicalName.FunctionIdentifier
        - ModuleLogicalName.FunctionLogicalName


        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 yctx : a YAPI context
        @param func : a string that uniquely characterizes the serial port, for instance
                RS232MK1.serialPort.

        @return a YSerialPort object allowing you to drive the serial port.
        """
        obj: Union[YSerialPort, None]
        obj = YFunction._FindFromCacheInContext(yctx, "SerialPort", func)
        if obj is None:
            obj = YSerialPort(yctx, func)
            YFunction._AddToCache("SerialPort", func, obj)
        return obj

    if not _IS_MICROPYTHON:
        async def registerValueCallback(self, callback: YSerialPortValueCallback) -> int:
            """
            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 None pointer as argument.

            @param callback : the callback function to call, or a None 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
            """
            return await super().registerValueCallback(callback)

    async def sendCommand(self, text: str) -> int:
        return await self.set_command(text)

    async def readLine(self) -> str:
        """
        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 frame 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.
        """
        url: str
        msgbin: xarray
        msgarr: list[xarray] = []
        msglen: int
        res: str

        url = "rxmsg.json?pos=%d&len=1&maxw=1" % self._rxptr
        msgbin = await self._download(url)
        msgarr = self._json_get_array(msgbin)
        msglen = len(msgarr)
        if msglen == 0:
            return ""
        # last element of array is the new position
        msglen = msglen - 1
        self._rxptr = self._decode_json_int(msgarr[msglen])
        if msglen == 0:
            return ""
        res = self._json_get_string(msgarr[0])
        return res

    async def readMessages(self, pattern: str, maxWait: int) -> list[str]:
        """
        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.
        """
        url: str
        msgbin: xarray
        msgarr: list[xarray] = []
        msglen: int
        res: list[str] = []
        idx: int

        url = "rxmsg.json?pos=%d&maxw=%d&pat=%s" % (self._rxptr, maxWait, pattern)
        msgbin = await self._download(url)
        msgarr = self._json_get_array(msgbin)
        msglen = len(msgarr)
        if msglen == 0:
            return res
        # last element of array is the new position
        msglen = msglen - 1
        self._rxptr = self._decode_json_int(msgarr[msglen])
        idx = 0

        while idx < msglen:
            res.append(self._json_get_string(msgarr[idx]))
            idx = idx + 1

        return res

    async def read_seek(self, absPos: int) -> int:
        """
        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 API object
        for the next read operations.

        @param absPos : the absolute position index for next read operations.

        @return nothing.
        """
        self._rxptr = absPos
        return YAPI.SUCCESS

    async def read_tell(self) -> int:
        """
        Returns the current absolute stream position pointer of the API object.

        @return the absolute position index for next read operations.
        """
        return self._rxptr

    async def read_avail(self) -> int:
        """
        Returns the number of bytes available to read in the input buffer starting from the
        current absolute stream position pointer of the API object.

        @return the number of bytes available to read
        """
        availPosStr: str
        atPos: int
        res: int
        databin: xarray

        databin = await self._download("rxcnt.bin?pos=%d" % self._rxptr)
        availPosStr = databin.decode('latin-1')
        atPos = availPosStr.find("@")
        res = YAPI._atoi(availPosStr[0: 0 + atPos])
        return res

    async def end_tell(self) -> int:
        availPosStr: str
        atPos: int
        res: int
        databin: xarray

        databin = await self._download("rxcnt.bin?pos=%d" % self._rxptr)
        availPosStr = databin.decode('latin-1')
        atPos = availPosStr.find("@")
        res = YAPI._atoi(availPosStr[atPos+1: atPos+1 + len(availPosStr)-atPos-1])
        return res

    async def queryLine(self, query: str, maxWait: int) -> str:
        """
        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 string.
        """
        prevpos: int
        url: str
        msgbin: xarray
        msgarr: list[xarray] = []
        msglen: int
        res: str
        if len(query) <= 80:
            # fast query
            url = "rxmsg.json?len=1&maxw=%d&cmd=!%s" % (maxWait, self._escapeAttr(query))
        else:
            # long query
            prevpos = await self.end_tell()
            await self._upload("txdata", xbytearray(query + "\r\n", 'latin-1'))
            url = "rxmsg.json?len=1&maxw=%d&pos=%d" % (maxWait, prevpos)

        msgbin = await self._download(url)
        msgarr = self._json_get_array(msgbin)
        msglen = len(msgarr)
        if msglen == 0:
            return ""
        # last element of array is the new position
        msglen = msglen - 1
        self._rxptr = self._decode_json_int(msgarr[msglen])
        if msglen == 0:
            return ""
        res = self._json_get_string(msgarr[0])
        return res

    async def queryHex(self, hexString: str, maxWait: int) -> str:
        """
        Sends a binary message to the serial port, and reads the reply, if any.
        This function is intended to be used when the serial port is configured for
        Frame-based protocol.

        @param hexString : the message to send, coded in hexadecimal
        @param maxWait : the maximum number of milliseconds to wait for a reply.

        @return the next frame received after sending the message, as a hex string.
                Additional frames can be obtained by calling readHex or readMessages.

        On failure, throws an exception or returns an empty string.
        """
        prevpos: int
        url: str
        msgbin: xarray
        msgarr: list[xarray] = []
        msglen: int
        res: str
        if len(hexString) <= 80:
            # fast query
            url = "rxmsg.json?len=1&maxw=%d&cmd=$%s" % (maxWait, hexString)
        else:
            # long query
            prevpos = await self.end_tell()
            await self._upload("txdata", YAPI._hexStrToBin(hexString))
            url = "rxmsg.json?len=1&maxw=%d&pos=%d" % (maxWait, prevpos)

        msgbin = await self._download(url)
        msgarr = self._json_get_array(msgbin)
        msglen = len(msgarr)
        if msglen == 0:
            return ""
        # last element of array is the new position
        msglen = msglen - 1
        self._rxptr = self._decode_json_int(msgarr[msglen])
        if msglen == 0:
            return ""
        res = self._json_get_string(msgarr[0])
        return res

    async def uploadJob(self, jobfile: str, jsonDef: str) -> int:
        """
        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.
        """
        await self._upload(jobfile, xbytearray(jsonDef, 'latin-1'))
        return YAPI.SUCCESS

    async def selectJob(self, jobfile: str) -> int:
        """
        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.
        """
        return await self.set_currentJob(jobfile)

    async def reset(self) -> int:
        """
        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.
        """
        self._eventPos = 0
        self._rxptr = 0
        self._rxbuffptr = 0
        self._rxbuff = xbytearray(0)

        return await self.sendCommand("Z")

    async def writeByte(self, code: int) -> int:
        """
        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.
        """
        return await self.sendCommand("$%02X" % code)

    async def writeStr(self, text: str) -> int:
        """
        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.
        """
        buff: xarray
        bufflen: int
        idx: int
        ch: int
        buff = xbytearray(text, 'latin-1')
        bufflen = len(buff)
        if bufflen < 100:
            # if string is pure text, we can send it as a simple command (faster)
            ch = 0x20
            idx = 0
            while (idx < bufflen) and(ch != 0):
                ch = buff[idx]
                if (ch >= 0x20) and(ch < 0x7f):
                    idx = idx + 1
                else:
                    ch = 0
            if idx >= bufflen:
                return await self.sendCommand("+%s" % text)
        # send string using file upload
        return await self._upload("txdata", buff)

    async def writeBin(self, buff: xarray) -> int:
        """
        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.
        """
        return await self._upload("txdata", buff)

    async def writeArray(self, byteList: list[int]) -> int:
        """
        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.
        """
        buff: xarray
        bufflen: int
        idx: int
        hexb: int
        res: int
        bufflen = len(byteList)
        buff = xbytearray(bufflen)
        idx = 0
        while idx < bufflen:
            hexb = byteList[idx]
            buff[idx] = hexb
            idx = idx + 1

        res = await self._upload("txdata", buff)
        return res

    async def writeHex(self, hexString: str) -> int:
        """
        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.
        """
        buff: xarray
        bufflen: int
        idx: int
        hexb: int
        res: int
        bufflen = len(hexString)
        if bufflen < 100:
            return await self.sendCommand("$%s" % hexString)
        bufflen = (bufflen >> 1)
        buff = xbytearray(bufflen)
        idx = 0
        while idx < bufflen:
            hexb = int(hexString[2 * idx: 2 * idx + 2], 16)
            buff[idx] = hexb
            idx = idx + 1

        res = await self._upload("txdata", buff)
        return res

    async def writeLine(self, text: str) -> int:
        """
        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.
        """
        buff: xarray
        bufflen: int
        idx: int
        ch: int
        buff = xbytearray("%s\r\n" % text, 'latin-1')
        bufflen = len(buff)-2
        if bufflen < 100:
            # if string is pure text, we can send it as a simple command (faster)
            ch = 0x20
            idx = 0
            while (idx < bufflen) and(ch != 0):
                ch = buff[idx]
                if (ch >= 0x20) and(ch < 0x7f):
                    idx = idx + 1
                else:
                    ch = 0
            if idx >= bufflen:
                return await self.sendCommand("!%s" % text)
        # send string using file upload
        return await self._upload("txdata", buff)

    async def readByte(self) -> int:
        """
        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.
        """
        currpos: int
        reqlen: int
        buff: xarray
        bufflen: int
        mult: int
        endpos: int
        res: int
        # first check if we have the requested character in the look-ahead buffer
        bufflen = len(self._rxbuff)
        if (self._rxptr >= self._rxbuffptr) and(self._rxptr < self._rxbuffptr+bufflen):
            res = self._rxbuff[self._rxptr-self._rxbuffptr]
            self._rxptr = self._rxptr + 1
            return res
        # try to preload more than one byte to speed-up byte-per-byte access
        currpos = self._rxptr
        reqlen = 1024
        buff = await self.readBin(reqlen)
        bufflen = len(buff)
        if self._rxptr == currpos+bufflen:
            res = buff[0]
            self._rxptr = currpos+1
            self._rxbuffptr = currpos
            self._rxbuff = buff
            return res
        # mixed bidirectional data, retry with a smaller block
        self._rxptr = currpos
        reqlen = 16
        buff = await self.readBin(reqlen)
        bufflen = len(buff)
        if self._rxptr == currpos+bufflen:
            res = buff[0]
            self._rxptr = currpos+1
            self._rxbuffptr = currpos
            self._rxbuff = buff
            return res
        # still mixed, need to process character by character
        self._rxptr = currpos

        buff = await self._download("rxdata.bin?pos=%d&len=1" % self._rxptr)
        bufflen = len(buff) - 1
        endpos = 0
        mult = 1
        while (bufflen > 0) and(buff[bufflen] != 64):
            endpos = endpos + mult * (buff[bufflen] - 48)
            mult = mult * 10
            bufflen = bufflen - 1
        self._rxptr = endpos
        if bufflen == 0:
            return YAPI.NO_MORE_DATA
        res = buff[0]
        return res

    async def readStr(self, nChars: int) -> str:
        """
        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.
        """
        buff: xarray
        bufflen: int
        mult: int
        endpos: int
        res: str
        if nChars > 65535:
            nChars = 65535

        buff = await self._download("rxdata.bin?pos=%d&len=%d" % (self._rxptr, nChars))
        bufflen = len(buff) - 1
        endpos = 0
        mult = 1
        while (bufflen > 0) and(buff[bufflen] != 64):
            endpos = endpos + mult * (buff[bufflen] - 48)
            mult = mult * 10
            bufflen = bufflen - 1
        self._rxptr = endpos
        res = (buff.decode('latin-1'))[0: 0 + bufflen]
        return res

    async def readBin(self, nChars: int) -> xarray:
        """
        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.
        """
        buff: xarray
        bufflen: int
        mult: int
        endpos: int
        idx: int
        res: xarray
        if nChars > 65535:
            nChars = 65535

        buff = await self._download("rxdata.bin?pos=%d&len=%d" % (self._rxptr, nChars))
        bufflen = len(buff) - 1
        endpos = 0
        mult = 1
        while (bufflen > 0) and(buff[bufflen] != 64):
            endpos = endpos + mult * (buff[bufflen] - 48)
            mult = mult * 10
            bufflen = bufflen - 1
        self._rxptr = endpos
        res = xbytearray(bufflen)
        idx = 0
        while idx < bufflen:
            res[idx] = buff[idx]
            idx = idx + 1
        return res

    async def readArray(self, nChars: int) -> list[int]:
        """
        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 an empty array.
        """
        buff: xarray
        bufflen: int
        mult: int
        endpos: int
        idx: int
        b: int
        res: list[int] = []
        if nChars > 65535:
            nChars = 65535

        buff = await self._download("rxdata.bin?pos=%d&len=%d" % (self._rxptr, nChars))
        bufflen = len(buff) - 1
        endpos = 0
        mult = 1
        while (bufflen > 0) and(buff[bufflen] != 64):
            endpos = endpos + mult * (buff[bufflen] - 48)
            mult = mult * 10
            bufflen = bufflen - 1
        self._rxptr = endpos
        del res[:]
        idx = 0
        while idx < bufflen:
            b = buff[idx]
            res.append(b)
            idx = idx + 1

        return res

    async def readHex(self, nBytes: int) -> str:
        """
        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.
        """
        buff: xarray
        bufflen: int
        mult: int
        endpos: int
        ofs: int
        res: str
        if nBytes > 65535:
            nBytes = 65535

        buff = await self._download("rxdata.bin?pos=%d&len=%d" % (self._rxptr, nBytes))
        bufflen = len(buff) - 1
        endpos = 0
        mult = 1
        while (bufflen > 0) and(buff[bufflen] != 64):
            endpos = endpos + mult * (buff[bufflen] - 48)
            mult = mult * 10
            bufflen = bufflen - 1
        self._rxptr = endpos
        res = ""
        ofs = 0
        while ofs + 3 < bufflen:
            res = "%s%02X%02X%02X%02X" % (res, buff[ofs], buff[ofs + 1], buff[ofs + 2], buff[ofs + 3])
            ofs = ofs + 4
        while ofs < bufflen:
            res = "%s%02X" % (res, buff[ofs])
            ofs = ofs + 1
        return res

    async def sendBreak(self, duration: int) -> int:
        """
        Emits a BREAK condition on the serial interface. When the specified
        duration is 0, the BREAK signal will be exactly one character wide.
        When the duration is between 1 and 100, the BREAK condition will
        be hold for the specified number of milliseconds.

        @param duration : 0 for a standard BREAK, or duration between 1 and 100 ms

        @return YAPI.SUCCESS if the call succeeds.

        On failure, throws an exception or returns a negative error code.
        """
        return await self.sendCommand("B%d" % duration)

    async def set_RTS(self, val: int) -> int:
        """
        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.
        """
        return await self.sendCommand("R%d" % val)

    async def get_CTS(self) -> int:
        """
        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.
        """
        buff: xarray
        res: int

        buff = await self._download("cts.txt")
        if not (len(buff) == 1):
            self._throw(YAPI.IO_ERROR, "invalid CTS reply")
            return YAPI.IO_ERROR
        res = buff[0] - 48
        return res

    async def snoopMessagesEx(self, maxWait: int, maxMsg: int) -> list[YSnoopingRecord]:
        """
        Retrieves messages (both direction) in the serial port buffer, starting at current position.
        This function will only compare and return printable characters in the message strings.
        Binary protocols are handled as hexadecimal strings.

        If no message is found, the search waits for one up to the specified maximum timeout
        (in milliseconds).

        @param maxWait : the maximum number of milliseconds to wait for a message if none is found
                in the receive buffer.
        @param maxMsg : the maximum number of messages to be returned by the function; up to 254.

        @return an array of YSnoopingRecord objects containing the messages found, if any.
                Binary messages are converted to hexadecimal representation.

        On failure, throws an exception or returns an empty array.
        """
        url: str
        msgbin: xarray
        msgarr: list[xarray] = []
        msglen: int
        res: Union[list[YSnoopingRecord], None] = []
        idx: int

        url = "rxmsg.json?pos=%d&maxw=%d&t=0&len=%d" % (self._rxptr, maxWait, maxMsg)
        msgbin = await self._download(url)
        msgarr = self._json_get_array(msgbin)
        msglen = len(msgarr)
        if msglen == 0:
            return res
        # last element of array is the new position
        msglen = msglen - 1
        self._rxptr = self._decode_json_int(msgarr[msglen])
        idx = 0

        while idx < msglen:
            res.append(YSnoopingRecord(msgarr[idx].decode('latin-1')))
            idx = idx + 1

        return res

    async def snoopMessages(self, maxWait: int) -> list[YSnoopingRecord]:
        """
        Retrieves messages (both direction) in the serial port buffer, starting at current position.
        This function will only compare and return printable characters in the message strings.
        Binary protocols are handled as hexadecimal strings.

        If no message is found, the search waits for one up to the specified maximum timeout
        (in milliseconds).

        @param maxWait : the maximum number of milliseconds to wait for a message if none is found
                in the receive buffer.

        @return an array of YSnoopingRecord objects containing the messages found, if any.
                Binary messages are converted to hexadecimal representation.

        On failure, throws an exception or returns an empty array.
        """
        return await self.snoopMessagesEx(maxWait, 255)

    async def registerSnoopingCallback(self, callback: YSnoopingCallback) -> int:
        """
        Registers a callback function to be called each time that a message is sent or
        received by the serial port. 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 None pointer as argument.

        @param callback : the callback function to call, or a None pointer.
                The callback function should take four arguments:
                the YSerialPort object that emitted the event, and
                the YSnoopingRecord object that describes the message
                sent or received.
                On failure, throws an exception or returns a negative error code.
        """
        if callback:
            await self.registerValueCallback(yInternalEventCallback)
        else:
            await self.registerValueCallback(None)
        # register user callback AFTER the internal pseudo-event,
        # to make sure we start with future events only
        self._eventCallback = callback
        return 0

    async def _internalEventHandler(self, advstr: str) -> int:
        url: str
        msgbin: xarray
        msgarr: list[xarray] = []
        msglen: int
        idx: int
        if not (self._eventCallback):
            # first simulated event, use it only to initialize reference values
            self._eventPos = 0

        url = "rxmsg.json?pos=%d&maxw=0&t=0" % self._eventPos
        msgbin = await self._download(url)
        msgarr = self._json_get_array(msgbin)
        msglen = len(msgarr)
        if msglen == 0:
            return YAPI.SUCCESS
        # last element of array is the new position
        msglen = msglen - 1
        if not (self._eventCallback):
            # first simulated event, use it only to initialize reference values
            self._eventPos = self._decode_json_int(msgarr[msglen])
            return YAPI.SUCCESS
        self._eventPos = self._decode_json_int(msgarr[msglen])
        idx = 0
        while idx < msglen:
            try:
                retval = self._eventCallback(self, YSnoopingRecord(msgarr[idx].decode('latin-1')))
                if retval is not None: await retval
            # noinspection PyBroadException
            except Exception as e:
                print('Exception in %s.snoopingCallback:' % type(self).__name__, type(e).__name__, e)
            idx = idx + 1
        return YAPI.SUCCESS

    async def writeStxEtx(self, text: str) -> int:
        """
        Sends an ASCII string to the serial port, preceeded with an STX code and
        followed by an ETX code.

        @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.
        """
        buff: xarray
        buff = xbytearray("%c%s%c" % (2, text, 3), 'latin-1')
        # send string using file upload
        return await self._upload("txdata", buff)

    async def writeMODBUS(self, hexString: str) -> int:
        """
        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.
        """
        return await self.sendCommand(":%s" % hexString)

    async def queryMODBUS(self, slaveNo: int, pduBytes: list[int]) -> list[int]:
        """
        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).
        """
        funCode: int
        nib: int
        i: int
        cmd: str
        prevpos: int
        url: str
        pat: str
        msgs: xarray
        reps: list[xarray] = []
        rep: str
        res: list[int] = []
        replen: int
        hexb: int
        funCode = pduBytes[0]
        nib = (funCode >> 4)
        pat = "%02X[%X%X]%X.*" % (slaveNo, nib, (nib+8), (funCode & 15))
        cmd = "%02X%02X" % (slaveNo, funCode)
        i = 1
        while i < len(pduBytes):
            cmd = "%s%02X" % (cmd, (pduBytes[i] & 0xff))
            i = i + 1
        if len(cmd) <= 80:
            # fast query
            url = "rxmsg.json?cmd=:%s&pat=:%s" % (cmd, pat)
        else:
            # long query
            prevpos = await self.end_tell()
            await self._upload("txdata:", YAPI._hexStrToBin(cmd))
            url = "rxmsg.json?pos=%d&maxw=2000&pat=:%s" % (prevpos, pat)

        msgs = await self._download(url)
        reps = self._json_get_array(msgs)
        if not (len(reps) > 1):
            self._throw(YAPI.IO_ERROR, "no reply from MODBUS slave")
            return res
        if len(reps) > 1:
            rep = self._json_get_string(reps[0])
            replen = ((len(rep) - 3) >> 1)
            i = 0
            while i < replen:
                hexb = int(rep[2 * i + 3: 2 * i + 3 + 2], 16)
                res.append(hexb)
                i = i + 1
            if res[0] != funCode:
                i = res[1]
                if not (i > 1):
                    self._throw(YAPI.NOT_SUPPORTED, "MODBUS error: unsupported function code")
                    return res
                if not (i > 2):
                    self._throw(YAPI.INVALID_ARGUMENT, "MODBUS error: illegal data address")
                    return res
                if not (i > 3):
                    self._throw(YAPI.INVALID_ARGUMENT, "MODBUS error: illegal data value")
                    return res
                if not (i > 4):
                    self._throw(YAPI.INVALID_ARGUMENT, "MODBUS error: failed to execute function")
                    return res
        return res

    async def modbusReadBits(self, slaveNo: int, pduAddr: int, nBits: int) -> list[int]:
        """
        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.
        """
        pdu: list[int] = []
        reply: list[int] = []
        res: list[int] = []
        bitpos: int
        idx: int
        val: int
        mask: int

        pdu.append(0x01)
        pdu.append((pduAddr >> 8))
        pdu.append((pduAddr & 0xff))
        pdu.append((nBits >> 8))
        pdu.append((nBits & 0xff))


        reply = await self.queryMODBUS(slaveNo, pdu)
        if len(reply) == 0:
            return res
        if reply[0] != pdu[0]:
            return res

        bitpos = 0
        idx = 2
        val = reply[idx]
        mask = 1
        while bitpos < nBits:
            if (val & mask) == 0:
                res.append(0)
            else:
                res.append(1)
            bitpos = bitpos + 1
            if mask == 0x80:
                idx = idx + 1
                val = reply[idx]
                mask = 1
            else:
                mask = (mask << 1)

        return res

    async def modbusReadInputBits(self, slaveNo: int, pduAddr: int, nBits: int) -> list[int]:
        """
        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.
        """
        pdu: list[int] = []
        reply: list[int] = []
        res: list[int] = []
        bitpos: int
        idx: int
        val: int
        mask: int

        pdu.append(0x02)
        pdu.append((pduAddr >> 8))
        pdu.append((pduAddr & 0xff))
        pdu.append((nBits >> 8))
        pdu.append((nBits & 0xff))


        reply = await self.queryMODBUS(slaveNo, pdu)
        if len(reply) == 0:
            return res
        if reply[0] != pdu[0]:
            return res

        bitpos = 0
        idx = 2
        val = reply[idx]
        mask = 1
        while bitpos < nBits:
            if (val & mask) == 0:
                res.append(0)
            else:
                res.append(1)
            bitpos = bitpos + 1
            if mask == 0x80:
                idx = idx + 1
                val = reply[idx]
                mask = 1
            else:
                mask = (mask << 1)

        return res

    async def modbusReadRegisters(self, slaveNo: int, pduAddr: int, nWords: int) -> list[int]:
        """
        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.
        """
        pdu: list[int] = []
        reply: list[int] = []
        res: list[int] = []
        regpos: int
        idx: int
        val: int
        if not (nWords<=256):
            self._throw(YAPI.INVALID_ARGUMENT, "Cannot read more than 256 words")
            return res

        pdu.append(0x03)
        pdu.append((pduAddr >> 8))
        pdu.append((pduAddr & 0xff))
        pdu.append((nWords >> 8))
        pdu.append((nWords & 0xff))


        reply = await self.queryMODBUS(slaveNo, pdu)
        if len(reply) == 0:
            return res
        if reply[0] != pdu[0]:
            return res

        regpos = 0
        idx = 2
        while regpos < nWords:
            val = (reply[idx] << 8)
            idx = idx + 1
            val = val + reply[idx]
            idx = idx + 1
            res.append(val)
            regpos = regpos + 1

        return res

    async def modbusReadInputRegisters(self, slaveNo: int, pduAddr: int, nWords: int) -> list[int]:
        """
        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.
        """
        pdu: list[int] = []
        reply: list[int] = []
        res: list[int] = []
        regpos: int
        idx: int
        val: int

        pdu.append(0x04)
        pdu.append((pduAddr >> 8))
        pdu.append((pduAddr & 0xff))
        pdu.append((nWords >> 8))
        pdu.append((nWords & 0xff))


        reply = await self.queryMODBUS(slaveNo, pdu)
        if len(reply) == 0:
            return res
        if reply[0] != pdu[0]:
            return res

        regpos = 0
        idx = 2
        while regpos < nWords:
            val = (reply[idx] << 8)
            idx = idx + 1
            val = val + reply[idx]
            idx = idx + 1
            res.append(val)
            regpos = regpos + 1

        return res

    async def modbusWriteBit(self, slaveNo: int, pduAddr: int, value: int) -> int:
        """
        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.
        """
        pdu: list[int] = []
        reply: list[int] = []
        res: int
        res = 0
        if value != 0:
            value = 0xff

        pdu.append(0x05)
        pdu.append((pduAddr >> 8))
        pdu.append((pduAddr & 0xff))
        pdu.append(value)
        pdu.append(0x00)


        reply = await self.queryMODBUS(slaveNo, pdu)
        if len(reply) == 0:
            return res
        if reply[0] != pdu[0]:
            return res
        res = 1
        return res

    async def modbusWriteBits(self, slaveNo: int, pduAddr: int, bits: list[int]) -> int:
        """
        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.
        """
        nBits: int
        nBytes: int
        bitpos: int
        val: int
        mask: int
        pdu: list[int] = []
        reply: list[int] = []
        res: int
        res = 0
        nBits = len(bits)
        nBytes = ((nBits + 7) >> 3)

        pdu.append(0x0f)
        pdu.append((pduAddr >> 8))
        pdu.append((pduAddr & 0xff))
        pdu.append((nBits >> 8))
        pdu.append((nBits & 0xff))
        pdu.append(nBytes)
        bitpos = 0
        val = 0
        mask = 1
        while bitpos < nBits:
            if bits[bitpos] != 0:
                val = (val | mask)
            bitpos = bitpos + 1
            if mask == 0x80:
                pdu.append(val)
                val = 0
                mask = 1
            else:
                mask = (mask << 1)
        if mask != 1:
            pdu.append(val)


        reply = await self.queryMODBUS(slaveNo, pdu)
        if len(reply) == 0:
            return res
        if reply[0] != pdu[0]:
            return res
        res = (reply[3] << 8)
        res = res + reply[4]
        return res

    async def modbusWriteRegister(self, slaveNo: int, pduAddr: int, value: int) -> int:
        """
        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.
        """
        pdu: list[int] = []
        reply: list[int] = []
        res: int
        res = 0

        pdu.append(0x06)
        pdu.append((pduAddr >> 8))
        pdu.append((pduAddr & 0xff))
        pdu.append((value >> 8))
        pdu.append((value & 0xff))


        reply = await self.queryMODBUS(slaveNo, pdu)
        if len(reply) == 0:
            return res
        if reply[0] != pdu[0]:
            return res
        res = 1
        return res

    async def modbusWriteRegisters(self, slaveNo: int, pduAddr: int, values: list[int]) -> int:
        """
        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.
        """
        nWords: int
        nBytes: int
        regpos: int
        val: int
        pdu: list[int] = []
        reply: list[int] = []
        res: int
        res = 0
        nWords = len(values)
        nBytes = 2 * nWords

        pdu.append(0x10)
        pdu.append((pduAddr >> 8))
        pdu.append((pduAddr & 0xff))
        pdu.append((nWords >> 8))
        pdu.append((nWords & 0xff))
        pdu.append(nBytes)
        regpos = 0
        while regpos < nWords:
            val = values[regpos]
            pdu.append((val >> 8))
            pdu.append((val & 0xff))
            regpos = regpos + 1


        reply = await self.queryMODBUS(slaveNo, pdu)
        if len(reply) == 0:
            return res
        if reply[0] != pdu[0]:
            return res
        res = (reply[3] << 8)
        res = res + reply[4]
        return res

    async def modbusWriteAndReadRegisters(self, slaveNo: int, pduWriteAddr: int, values: list[int], pduReadAddr: int, nReadWords: int) -> list[int]:
        """
        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.
        """
        nWriteWords: int
        nBytes: int
        regpos: int
        val: int
        idx: int
        pdu: list[int] = []
        reply: list[int] = []
        res: list[int] = []
        nWriteWords = len(values)
        nBytes = 2 * nWriteWords

        pdu.append(0x17)
        pdu.append((pduReadAddr >> 8))
        pdu.append((pduReadAddr & 0xff))
        pdu.append((nReadWords >> 8))
        pdu.append((nReadWords & 0xff))
        pdu.append((pduWriteAddr >> 8))
        pdu.append((pduWriteAddr & 0xff))
        pdu.append((nWriteWords >> 8))
        pdu.append((nWriteWords & 0xff))
        pdu.append(nBytes)
        regpos = 0
        while regpos < nWriteWords:
            val = values[regpos]
            pdu.append((val >> 8))
            pdu.append((val & 0xff))
            regpos = regpos + 1


        reply = await self.queryMODBUS(slaveNo, pdu)
        if len(reply) == 0:
            return res
        if reply[0] != pdu[0]:
            return res

        regpos = 0
        idx = 2
        while regpos < nReadWords:
            val = (reply[idx] << 8)
            idx = idx + 1
            val = val + reply[idx]
            idx = idx + 1
            res.append(val)
            regpos = regpos + 1

        return res

    # --- (end of generated code: YSerialPort implementation)
