Python errno.ETIMEDOUT Examples

def test_listen_dep_not_atr_and_then_ioerror(self, device):
        atr_req = 'D4FF 30313233343536373839 00000000'
        atr_res = 'D501 d0d1d2d3d4d5d6d7d8d9 0000000800'
        device.chipset.transport.read.side_effect = [
            ACK(), RSP('19'),                           # ResetMode
            ACK(), RSP('09 00'),                        # WriteRegister
            ACK(), RSP('33'),                           # RFConfiguration
            ACK(), RSP('13'),                           # SetParameters
            ACK(), RSP('09 00'),                        # WriteRegister
            ACK(), RSP('8D 05 11' + atr_req),           # TgInitAsTarget
            ACK(), IOError(errno.ETIMEDOUT, ""),        # TgInitAsTarget
            ACK(), IOError(errno.EIO, ""),              # TgInitAsTarget
        ]
        target = nfc.clf.LocalTarget()
        target.sensf_res = HEX("01 01fe010203040506 0000000000000000 0000")
        target.sens_res = HEX("0101")
        target.sel_res = HEX("40")
        target.sdd_res = HEX("08010203")
        target.atr_res = HEX(atr_res)
        with pytest.raises(IOError):
            device.listen_dep(target, 1.0)
        assert device.chipset.transport.read.call_count == 16 

def init_database(self):
        """
        Initializes the database connection to MongoDB.
        Also pre-caches potentially heavy resources from the DB.
        :return:
        """
        self.log.info('Connecting to Database...')
        self.db = Database(self, self.cfg.db)
        try:
            await self.db[self.db.db_nam].collection.find_one({})
            if self.cfg.cache.type not in ['redis', 'mixed']:
                await self.db.precache_settings()
                await self.db.precache_profiles()
                await self.db.precache_resources()
            set_color_cache_coll(self.db[self.db.db_nam].ColorCache)
        except ServerSelectionTimeoutError:
            self.log.error('A Connection To The Database Host Failed!')
            exit(errno.ETIMEDOUT)
        except OperationFailure:
            self.log.error('Database Access Operation Failed!')
            exit(errno.EACCES)
        self.log.info('Successfully Connected to Database') 

def test_connect_ex_error(self):
        with support.transient_internet(REMOTE_HOST):
            s = ssl.wrap_socket(socket.socket(socket.AF_INET),
                                cert_reqs=ssl.CERT_REQUIRED,
                                ca_certs=REMOTE_ROOT_CERT)
            try:
                rc = s.connect_ex((REMOTE_HOST, 444))
                # Issue #19919: Windows machines or VMs hosted on Windows
                # machines sometimes return EWOULDBLOCK.
                errors = (
                    errno.ECONNREFUSED, errno.EHOSTUNREACH, errno.ETIMEDOUT,
                    errno.EWOULDBLOCK,
                )
                self.assertIn(rc, errors)
            finally:
                s.close() 

def acquire(self, block=True, timeout=None):
        if self.kind == RECURSIVE_MUTEX and self._is_mine():
            self.count += 1
            return True

        if block and timeout is None:
            res = pthread.sem_wait(self.handle)
        elif not block or timeout <= 0:
            res = pthread.sem_trywait(self.handle)
        else:
            res = _sem_timedwait(self.handle, timeout)
        if res < 0:
            e = ctypes.get_errno()
            if e == errno.EINTR:
                return None
            elif e in [errno.EAGAIN, errno.ETIMEDOUT]:
                return False
            raiseFromErrno()
        self.count += 1
        self.ident = get_ident()
        return True 

def _on_local_read(self):
        # handle all local read events and dispatch them to methods for
        # each stage
        self._update_activity()
        if not self._local_sock:
            return
        data = None
        try:
            data = self._local_sock.recv(BUF_SIZE)
        except (OSError, IOError) as e:
            if eventloop.errno_from_exception(e) in \
                    (errno.ETIMEDOUT, errno.EAGAIN, errno.EWOULDBLOCK):
                return
        if not data:
            self.destroy()
            return
        if not data:
            return
        self._server.server_transfer_ul += len(data)
        #TODO ============================================================
        if self._stage == STAGE_STREAM:
            self._write_to_sock(data, self._remote_sock)
            return 

def test_connect_ex_error(self):
        with support.transient_internet(REMOTE_HOST):
            s = ssl.wrap_socket(socket.socket(socket.AF_INET),
                                cert_reqs=ssl.CERT_REQUIRED,
                                ca_certs=REMOTE_ROOT_CERT)
            try:
                rc = s.connect_ex((REMOTE_HOST, 444))
                # Issue #19919: Windows machines or VMs hosted on Windows
                # machines sometimes return EWOULDBLOCK.
                errors = (
                    errno.ECONNREFUSED, errno.EHOSTUNREACH, errno.ETIMEDOUT,
                    errno.EWOULDBLOCK,
                )
                self.assertIn(rc, errors)
            finally:
                s.close() 

def read(self, timeout=0):
        if self.usb_inp is not None:
            try:
                ep_addr = self.usb_inp.getAddress()
                frame = self.usb_dev.bulkRead(ep_addr, 300, timeout)
            except libusb.USBErrorTimeout:
                raise IOError(errno.ETIMEDOUT, os.strerror(errno.ETIMEDOUT))
            except libusb.USBErrorNoDevice:
                raise IOError(errno.ENODEV, os.strerror(errno.ENODEV))
            except libusb.USBError as error:
                log.error("%r", error)
                raise IOError(errno.EIO, os.strerror(errno.EIO))

            if len(frame) == 0:
                log.error("bulk read returned zero data")
                raise IOError(errno.EIO, os.strerror(errno.EIO))

            frame = bytearray(frame)
            log.log(logging.DEBUG-1, "<<< %s", hexlify(frame).decode())
            return frame 

def send_rsp_recv_cmd(self, target, data, timeout):
        # print("\n".join(self._print_ciu_register_page(0, 1)))
        if target.tt3_cmd:
            return self._tt3_send_rsp_recv_cmd(target, data, timeout)
        try:
            if data:
                self.chipset.tg_response_to_initiator(data)
            return self.chipset.tg_get_initiator_command(timeout)
        except Chipset.Error as error:
            if error.errno in (0x0A, 0x29, 0x31):
                self.log.debug("Error: %s", error)
                raise nfc.clf.BrokenLinkError(str(error))
            else:
                self.log.warning(error)
                raise nfc.clf.TransmissionError(str(error))
        except IOError as error:
            if error.errno == errno.ETIMEDOUT:
                info = "no data received within %.3f s" % timeout
                self.log.debug(info)
                raise nfc.clf.TimeoutError(info)
            else:
                # host-controller communication broken
                self.log.error(error)
                raise error 

def _on_local_read(self):
        # handle all local read events and dispatch them to methods for
        # each stage
        self._update_activity()
        if not self._local_sock:
            return
        data = None
        try:
            data = self._local_sock.recv(BUF_SIZE)
        except (OSError, IOError) as e:
            if eventloop.errno_from_exception(e) in \
                    (errno.ETIMEDOUT, errno.EAGAIN, errno.EWOULDBLOCK):
                return
        if not data:
            self.destroy()
            return
        if not data:
            return
        self._server.server_transfer_ul += len(data)
        #TODO ============================================================
        if self._stage == STAGE_STREAM:
            self._write_to_sock(data, self._remote_sock)
            return 

def test_listen_tta_as_tt4_rcvd_deselect(self, device):
        device.chipset.transport.read.side_effect = [
            ACK(), RSP('09 00'),                        # WriteRegister
            ACK(), RSP('8D 00 E0 80'),                  # TgInitAsTarget
            ACK(), RSP('91 00'),                        # TgResponseToInitiator
            ACK(), RSP('89 00 C03233'),                 # TgGetInitiatorCommand
            ACK(), RSP('91 00'),                        # TgResponseToInitiator
            ACK(), IOError(errno.ETIMEDOUT, ""),        # TgInitAsTarget
        ]
        target = nfc.clf.LocalTarget('106A')
        target.sens_res = HEX("4400")
        target.sel_res = HEX("20")
        target.sdd_res = HEX("08010203")
        assert device.listen_tta(target, 1.0) is None
        assert device.chipset.transport.read.call_count == 12
        device.chipset.transport.write.assert_any_call(CMD('90 0578807002')) 

def test_listen_dep_ioerror_timeout_after_psl(self, device):
        atr_req = 'D400 30313233343536373839 00000000'
        atr_res = 'D501 d0d1d2d3d4d5d6d7d8d9 0000000800'
        psl_req = 'D404 00 12 03'
        device.chipset.transport.read.side_effect = [
            ACK(), RSP('09 00'),                        # WriteRegister
            ACK(), RSP('8D 05 11' + atr_req),           # TgInitAsTarget
            ACK(), RSP('91 00'),                        # TgResponseToInitiator
            ACK(), RSP('89 00 06' + psl_req),           # TgGetInitiatorCommand
            ACK(), self.reg_rsp('FD'),                  # ReadRegister
            ACK(), RSP('09 00'),                        # WriteRegister
            ACK(), RSP('91 00'),                        # TgResponseToInitiator
            ACK(), self.reg_rsp('FD'),                  # ReadRegister
            ACK(), RSP('09 00'),                        # WriteRegister
            ACK(), IOError(errno.ETIMEDOUT, ""),        # TgGetInitiatorCommand
        ]
        target = nfc.clf.LocalTarget()
        target.sensf_res = HEX("01 01fe010203040506 0000000000000000 0000")
        target.sens_res = HEX("0101")
        target.sel_res = HEX("40")
        target.sdd_res = HEX("08010203")
        target.atr_res = HEX(atr_res)
        assert device.listen_dep(target, 1.0) is None
        assert device.chipset.transport.read.call_count == 20 

def test_listen_dep_ioerror_timeout_after_atr(self, device):
        atr_req = 'D400 30313233343536373839 00000000'
        atr_res = 'D501 d0d1d2d3d4d5d6d7d8d9 0000000800'
        device.chipset.transport.read.side_effect = [
            ACK(), RSP('09 00'),                        # WriteRegister
            ACK(), RSP('8D 05 11' + atr_req),           # TgInitAsTarget
            ACK(), RSP('91 00'),                        # TgResponseToInitiator
            ACK(), IOError(errno.ETIMEDOUT, ""),        # TgGetInitiatorCommand
        ]
        target = nfc.clf.LocalTarget()
        target.sensf_res = HEX("01 01fe010203040506 0000000000000000 0000")
        target.sens_res = HEX("0101")
        target.sel_res = HEX("40")
        target.sdd_res = HEX("08010203")
        target.atr_res = HEX(atr_res)
        assert device.listen_dep(target, 1.0) is None
        assert device.chipset.transport.read.call_count == 8 

def test_send_cmd_recv_rsp_transport_error(self, device, err, exc):
        device.chipset.transport.read.side_effect = [
            ACK(), self.reg_rsp('00 00 00'),              # ReadRegister
            ACK(), RSP('09 00'),                          # WriteRegister
            ACK(), RSP('33'),                             # RFConfiguration
            ACK(), IOError(err, "test"),                  # InCommunicateThru
        ]
        target = nfc.clf.RemoteTarget('106A')
        with pytest.raises(exc):
            device.send_cmd_recv_rsp(target, b'123', 1.0)
        assert device.chipset.transport.write.mock_calls == [call(_) for _ in [
            CMD('06 6302 6303 6305'),                     # ReadRegister
            CMD('08 630200 630300 630540'),               # WriteRegister
            CMD('32 020a0b0f'),                           # RFConfiguration
            CMD('42 313233'),                             # InCommunicateThru
        ] + ([ACK()] if err == errno.ETIMEDOUT else [])] 

def test_listen_dep_not_atr_and_then_ioerror(self, device):
        atr_req = 'D4FF 30313233343536373839 00000000'
        atr_res = 'D501 d0d1d2d3d4d5d6d7d8d9 0000000800'
        device.chipset.transport.read.side_effect = [
            ACK(), RSP('09 00'),                        # WriteRegister
            ACK(), RSP('8D 05 11' + atr_req),           # TgInitAsTarget
            ACK(), IOError(errno.ETIMEDOUT, ""),        # TgInitAsTarget
            ACK(), IOError(errno.EIO, ""),              # TgInitAsTarget
        ]
        target = nfc.clf.LocalTarget()
        target.sensf_res = HEX("01 01fe010203040506 0000000000000000 0000")
        target.sens_res = HEX("0101")
        target.sel_res = HEX("40")
        target.sdd_res = HEX("08010203")
        target.atr_res = HEX(atr_res)
        with pytest.raises(IOError):
            device.listen_dep(target, 1.0)
        assert device.chipset.transport.read.call_count == 8 

def test_listen_dep_ioerror_timeout_after_atr(self, device):
        atr_req = 'D400 30313233343536373839 00000000'
        atr_res = 'D501 d0d1d2d3d4d5d6d7d8d9 0000000800'
        device.chipset.transport.read.side_effect = [
            ACK(), RSP('19'),                           # ResetMode
            ACK(), RSP('09 00'),                        # WriteRegister
            ACK(), RSP('33'),                           # RFConfiguration
            ACK(), RSP('13'),                           # SetParameters
            ACK(), RSP('09 00'),                        # WriteRegister
            ACK(), RSP('8D 05 11' + atr_req),           # TgInitAsTarget
            ACK(), RSP('93 00'),                        # TgSetGeneralBytes
            ACK(), IOError(errno.ETIMEDOUT, ""),        # TgGetInitiatorCommand
        ]
        target = nfc.clf.LocalTarget()
        target.sensf_res = HEX("01 01fe010203040506 0000000000000000 0000")
        target.sens_res = HEX("0101")
        target.sel_res = HEX("40")
        target.sdd_res = HEX("08010203")
        target.atr_res = HEX(atr_res)
        assert device.listen_dep(target, 1.0) is None
        assert device.chipset.transport.read.call_count == 16 

def read(self, timeout):
        if self.tty is not None:
            self.tty.timeout = max(timeout/1E3, 0.05)
            frame = bytearray(self.tty.read(6))
            if frame is None or len(frame) == 0:
                raise IOError(errno.ETIMEDOUT, os.strerror(errno.ETIMEDOUT))
            if frame.startswith(b"\x00\x00\xff\x00\xff\x00"):
                log.log(logging.DEBUG-1, "<<< %s", hexlify(frame).decode())
                return frame
            LEN = frame[3]
            if LEN == 0xFF:
                frame += self.tty.read(3)
                LEN = frame[5] << 8 | frame[6]
            frame += self.tty.read(LEN + 1)
            log.log(logging.DEBUG-1, "<<< %s", hexlify(frame).decode())
            return frame 

def handle_write_event(self):
        if _debug: TCPClient._debug("handle_write_event")

        # there might be an error
        err = self.socket.getsockopt(socket.SOL_SOCKET, socket.SO_ERROR)
        if _debug: TCPClient._debug("    - err: %r", err)

        # check for connection refused
        if err == 0:
            if not self.connected:
                if _debug: TCPClient._debug("    - connected")
                self.handle_connect()
        else:
            if _debug: TCPClient._debug("    - peer: %r", self.peer)

            if (err == errno.ECONNREFUSED):
                socket_error = socket.error(err, "connection refused")
            elif (err == errno.ETIMEDOUT):
                socket_error = socket.error(err, "timed out")
            elif (err == errno.EHOSTUNREACH):
                socket_error = socket.error(err, "host unreachable")
            else:
                socket_error = socket.error(err, "other unknown: %r" % (err,))
            if _debug: TCPClient._debug("    - socket_error: %r", socket_error)

            self.handle_error(socket_error)
            return

        # pass along
        asyncore.dispatcher.handle_write_event(self) 

def _on_local_read(self):
        # handle all local read events and dispatch them to methods for
        # each stage
        if not self._local_sock:
            return
        is_local = self._is_local
        data = None
        try:
            data = self._local_sock.recv(BUF_SIZE)
        except (OSError, IOError) as e:
            if eventloop.errno_from_exception(e) in \
                    (errno.ETIMEDOUT, errno.EAGAIN, errno.EWOULDBLOCK):
                return
        if not data:
            self.destroy()
            return
        self._update_activity(len(data))
        if not is_local:
            data = self._encryptor.decrypt(data)
            if not data:
                return
        if self._stage == STAGE_STREAM:
            if self._is_local:
                data = self._encryptor.encrypt(data)
            self._write_to_sock(data, self._remote_sock)
            return
        elif is_local and self._stage == STAGE_INIT:
            # TODO check auth method
            self._write_to_sock(b'\x05\00', self._local_sock)
            self._stage = STAGE_ADDR
            return
        elif self._stage == STAGE_CONNECTING:
            self._handle_stage_connecting(data)
        elif (is_local and self._stage == STAGE_ADDR) or \
                (not is_local and self._stage == STAGE_INIT):
            self._handle_stage_addr(data) 

def _on_remote_read(self):
        # handle all remote read events
        data = None
        try:
            data = self._remote_sock.recv(BUF_SIZE)

        except (OSError, IOError) as e:
            if eventloop.errno_from_exception(e) in \
                    (errno.ETIMEDOUT, errno.EAGAIN, errno.EWOULDBLOCK):
                return
        if not data:
            self.destroy()
            return
        self._update_activity(len(data))
        if self._is_local:
            data = self._encryptor.decrypt(data)
        else:
            data = self._encryptor.encrypt(data)
        try:
            self._write_to_sock(data, self._local_sock)
        except Exception as e:
            shell.print_exception(e)
            if self._config['verbose']:
                traceback.print_exc()
            # TODO use logging when debug completed
            self.destroy() 

def test_errno(self):
        """
        L{error.getConnectError} converts based on errno for C{socket.error}.
        """
        self.assertErrnoException(errno.ENETUNREACH, error.NoRouteError)
        self.assertErrnoException(errno.ECONNREFUSED, error.ConnectionRefusedError)
        self.assertErrnoException(errno.ETIMEDOUT, error.TCPTimedOutError)
        if platformType == "win32":
            self.assertErrnoException(errno.WSAECONNREFUSED, error.ConnectionRefusedError)
            self.assertErrnoException(errno.WSAENETUNREACH, error.NoRouteError) 

def test_errno(self):
        """
        L{error.getConnectError} converts based on errno for C{socket.error}.
        """
        self.assertErrnoException(errno.ENETUNREACH, error.NoRouteError)
        self.assertErrnoException(errno.ECONNREFUSED, error.ConnectionRefusedError)
        self.assertErrnoException(errno.ETIMEDOUT, error.TCPTimedOutError)
        if platformType == "win32":
            self.assertErrnoException(errno.WSAECONNREFUSED, error.ConnectionRefusedError)
            self.assertErrnoException(errno.WSAENETUNREACH, error.NoRouteError) 

def wait_for(test, timeout=1.0, raise_on_error=True, rate=100,
             timeout_msg="timeout expired", body=None):
    """
    Waits until some condition evaluates to true.

    @param test: zero param function to be evaluated
    @param timeout: max amount of time to wait. negative/inf for indefinitely
    @param raise_on_error: raise or just return False
    @param rate: the rate at which to check
    @param timout_msg: message to supply to the timeout exception
    @param body: optional function to execute while waiting
    """
    end_time = rospy.get_time() + timeout
    rate = rospy.Rate(rate)
    notimeout = (timeout < 0.0) or timeout == float("inf")
    while not test():
        if rospy.is_shutdown():
            if raise_on_error:
                raise OSError(errno.ESHUTDOWN, "ROS Shutdown")
            return False
        elif (not notimeout) and (rospy.get_time() >= end_time):
            if raise_on_error:
                raise OSError(errno.ETIMEDOUT, timeout_msg)
            return False
        if callable(body):
            body()
        rate.sleep()
    return True 

def run(self):
            while not self.stopped.wait(0):
                try:
                    cmd_args = self.api.recv()
                except (SocketError,
                        websocket._exceptions.WebSocketConnectionClosedException) as err:
                    cmd_args = None
                    if (hasattr(err, "errno") and err.errno in (errno.ECONNRESET, errno.ETIMEDOUT)
                            or "Connection is already closed." in str(err)):
                        while True:
                            # --stream-timeout will handle the timeout
                            try:
                                # reconnect on network issues
                                self.api.reconnect()
                                break
                            except websocket._exceptions.WebSocketAddressException:
                                # no connection available
                                reconnect_time_ws = 5
                                log.error("Local network issue, websocket reconnecting in {0}s".format(reconnect_time_ws))
                                sleep(reconnect_time_ws)
                    else:
                        raise
                except PluginError:
                    continue

                if not cmd_args:
                    continue
                if cmd_args["cmd"] == "warning":
                    log.warning("{code}: {message}", **cmd_args["args"])
                if cmd_args["cmd"] == "moduleInfo":
                    data = self.handle_module_info(cmd_args["args"])
                    if data:
                        self.data_chunks.append(data)
            log.debug("Stopped API polling") 

def testNonExistsError(self):
    non_exist_error = OSError(errno.ETIMEDOUT, 'This string not used')
    path = self.dir_tree[0]
    # record, replay
    os.mkdir(path).AndRaise(non_exist_error)
    self.mox.ReplayAll()
    # test, verify
    self.assertRaises(OSError, file_util.MkDirs, os.path.join(*self.dir_tree))
    self.mox.VerifyAll() 

def _on_local_read(self):
        # handle all local read events and dispatch them to methods for
        # each stage
        if not self._local_sock:
            return
        is_local = self._is_local
        data = None
        try:
            data = self._local_sock.recv(BUF_SIZE)
        except (OSError, IOError) as e:
            if eventloop.errno_from_exception(e) in \
                    (errno.ETIMEDOUT, errno.EAGAIN, errno.EWOULDBLOCK):
                return
        if not data:
            self.destroy()
            return
        self._update_activity(len(data))
        # ssserver接收到数据，则对其进行解密
        if not is_local:
            data = self._encryptor.decrypt(data)
            if not data:
                return
        if self._stage == STAGE_STREAM:
            if self._is_local:
                data = self._encryptor.encrypt(data)
            self._write_to_sock(data, self._remote_sock)
            return
        elif is_local and self._stage == STAGE_INIT:
            # 若未确认服务器，则先返回SOCKS代理的确认信息
            # '\x05' 为版本号 SOCKS5；'\x00' 表示无验证需求（即不用提供用户名以及密码）
            # TODO check auth method
            self._write_to_sock(b'\x05\00', self._local_sock)
            self._stage = STAGE_ADDR
            return
        elif self._stage == STAGE_CONNECTING:
            # 已连接远程服务器
            self._handle_stage_connecting(data)
        elif (is_local and self._stage == STAGE_ADDR) or \
                (not is_local and self._stage == STAGE_INIT):
            # 已给客户端回复确认信息 或 为ssserver且正处于初始化状态。
            self._handle_stage_addr(data) 

def _on_remote_read(self):
        # handle all remote read events
        data = None
        try:
            data = self._remote_sock.recv(BUF_SIZE)

        except (OSError, IOError) as e:
            if eventloop.errno_from_exception(e) in \
                    (errno.ETIMEDOUT, errno.EAGAIN, errno.EWOULDBLOCK):
                return
        if not data:
            self.destroy()
            return
        self._update_activity(len(data))
        # 本地服务器则解码数据
        if self._is_local:
            data = self._encryptor.decrypt(data)
        # 若是远程服务器则编码编码数据
        else:
            data = self._encryptor.encrypt(data)
        try:
            # 发送给local_sock
            self._write_to_sock(data, self._local_sock)
        except Exception as e:
            shell.print_exception(e)
            if self._config['verbose']:
                traceback.print_exc()
            # TODO use logging when debug completed
            self.destroy() 

def test_read(self, usb):
        usb.usb_dev.bulkRead.side_effect = [
            b'12',
            b'34',
            nfc.clf.transport.libusb.USBErrorTimeout,
            nfc.clf.transport.libusb.USBErrorNoDevice,
            nfc.clf.transport.libusb.USBError,
            b'',
        ]
        assert usb.read() == b'12'
        usb.usb_dev.bulkRead.assert_called_with(0x84, 300, 0)

        assert usb.read(100) == b'34'
        usb.usb_dev.bulkRead.assert_called_with(0x84, 300, 100)

        with pytest.raises(IOError) as excinfo:
            usb.read()
        assert excinfo.value.errno == errno.ETIMEDOUT

        with pytest.raises(IOError) as excinfo:
            usb.read()
        assert excinfo.value.errno == errno.ENODEV

        with pytest.raises(IOError) as excinfo:
            usb.read()
        assert excinfo.value.errno == errno.EIO

        with pytest.raises(IOError) as excinfo:
            usb.read()
        assert excinfo.value.errno == errno.EIO

        usb.usb_inp = None
        assert usb.read() is None 

def test_read(self, serial, tty):
        serial.return_value.read.side_effect = [
            HEX('0000ff00ff00'),
        ]
        assert tty.read(0) == b'\x00\x00\xff\x00\xff\x00'
        assert serial.return_value.read.mock_calls == [call(6)]
        assert tty.tty.timeout == 0.05

        serial.return_value.read.reset_mock()
        serial.return_value.read.side_effect = [
            HEX('0000ff03fbd5'), HEX('01020000'),
        ]
        assert tty.read(51) == b'\x00\x00\xff\x03\xfb\xd5\x01\x02\x00\x00'
        assert serial.return_value.read.mock_calls == [call(6), call(4)]
        assert tty.tty.timeout == 0.051

        serial.return_value.read.reset_mock()
        serial.return_value.read.side_effect = [
            HEX('0000ffffff01'), HEX('01fed5'), bytearray(256) + HEX('2b00'),
        ]
        tty.read(100)
        assert serial.return_value.read.mock_calls == [
            call(6), call(3), call(258),
        ]
        assert tty.tty.timeout == 0.1

        serial.return_value.read.reset_mock()
        serial.return_value.read.side_effect = [HEX('')]
        with pytest.raises(IOError) as excinfo:
            tty.read(1100)
        assert excinfo.value.errno == errno.ETIMEDOUT
        assert serial.return_value.read.mock_calls == [call(6)]
        assert tty.tty.timeout == 1.1

        tty.tty = None
        assert tty.read(1000) is None 

def receive(self, request=0, timeoutms=None):
        # receive into network buffer,
        # fill buffer once and decrypt
        # if request>0 wait blocking for request number of bytes (if timeout
        # given interrupt after timeoutms ms)
        # timeout==None: block
        # timeout==0: return immediately after trying to read something from
        #             network buffer
        # timeout>0: try for time specified to read something before returning
        #            this function always returns a pointer to the buffer and
        #            number of bytes read (could be 0)
        data = self.netbuf_in
        data_mv = self.netbuf_in_mv
        readbytes = 0
        start_t = ticks_ms()
        while readbytes < self.netbuf_size:
            try:
                if self.sock_read(data_mv[readbytes:readbytes + 1]):
                    readbytes += 1  # result was not 0 or none
                else:
                    if readbytes >= request:
                        break  # break if not blocking to request size
            except OSError as e:
                if len(e.args) > 0 \
                        and (e.args[0] == errno.EAGAIN
                             or e.args[0] == errno.ETIMEDOUT):
                    if readbytes >= request:
                        break  # break if not blocking to request size
                else:
                    raise
            if timeoutms is not None \
                    and ticks_diff(ticks_ms(), start_t) >= timeoutms:
                break
            sleep_ms(1)  # prevent busy waiting
        if readbytes > 0: self.crypt_in.decrypt(data, length=readbytes)
        return data, readbytes 

def _on_remote_read(self):
        # handle all remote read events
        data = None
        try:
            data = self._remote_sock.recv(BUF_SIZE)

        except (OSError, IOError) as e:
            if eventloop.errno_from_exception(e) in \
                    (errno.ETIMEDOUT, errno.EAGAIN, errno.EWOULDBLOCK):
                return
        if not data:
            self.destroy()
            return
        self._update_activity(len(data))
        if self._is_local:
            data = self._encryptor.decrypt(data)
        else:
            data = self._encryptor.encrypt(data)
        try:
            self._write_to_sock(data, self._local_sock)
        except Exception as e:
            shell.print_exception(e)
            if self._config['verbose']:
                traceback.print_exc()
            # TODO use logging when debug completed
            self.destroy()