src/eric7/MicroPython/Devices/CircuitPythonDevices.py

# -*- coding: utf-8 -*-

# Copyright (c) 2019 - 2023 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing the device interface class for CircuitPython boards.
"""

import ast
import binascii
import json
import os
import shutil

from PyQt6.QtCore import QUrl, pyqtSlot
from PyQt6.QtNetwork import QNetworkReply, QNetworkRequest
from PyQt6.QtWidgets import QMenu

from eric7 import Globals, Preferences
from eric7.EricGui.EricOverrideCursor import EricOverrideCursor
from eric7.EricWidgets import EricFileDialog, EricMessageBox
from eric7.EricWidgets.EricApplication import ericApp
from eric7.SystemUtilities import FileSystemUtilities

from ..MicroPythonWidget import HAS_QTCHART
from . import FirmwareGithubUrls
from .CircuitPythonUpdater.CircuitPythonUpdaterInterface import (
    CircuitPythonUpdaterInterface,
    isCircupAvailable,
)
from .DeviceBase import BaseDevice


class CircuitPythonDevice(BaseDevice):
    """
    Class implementing the device for CircuitPython boards.
    """

    DeviceVolumeName = "CIRCUITPY"

    def __init__(self, microPythonWidget, deviceType, boardName, parent=None):
        """
        Constructor

        @param microPythonWidget reference to the main MicroPython widget
        @type MicroPythonWidget
        @param deviceType device type assigned to this device interface
        @type str
        @param boardName name of the board
        @type str
        @param parent reference to the parent object
        @type QObject
        """
        super().__init__(microPythonWidget, deviceType, parent)

        self._submitMode = "paste"  # use 'paste' mode to avoid loosing state

        self.__boardName = boardName
        self.__workspace = self.__findWorkspace()

        self.__updater = CircuitPythonUpdaterInterface(self)

        self.__createCPyMenu()

        self.__securityTranslations = {
            "OPEN": self.tr("open", "open WiFi network"),
            "WEP": "WEP",
            "WPA_PSK": "WPA",
            "WPA2_PSK": "WPA2",
            "WPA_WPA2_PSK": "WPA/WPA2",
            "WPA2_ENTERPRISE": "WPA2 (CCMP)",
            "WPA3_PSK": "WPA3",
            "WPA2_WPA3_PSK": "WPA2/WPA3",
        }
        self.__securityCode2AuthModeString = {
            0: "[wifi.AuthMode.OPEN]",
            1: "[wifi.AuthMode.WEP]",
            2: "[wifi.AuthMode.WPA, wifi.AuthMode.PSK]",
            3: "[wifi.AuthMode.WPA2, wifi.AuthMode.PSK]",
            4: "[wifi.AuthMode.WPA, wifi.AuthMode.WPA2, wifi.AuthMode.PSK]",
            5: "[wifi.AuthMode.WPA2, wifi.AuthMode.ENTERPRISE]",
            6: "[wifi.AuthMode.WPA3, wifi.AuthMode.PSK]",
            7: "[wifi.AuthMode.WPA2, wifi.AuthMode.WPA3, wifi.AuthMode.PSK]",
        }

    def setConnected(self, connected):
        """
        Public method to set the connection state.

        @param connected connection state
        @type bool
        """
        if not connected and self.__libraryMenu.isTearOffMenuVisible():
            self.__libraryMenu.hideTearOffMenu()

        if self.__flashMenu.isTearOffMenuVisible():
            self.__flashMenu.hideTearOffMenu()

        super().setConnected(connected)

    def setButtons(self):
        """
        Public method to enable the supported action buttons.
        """
        super().setButtons()

        self.microPython.setActionButtons(
            run=True, repl=True, files=True, chart=HAS_QTCHART
        )

    def forceInterrupt(self):
        """
        Public method to determine the need for an interrupt when opening the
        serial connection.

        @return flag indicating an interrupt is needed
        @rtype bool
        """
        return False

    def deviceName(self):
        """
        Public method to get the name of the device.

        @return name of the device
        @rtype str
        """
        return self.tr("CircuitPython")

    def canStartRepl(self):
        """
        Public method to determine, if a REPL can be started.

        @return tuple containing a flag indicating it is safe to start a REPL
            and a reason why it cannot.
        @rtype tuple of (bool, str)
        """
        return True, ""

    def canStartPlotter(self):
        """
        Public method to determine, if a Plotter can be started.

        @return tuple containing a flag indicating it is safe to start a
            Plotter and a reason why it cannot.
        @rtype tuple of (bool, str)
        """
        return True, ""

    def canRunScript(self):
        """
        Public method to determine, if a script can be executed.

        @return tuple containing a flag indicating it is safe to start a
            Plotter and a reason why it cannot.
        @rtype tuple of (bool, str)
        """
        return True, ""

    def runScript(self, script):
        """
        Public method to run the given Python script.

        @param script script to be executed
        @type str
        """
        pythonScript = script.split("\n")
        self.sendCommands(pythonScript)

    def canStartFileManager(self):
        """
        Public method to determine, if a File Manager can be started.

        @return tuple containing a flag indicating it is safe to start a
            File Manager and a reason why it cannot.
        @rtype tuple of (bool, str)
        """
        return True, ""

    def supportsLocalFileAccess(self):
        """
        Public method to indicate file access via a local directory.

        @return flag indicating file access via local directory
        @rtype bool
        """
        return self.__deviceVolumeMounted()

    def __deviceVolumeMounted(self):
        """
        Private method to check, if the device volume is mounted.

        @return flag indicated a mounted device
        @rtype bool
        """
        if self.__workspace and not os.path.exists(self.__workspace):
            self.__workspace = ""  # reset

        if self.__workspace and self.DeviceVolumeName not in self.__workspace:
            self.__workspace = ""  # reset

        return self.DeviceVolumeName in self.getWorkspace(silent=True)

    def __findDeviceDirectories(self, directories):
        """
        Private method to find the device directories associated with the
        current board name.

        @param directories list of directories to be checked
        @type list of str
        @return list of associated directories
        @rtype list of str
        """
        boardDirectories = []
        for directory in directories:
            bootFile = os.path.join(directory, "boot_out.txt")
            if os.path.exists(bootFile):
                with open(bootFile, "r") as f:
                    line = f.readline()
                if self.__boardName in line:
                    boardDirectories.append(directory)

        return boardDirectories

    def __findWorkspace(self, silent=False):
        """
        Private method to find the workspace directory.

        @param silent flag indicating silent operations (defaults to False)
        @type bool (optional)
        @return workspace directory used for saving files
        @rtype str
        """
        # Attempts to find the paths on the filesystem that represents the
        # plugged in CIRCUITPY boards.
        deviceDirectories = FileSystemUtilities.findVolume(
            self.DeviceVolumeName, findAll=True
        )

        if deviceDirectories:
            if len(deviceDirectories) == 1:
                return deviceDirectories[0]
            else:
                boardDirectories = self.__findDeviceDirectories(deviceDirectories)
                if len(boardDirectories) == 1:
                    return boardDirectories[0]
                elif len(boardDirectories) > 1:
                    return self.selectDeviceDirectory(boardDirectories)
                else:
                    return self.selectDeviceDirectory(deviceDirectories)
        else:
            # return the default workspace and give the user a warning (unless
            # silent mode is selected)
            if not silent:
                EricMessageBox.warning(
                    self.microPython,
                    self.tr("Workspace Directory"),
                    self.tr(
                        "Python files for CircuitPython can be edited in"
                        " place, if the device volume is locally"
                        " available. Such a volume was not found. In"
                        " place editing will not be available."
                    ),
                )

            return super().getWorkspace()

    def getWorkspace(self, silent=False):
        """
        Public method to get the workspace directory.

        @param silent flag indicating silent operations
        @type bool
        @return workspace directory used for saving files
        @rtype str
        """
        if self.__workspace:
            # return cached entry
            return self.__workspace
        else:
            self.__workspace = self.__findWorkspace(silent=silent)
            return self.__workspace

    def __createCPyMenu(self):
        """
        Private method to create the CircuitPython submenu.
        """
        self.__libraryMenu = QMenu(self.tr("Library Management"))
        self.__libraryMenu.aboutToShow.connect(self.__aboutToShowLibraryMenu)
        self.__libraryMenu.setTearOffEnabled(True)

        self.__flashMenu = self.__createFlashMenus()

        self.__cpyMenu = QMenu(self.tr("CircuitPython Functions"))
        self.__cpyMenu.addAction(
            self.tr("Show CircuitPython Versions"), self.__showCircuitPythonVersions
        )
        self.__cpyMenu.addSeparator()
        self.__flashCpyAct = self.__cpyMenu.addMenu(self.__flashMenu)
        self.__cpyMenu.addSeparator()
        self.__cpyMenu.addMenu(self.__libraryMenu)
        self.__cpyMenu.addSeparator()
        self.__resetAct = self.__cpyMenu.addAction(
            self.tr("Reset Device"), self.__resetDevice
        )

    def __createFlashMenus(self):
        """
        Private method to create the various menus to flash a CircuitPython firmware.

        @return reference to the created top level flash menu
        @rtype QMenu
        """
        menu = QMenu(self.tr("Flash CircuitPython Firmware"))
        menu.setTearOffEnabled(True)

        # UF2 devices
        menu.addAction(self.tr("UF2 Device"), self.__flashCircuitPython)
        menu.addSeparator()

        # ESP32 specific submenu
        self.__esp32FlashMenu = QMenu(self.tr("ESP32 Device"))
        self.__esp32FlashMenu.addAction(self.tr("Erase Flash"), self.__esp32EraseFlash)
        self.__esp32FlashMenu.addAction(
            self.tr("Flash MicroPython Firmware"), self.__esp32FlashPython
        )
        self.__esp32FlashMenu.addSeparator()
        self.__esp32FlashMenu.addAction(
            self.tr("Flash Additional Firmware"), self.__esp32FlashAddons
        )
        menu.addMenu(self.__esp32FlashMenu)

        # Teensy 4.0 and 4.1 specific submenu
        self.__teensyFlashMenu = QMenu(self.tr("Teensy Device"))
        self.__teensyFlashMenu.addAction(
            self.tr("CircuitPython Flash Instructions"),
            self.__showTeensyFlashInstructions,
        )
        act = self.__teensyFlashMenu.addAction(
            self.tr("Start 'Teensy Loader'"), self.__startTeensyLoader
        )
        act.setToolTip(
            self.tr("Start the 'Teensy Loader' application to flash the Teensy device.")
        )
        menu.addMenu(self.__teensyFlashMenu)

        return menu

    def addDeviceMenuEntries(self, menu):
        """
        Public method to add device specific entries to the given menu.

        @param menu reference to the context menu
        @type QMenu
        """
        connected = self.microPython.isConnected()
        linkConnected = self.microPython.isLinkConnected()

        self.__flashCpyAct.setEnabled(not linkConnected)
        self.__resetAct.setEnabled(connected)

        menu.addMenu(self.__cpyMenu)

    @pyqtSlot()
    def __aboutToShowLibraryMenu(self):
        """
        Private slot to populate the 'Library Management' menu.
        """
        self.__libraryMenu.clear()

        if isCircupAvailable():
            self.__updater.populateMenu(self.__libraryMenu)
        else:
            act = self.__libraryMenu.addAction(
                self.tr("Install Library Files"), self.__installLibraryFiles
            )
            act.setEnabled(self.__deviceVolumeMounted())
            act = self.__libraryMenu.addAction(
                self.tr("Install Library Package"),
                lambda: self.__installLibraryFiles(packageMode=True),
            )
            act.setEnabled(self.__deviceVolumeMounted())
            self.__libraryMenu.addSeparator()
            self.__libraryMenu.addAction(
                self.tr("Install 'circup' Package"),
                self.__updater.installCircup,
            )

    @pyqtSlot()
    def __resetDevice(self):
        """
        Private slot to reset the connected device.
        """
        if self.microPython.isConnected():
            self.microPython.deviceInterface().execute(
                "import microcontroller\nmicrocontroller.reset()\n",
                mode=self._submitMode,
            )

    def hasFlashMenuEntry(self):
        """
        Public method to check, if the device has its own flash menu entry.

        @return flag indicating a specific flash menu entry
        @rtype bool
        """
        return True

    @pyqtSlot()
    def __flashCircuitPython(self):
        """
        Private slot to flash a CircuitPython firmware to a device supporting UF2.
        """
        from ..UF2FlashDialog import UF2FlashDialog

        dlg = UF2FlashDialog(boardType="circuitpython")
        dlg.exec()

    @pyqtSlot()
    def __showTeensyFlashInstructions(self):
        """
        Private slot to show a message box because Teensy does not support
        the UF2 bootloader yet.
        """
        from .TeensyDevices import showTeensyFlashInstructions

        showTeensyFlashInstructions()

    @pyqtSlot()
    def __startTeensyLoader(self):
        """
        Private slot to start the 'Teensy Loader' application.

        Note: The application must be accessible via the application search path.
        """
        from .TeensyDevices import startTeensyLoader

        startTeensyLoader()

    @pyqtSlot()
    def __esp32EraseFlash(self):
        """
        Private slot to erase the flash of an ESP32 device.
        """
        from .EspDevices import eraseFlash

        eraseFlash(self.microPython.getCurrentPort())

    @pyqtSlot()
    def __esp32FlashPython(self):
        """
        Private slot to flash a MicroPython or CircuitPython firmware to an ESP32
        device.
        """
        from .EspDevices import flashPythonFirmware

        flashPythonFirmware(self.microPython.getCurrentPort())

    @pyqtSlot()
    def __esp32FlashAddons(self):
        """
        Private slot to flash additional firmware to an ESP32 device.
        """
        from .EspDevices import flashAddonFirmware

        flashAddonFirmware(self.microPython.getCurrentPort())

    @pyqtSlot()
    def __showCircuitPythonVersions(self):
        """
        Private slot to show the CircuitPython version of a connected device and
        the latest available one (from Github).
        """
        ui = ericApp().getObject("UserInterface")
        request = QNetworkRequest(QUrl(FirmwareGithubUrls["circuitpython"]))
        reply = ui.networkAccessManager().head(request)
        reply.finished.connect(lambda: self.__cpyVersionResponse(reply))

    @pyqtSlot(QNetworkReply)
    def __cpyVersionResponse(self, reply):
        """
        Private slot handling the response of the latest version request.

        @param reply reference to the reply object
        @type QNetworkReply
        """
        latestUrl = reply.url().toString()
        tag = latestUrl.rsplit("/", 1)[-1]
        latestVersion = Globals.versionToTuple(tag)

        cpyVersionStr = self.tr("unknown")
        cpyVersion = (0, 0, 0)
        if self.supportsLocalFileAccess():
            bootFile = os.path.join(self.getWorkspace(), "boot_out.txt")
            if os.path.exists(bootFile):
                with open(bootFile, "r") as f:
                    line = f.readline()
                cpyVersionStr = line.split(";")[0].split()[2]
                cpyVersion = Globals.versionToTuple(cpyVersionStr)
        if (
            cpyVersion == (0, 0, 0)
            and self._deviceData
            and self._deviceData["mpy_version"] != "unknown"
        ):
            # drive is not mounted or 'boot_out.txt' is missing but the device
            # is connected via the serial console
            cpyVersionStr = self._deviceData["mpy_version"]
            cpyVersion = Globals.versionToTuple(cpyVersionStr)

        msg = self.tr(
            "<h4>CircuitPython Version Information</h4>"
            "<table>"
            "<tr><td>Installed:</td><td>{0}</td></tr>"
            "<tr><td>Available:</td><td>{1}</td></tr>"
            "</table>"
        ).format(cpyVersionStr, tag)
        if cpyVersion < latestVersion and cpyVersion != (0, 0, 0):
            msg += self.tr("<p><b>Update available!</b></p>")

        EricMessageBox.information(
            None,
            self.tr("CircuitPython Version"),
            msg,
        )

    @pyqtSlot()
    def __installLibraryFiles(self, packageMode=False):
        """
        Private slot to install Python files into the onboard library.

        @param packageMode flag indicating to install a library package
            (defaults to False)
        @type bool (optional)
        """
        title = (
            self.tr("Install Library Package")
            if packageMode
            else self.tr("Install Library Files")
        )
        if not self.__deviceVolumeMounted():
            EricMessageBox.critical(
                self.microPython,
                title,
                self.tr(
                    """The device volume "<b>{0}</b>" is not available."""
                    """ Ensure it is mounted properly and try again."""
                ),
            )
            return

        target = os.path.join(self.getWorkspace(), "lib")
        # ensure that the library directory exists on the device
        if not os.path.isdir(target):
            os.makedirs(target)

        if packageMode:
            libraryPackage = EricFileDialog.getExistingDirectory(
                self.microPython,
                title,
                os.path.expanduser("~"),
                EricFileDialog.Option(0),
            )
            if libraryPackage:
                target = os.path.join(target, os.path.basename(libraryPackage))
                shutil.rmtree(target, ignore_errors=True)
                shutil.copytree(libraryPackage, target)
        else:
            libraryFiles = EricFileDialog.getOpenFileNames(
                self.microPython,
                title,
                os.path.expanduser("~"),
                self.tr(
                    "Compiled Python Files (*.mpy);;"
                    "Python Files (*.py);;"
                    "All Files (*)"
                ),
            )

            for libraryFile in libraryFiles:
                if os.path.exists(libraryFile):
                    shutil.copy2(libraryFile, target)

    def getDocumentationUrl(self):
        """
        Public method to get the device documentation URL.

        @return documentation URL of the device
        @rtype str
        """
        return Preferences.getMicroPython("CircuitPythonDocuUrl")

    def getDownloadMenuEntries(self):
        """
        Public method to retrieve the entries for the downloads menu.

        @return list of tuples with menu text and URL to be opened for each
            entry
        @rtype list of tuple of (str, str)
        """
        return [
            (
                self.tr("CircuitPython Firmware"),
                Preferences.getMicroPython("CircuitPythonFirmwareUrl"),
            ),
            (
                self.tr("CircuitPython Libraries"),
                Preferences.getMicroPython("CircuitPythonLibrariesUrl"),
            ),
        ]

    ##################################################################
    ## Methods below implement WiFi related methods
    ##################################################################

    def hasWifi(self):
        """
        Public method to check the availability of WiFi.

        @return tuple containing a flag indicating the availability of WiFi
            and the WiFi type (picow or pimoroni)
        @rtype tuple of (bool, str)
        @exception OSError raised to indicate an issue with the device
        """
        command = """
def has_wifi():
    try:
        import wifi
        if hasattr(wifi, 'radio'):
            return True, 'circuitpython'
    except ImportError:
        pass

    return False, ''

print(has_wifi())
del has_wifi
"""
        out, err = self._interface.execute(command, mode=self._submitMode)
        if err:
            raise OSError(self._shortError(err))
        return ast.literal_eval(out.decode("utf-8"))

    def getWifiData(self):
        """
        Public method to get data related to the current WiFi status.

        @return tuple of three dictionaries containing the WiFi status data
            for the WiFi client, access point and overall data
        @rtype tuple of (dict, dict, dict)
        @exception OSError raised to indicate an issue with the device
        """
        command = """
def wifi_status():
    import binascii
    import json
    import wifi

    r = wifi.radio

    station = {
        'active': r.enabled and r.ipv4_address is not None,
        'connected': r.ipv4_address is not None,
        'ifconfig': (
            str(r.ipv4_address) if r.ipv4_address else'0.0.0.0',
            str(r.ipv4_subnet) if r.ipv4_subnet else'0.0.0.0',
            str(r.ipv4_gateway) if r.ipv4_gateway else'0.0.0.0',
            str(r.ipv4_dns) if r.ipv4_dns else'0.0.0.0',
        ),
        'mac': binascii.hexlify(r.mac_address, ':').decode(),
        'hostname': r.hostname,
    }
    try:
        station['txpower'] = r.tx_power
    except AttributeError:
        pass
    try:
        if r.ap_info is not None:
            station.update({
                'ap_ssid': r.ap_info.ssid,
                'ap_bssid': binascii.hexlify(r.ap_info.bssid, ':'),
                'ap_rssi': r.ap_info.rssi,
                'ap_channel': r.ap_info.channel,
                'ap_country': r.ap_info.country,
            })
            authmode = r.ap_info.authmode
            station['ap_security'] = (
                '_'.join(str(x).split('.')[-1] for x in authmode)
                if isinstance(authmode, list)
                else authmode
            )
    except (NotImplementedError, AttributeError):
        pass
    print(json.dumps(station))

    ap = {
        'active': r.enabled and r.ipv4_address_ap is not None,
        'connected': r.ipv4_address_ap is not None,
        'ifconfig': (
            str(r.ipv4_address_ap) if r.ipv4_address_ap else'0.0.0.0',
            str(r.ipv4_subnet_ap) if r.ipv4_subnet_ap else'0.0.0.0',
            str(r.ipv4_gateway_ap) if r.ipv4_gateway_ap else'0.0.0.0',
            str(r.ipv4_dns) if r.ipv4_dns else'0.0.0.0',
        ),
        'mac': binascii.hexlify(r.mac_address_ap, ':').decode(),
        'hostname': r.hostname,
    }
    try:
        ap['txpower'] = r.tx_power
    except AttributeError:
        pass
    print(json.dumps(ap))

    overall = {
        'active': r.enabled
    }
    print(json.dumps(overall))

wifi_status()
del wifi_status
"""

        out, err = self._interface.execute(command, mode=self._submitMode)
        if err:
            raise OSError(self._shortError(err))

        stationStr, apStr, overallStr = out.decode("utf-8").splitlines()
        station = json.loads(stationStr)
        ap = json.loads(apStr)
        overall = json.loads(overallStr)
        if "ap_security" in station:
            try:
                station["ap_security"] = self.__securityTranslations[
                    station["ap_security"]
                ]
            except KeyError:
                station["ap_security"] = self.tr("unknown ({0})").format(
                    station["ap_security"]
                )

        return station, ap, overall

    def connectWifi(self, ssid, password):
        """
        Public method to connect a device to a WiFi network.

        @param ssid name (SSID) of the WiFi network
        @type str
        @param password password needed to connect
        @type str
        @return tuple containing the connection status and an error string
        @rtype tuple of (bool, str)
        """
        command = """
def connect_wifi(ssid, password):
    import json
    import wifi

    r = wifi.radio
    try:
        r.start_station()
        r.connect(ssid, password)
        status = 'connected'
    except Exception as exc:
        status = str(exc)

    print(json.dumps({{'connected': r.ipv4_address is not None, 'status': status}}))

connect_wifi({0}, {1})
del connect_wifi
""".format(
            repr(ssid),
            repr(password if password else ""),
        )

        with EricOverrideCursor():
            out, err = self._interface.execute(
                command, mode=self._submitMode, timeout=15000
            )
        if err:
            return False, err

        result = json.loads(out.decode("utf-8").strip())
        error = "" if result["connected"] else result["status"]

        return result["connected"], error

    def disconnectWifi(self):
        """
        Public method to disconnect a device from the WiFi network.

        @return tuple containing a flag indicating success and an error string
        @rtype tuple of (bool, str)
        """
        command = """
def disconnect_wifi():
    import json
    import wifi

    r = wifi.radio
    try:
        r.stop_station()
        status = ''
    except Exception as exc:
        status = str(exc)

    print(json.dumps({'success': status == '', 'status': status}))

disconnect_wifi()
del disconnect_wifi
"""

        out, err = self._interface.execute(command, mode=self._submitMode)
        if err:
            return False, err

        result = json.loads(out.decode("utf-8").strip())
        return result["success"], result["status"]

    def writeCredentials(self, ssid, password):
        """
        Public method to write the given credentials to the connected device and modify
        the start script to connect automatically.

        @param ssid SSID of the network to connect to
        @type str
        @param password password needed to authenticate
        @type str
        @return tuple containing a flag indicating success and an error message
        @rtype tuple of (bool, str)
        """
        if not self.__deviceVolumeMounted():
            return False, self.tr("The device volume is not available.")

        workspace = self.getWorkspace()

        if Globals.versionToTuple(self._deviceData["release"]) >= (8, 0, 0):
            # CircuitPython >= 8.0.0: generate 'settings.toml' file
            contents = (
                'CIRCUITPY_WIFI_SSID = "{0}"\nCIRCUITPY_WIFI_PASSWORD = "{1}"\n'.format(
                    ssid, password
                )
            )
            filename = os.path.join(workspace, "settings.toml")
            if os.path.exists(filename):
                ok = EricMessageBox.yesNo(
                    None,
                    self.tr("Write WiFi Credentials"),
                    self.tr(
                        """<p>The file <b>{0}</b> exists already. Shall it be"""
                        """ replaced?</p>"""
                    ).format(filename),
                    icon=EricMessageBox.Warning,
                )
                if not ok:
                    return False, self.tr("Aborted")
            try:
                with open(filename, "w") as f:
                    f.write(contents)
                    return True, ""
            except OSError as err:
                return False, str(err)

        else:
            # CircuitPython < 8.0.0: generate a secrets.py script
            # step 1: generate the secrets.py file
            contents = (
                'secrets = {{\n    "ssid": "{0}",\n    "password": "{1}",\n}}\n'.format(
                    ssid, password
                )
            )
            filename = os.path.join(workspace, "secrets.py")
            if os.path.exists(filename):
                ok = EricMessageBox.yesNo(
                    None,
                    self.tr("Write WiFi Credentials"),
                    self.tr(
                        """<p>The file <b>{0}</b> exists already. Shall it be"""
                        """ replaced?</p>"""
                    ).format(filename),
                    icon=EricMessageBox.Warning,
                )
                if not ok:
                    return False, self.tr("Aborted")
            # step 2: create the auto-connect script (wifi_connect.py)
            try:
                with open(filename, "w") as f:
                    f.write(contents)
            except OSError as err:
                return False, str(err)
            scriptFile = os.path.join(
                os.path.dirname(__file__), "MCUScripts", "circuitPy7WiFiConnect.py"
            )
            targetFile = os.path.join(workspace, "wifi_connect.py")
            try:
                shutil.copy2(scriptFile, targetFile)
            except OSError as err:
                return False, str(err)
            # Note: code.py will not be modified because the connection will be
            #       reset anyway
            return True, ""

    def removeCredentials(self):
        """
        Public method to remove the saved credentials from the connected device.

        @return tuple containing a flag indicating success and an error message
        @rtype tuple of (bool, str)
        """
        if not self.__deviceVolumeMounted():
            return False, self.tr("The device volume is not available.")

        workspace = self.getWorkspace()
        for name in ("settings.toml", "secrets.py"):
            filename = os.path.join(workspace, name)
            if os.path.exists(filename):
                os.remove(filename)

        return True, ""

    def checkInternet(self):
        """
        Public method to check, if the internet can be reached.

        @return tuple containing a flag indicating reachability and an error string
        @rtype tuple of (bool, str)
        """
        command = """
def check_internet():
    import ipaddress
    import wifi

    r = wifi.radio
    if r.ipv4_address is not None:
        ping = r.ping(ipaddress.IPv4Address("8.8.8.8"))
        print(ping is not None)
    else:
        print(False)

check_internet()
del check_internet
"""

        out, err = self._interface.execute(command, mode=self._submitMode)
        if err:
            return False, err

        return out.decode("utf-8").strip() == "True", ""

    def scanNetworks(self):
        """
        Public method to scan for available WiFi networks.

        @return tuple containing the list of available networks as a tuple of 'Name',
            'MAC-Address', 'channel', 'RSSI' and 'security' and an error string
        @rtype tuple of (list of tuple of (str, str, int, int, str), str)
        """
        command = """
def scan_networks():
    import wifi

    r = wifi.radio
    network_list = []
    enabled = r.enabled
    if not enabled:
        r.enabled = True
    for net in r.start_scanning_networks():
        network_list.append(
            (net.ssid, net.bssid, net.channel, net.rssi,
             '_'.join(str(x).split('.')[-1] for x in net.authmode))
        )
    r.stop_scanning_networks()
    if not enabled:
        r.enabled = False
    print(network_list)

scan_networks()
del scan_networks
"""

        out, err = self._interface.execute(
            command, mode=self._submitMode, timeout=15000
        )
        if err:
            return [], err

        networksList = ast.literal_eval(out.decode("utf-8"))
        networks = []
        seenNetworks = []
        for network in networksList:
            if network[0]:
                ssid = network[0]
                mac = binascii.hexlify(network[1], ":").decode("utf-8")
                channel = network[2]
                rssi = network[3]
                try:
                    security = self.__securityTranslations[network[4]]
                except KeyError:
                    security = self.tr("unknown ({0})").format(network[4])
                if (ssid, mac, channel) not in seenNetworks:
                    seenNetworks.append((ssid, mac, channel))
                    networks.append((ssid, mac, channel, rssi, security))

        return networks, ""

    def deactivateInterface(self, interface):
        """
        Public method to deactivate a given WiFi interface of the connected device.

        Note: With CircuitPython it is not possible to deactivate the station and
        access point interfaces separately.

        @param interface designation of the interface to be deactivated (one of 'AP'
            or 'STA')
        @type str
        @return tuple containg a flag indicating success and an error message
        @rtype tuple of (bool, str)
        @exception ValueError raised to indicate a wrong value for the interface type
        """
        if interface not in ("STA", "AP"):
            raise ValueError(
                "interface must be 'AP' or 'STA', got '{0}'".format(interface)
            )

        command = """
def deactivate():
    import wifi

    wifi.radio.enabled = False
    print(not wifi.radio.enabled)

deactivate()
del deactivate
"""

        out, err = self._interface.execute(command, mode=self._submitMode)
        if err:
            return False, err
        else:
            return out.decode("utf-8").strip() == "True", ""

    def startAccessPoint(self, ssid, security=None, password=None, ifconfig=None):
        """
        Public method to start the access point interface.

        @param ssid SSID of the access point
        @type str
        @param security security method (defaults to None)
        @type int (optional)
        @param password password (defaults to None)
        @type str (optional)
        @param ifconfig IPv4 configuration for the access point if not default
            (IPv4 address, netmask, gateway address, DNS server address)
        @type tuple of (str, str, str, str)
        @return tuple containing a flag indicating success and an error message
        @rtype tuple of (bool, str)
        """
        if security is None or password is None:
            security = 0
            password = ""
        authmode = self.__securityCode2AuthModeString[security]

        if ifconfig:
            return (
                False,
                self.tr(
                    "CircuitPython does not support setting the IPv4 parameters of the"
                    " WiFi access point."
                ),
            )

        command = """
def start_ap(ssid, password):
    import wifi

    r = wifi.radio
    try:
        r.start_ap(ssid, password, authmode={2})
    except ValueError as exc:
        print('Error:', str(exc))

start_ap({0}, {1})
del start_ap
""".format(
            repr(ssid), repr(password), authmode
        )

        out, err = self._interface.execute(
            command, mode=self._submitMode, timeout=15000
        )
        if err:
            return False, err
        elif out and out.startswith(b"Error:"):
            return False, out.decode("utf-8").split(None, 1)[-1]
        else:
            return True, ""

    def stopAccessPoint(self):
        """
        Public method to stop the access point interface.

        @return tuple containg a flag indicating success and an error message
        @rtype tuple of (bool, str)
        """
        command = """
def stop_ap():
    import wifi

    r = wifi.radio
    try:
        r.stop_ap()
    except NotImplementedError as exc:
        print('Error:', str(exc))

stop_ap()
del stop_ap
"""

        out, err = self._interface.execute(command, mode=self._submitMode)
        if err:
            return False, err
        elif out and out.startswith(b"Error:"):
            return False, out.decode("utf-8").split(None, 1)[-1]
        else:
            return True, ""

    def getConnectedClients(self):
        """
        Public method to get a list of connected clients.

        @return a tuple containing a list of tuples containing the client MAC-Address
            and the RSSI (if supported and available) and an error message
        @rtype tuple of ([(bytes, int)], str)
        """
        return (
            [],
            self.tr("CircuitPython does not support reporting of connected clients"),
        )


def createDevice(microPythonWidget, deviceType, vid, pid, boardName, serialNumber):
    """
    Function to instantiate a MicroPython device object.

    @param microPythonWidget reference to the main MicroPython widget
    @type MicroPythonWidget
    @param deviceType device type assigned to this device interface
    @type str
    @param vid vendor ID
    @type int
    @param pid product ID
    @type int
    @param boardName name of the board
    @type str
    @param serialNumber serial number of the board
    @type str
    @return reference to the instantiated device object
    @rtype CircuitPythonDevice
    """
    return CircuitPythonDevice(microPythonWidget, deviceType, boardName)