diff --git a/rcon/__init__.py b/rcon/__init__.py
index b29a299..89b54e0 100644
--- a/rcon/__init__.py
+++ b/rcon/__init__.py
@@ -1,6 +1 @@
 """RCON client library."""
-
-from rcon.source import RequestIdMismatch, WrongPassword, Client, rcon
-
-
-__all__ = ['RequestIdMismatch', 'WrongPassword', 'Client', 'rcon']
diff --git a/rcon/battleye/__init__.py b/rcon/battleye/__init__.py
index 51c33c9..faae646 100644
--- a/rcon/battleye/__init__.py
+++ b/rcon/battleye/__init__.py
@@ -1 +1,6 @@
-"""BattlEye RCON implementation."""
\ No newline at end of file
+"""BattlEye RCON implementation."""
+
+from rcon.battleye.client import Client
+
+
+__all__ = ['Client']
diff --git a/rcon/battleye/client.py b/rcon/battleye/client.py
index 6de9f2e..ea36571 100644
--- a/rcon/battleye/client.py
+++ b/rcon/battleye/client.py
@@ -17,15 +17,18 @@ Host = Union[str, IPv4Address]
 class Client(BaseClient, socket_type=SOCK_DGRAM):
     """BattlEye RCon client."""
 
-    def communicate(self, data: bytes, *, recv: int = 4096) -> bytes:
+    def communicate(self, data: bytes, *, size: int = 4096) -> bytes:
         """Sends and receives packets."""
         self._socket.send(data)
-        return self._socket.recv(recv)
+        return self._socket.recv(size)
 
     def login(self, passwd: str) -> bytes:
         """Logs the user in."""
         return self.communicate(bytes(LoginRequest.from_passwd(passwd)))
 
-    def command(self, command: str) -> bytes:
+    def run(self, command: str, *args: str) -> str:
         """Executes a command."""
-        return self.communicate(bytes(Command.from_command(command)))
+        packet = Command.from_command(command, *args)
+        _ = self.communicate(bytes(packet))
+        # TODO: Process response
+        return ''
diff --git a/rcon/battleye/proto.py b/rcon/battleye/proto.py
index 6019e94..8189dea 100644
--- a/rcon/battleye/proto.py
+++ b/rcon/battleye/proto.py
@@ -99,6 +99,11 @@ class Command(NamedTuple):
         return Header.from_payload(self.payload)
 
     @classmethod
-    def from_command(cls, command: str):
-        """Creates a command packet from the given command."""
+    def from_string(cls, command: str):
+        """Creates a command packet from the given string."""
         return cls(0x01, 0x00, command)
+
+    @classmethod
+    def from_command(cls, command: str, *args: str):
+        """Creates a command packet from the command and arguments."""
+        return cls.from_string(' '.join([command, *args]))
diff --git a/rcon/client.py b/rcon/client.py
index 7b9fc07..6355fed 100644
--- a/rcon/client.py
+++ b/rcon/client.py
@@ -63,3 +63,7 @@ class BaseClient:
     def login(self, passwd: str) -> bool:
         """Performs a login."""
         raise NotImplementedError()
+
+    def run(self, command: str, *args: str) -> str:
+        """Runs a command."""
+        raise NotImplementedError()
diff --git a/rcon/source/config.py b/rcon/config.py
similarity index 97%
rename from rcon/source/config.py
rename to rcon/config.py
index b59ea57..f81860d 100644
--- a/rcon/source/config.py
+++ b/rcon/config.py
@@ -9,7 +9,7 @@ from os import getenv, name
 from pathlib import Path
 from typing import Iterable, NamedTuple, Optional, Union
 
-from rcon.source.exceptions import ConfigReadError, UserAbort
+from rcon.exceptions import ConfigReadError, UserAbort
 
 
 __all__ = ['CONFIG_FILES', 'LOG_FORMAT', 'SERVERS', 'Config', 'from_args']
diff --git a/rcon/source/console.py b/rcon/console.py
similarity index 85%
rename from rcon/source/console.py
rename to rcon/console.py
index 26eb6f0..ce82287 100644
--- a/rcon/source/console.py
+++ b/rcon/console.py
@@ -1,10 +1,11 @@
 """An interactive console."""
 
 from getpass import getpass
+from typing import Type
 
-from rcon.source.client import Client
-from rcon.source.config import Config
-from rcon.source.exceptions import RequestIdMismatch, WrongPassword
+from rcon.client import BaseClient
+from rcon.config import Config
+from rcon.exceptions import SessionTimeout, WrongPassword
 
 
 __all__ = ['PROMPT', 'rconcmd']
@@ -75,7 +76,7 @@ def get_config(host: str, port: int, passwd: str) -> Config:
     return Config(host, port, passwd)
 
 
-def login(client: Client, passwd: str) -> str:
+def login(client: BaseClient, passwd: str) -> str:
     """Performs a login."""
 
     while True:
@@ -89,7 +90,7 @@ def login(client: Client, passwd: str) -> str:
         return passwd
 
 
-def process_input(client: Client, passwd: str, prompt: str) -> bool:
+def process_input(client: BaseClient, passwd: str, prompt: str) -> bool:
     """Processes the CLI input."""
 
     try:
@@ -111,7 +112,7 @@ def process_input(client: Client, passwd: str, prompt: str) -> bool:
 
     try:
         result = client.run(command, *args)
-    except RequestIdMismatch:
+    except SessionTimeout:
         print(MSG_SESSION_TIMEOUT)
 
         try:
@@ -125,7 +126,10 @@ def process_input(client: Client, passwd: str, prompt: str) -> bool:
     return True
 
 
-def rconcmd(host: str, port: int, passwd: str, *, prompt: str = PROMPT):
+def rconcmd(
+        client_cls: Type[BaseClient], host: str, port: int, passwd: str, *,
+        prompt: str = PROMPT
+):
     """Initializes the console."""
 
     try:
@@ -136,7 +140,7 @@ def rconcmd(host: str, port: int, passwd: str, *, prompt: str = PROMPT):
 
     prompt = prompt.format(host=host, port=port)
 
-    with Client(host, port) as client:
+    with client_cls(host, port) as client:
         try:
             passwd = login(client, passwd)
         except EOFError:
diff --git a/rcon/source/errorhandler.py b/rcon/errorhandler.py
similarity index 81%
rename from rcon/source/errorhandler.py
rename to rcon/errorhandler.py
index 7892d18..92dbfe2 100644
--- a/rcon/source/errorhandler.py
+++ b/rcon/errorhandler.py
@@ -3,10 +3,10 @@
 from logging import Logger
 from socket import timeout
 
-from rcon.source.exceptions import ConfigReadError
-from rcon.source.exceptions import RequestIdMismatch
-from rcon.source.exceptions import UserAbort
-from rcon.source.exceptions import WrongPassword
+from rcon.exceptions import ConfigReadError
+from rcon.exceptions import SessionTimeout
+from rcon.exceptions import UserAbort
+from rcon.exceptions import WrongPassword
 
 
 __all__ = ['ErrorHandler']
@@ -18,7 +18,7 @@ ERRORS = {
     ConnectionRefusedError: (3, 'Connection refused.'),
     (TimeoutError, timeout): (4, 'Connection timed out.'),
     WrongPassword: (5, 'Wrong password.'),
-    RequestIdMismatch: (6, 'Session timed out.')
+    SessionTimeout: (6, 'Session timed out.')
 }
 
 
diff --git a/rcon/exceptions.py b/rcon/exceptions.py
new file mode 100644
index 0000000..4a04377
--- /dev/null
+++ b/rcon/exceptions.py
@@ -0,0 +1,24 @@
+"""Common exceptions."""
+
+__all__ = [
+    'ConfigReadError',
+    'SessionTimeout',
+    'UserAbort',
+    'WrongPassword'
+]
+
+
+class ConfigReadError(Exception):
+    """Indicates an error while reading the configuration."""
+
+
+class SessionTimeout(Exception):
+    """Indicates that the session timed out."""
+
+
+class UserAbort(Exception):
+    """Indicates that a required action has been aborted by the user."""
+
+
+class WrongPassword(Exception):
+    """Indicates a wrong password."""
diff --git a/rcon/source/gui.py b/rcon/gui.py
similarity index 86%
rename from rcon/source/gui.py
rename to rcon/gui.py
index 3621928..a0d2082 100644
--- a/rcon/source/gui.py
+++ b/rcon/gui.py
@@ -6,15 +6,16 @@ from logging import DEBUG, INFO, basicConfig, getLogger
 from os import getenv, name
 from pathlib import Path
 from socket import gaierror, timeout
-from typing import Iterable, NamedTuple
+from typing import Iterable, NamedTuple, Type
 
 from gi import require_version
 require_version('Gtk', '3.0')
 from gi.repository import Gtk
 
-from rcon.source.client import Client
-from rcon.source.config import LOG_FORMAT
-from rcon.source.exceptions import RequestIdMismatch, WrongPassword
+from rcon import battleye, source
+from rcon.client import BaseClient
+from rcon.config import LOG_FORMAT
+from rcon.exceptions import SessionTimeout, WrongPassword
 
 
 __all__ = ['main']
@@ -36,10 +37,18 @@ def get_args() -> Namespace:
     """Parses the command line arguments."""
 
     parser = ArgumentParser(description='A minimalistic, GTK-based RCON GUI.')
-    parser.add_argument('-d', '--debug', action='store_true',
-                        help='print additional debug information')
-    parser.add_argument('-t', '--timeout', type=float, metavar='seconds',
-                        help='connection timeout in seconds')
+    parser.add_argument(
+        '-B', '--battleye', action='store_true',
+        help='use BattlEye RCon instead of Source RCON'
+    )
+    parser.add_argument(
+        '-d', '--debug', action='store_true',
+        help='print additional debug information'
+    )
+    parser.add_argument(
+        '-t', '--timeout', type=float, metavar='seconds',
+        help='connection timeout in seconds'
+    )
     return parser.parse_args()
 
 
@@ -96,6 +105,11 @@ class GUI(Gtk.Window):  # pylint: disable=R0902
 
         self.load_gui_settings()
 
+    @property
+    def client_cls(self) -> Type[BaseClient]:
+        """Returns the client class."""
+        return battleye.Client if self.args.battleye else source.Client
+
     @property
     def result_text(self) -> str:
         """Returns the result text."""
@@ -141,7 +155,7 @@ class GUI(Gtk.Window):  # pylint: disable=R0902
     def load_gui_settings(self) -> None:
         """Loads the GUI settings from the cache file."""
         try:
-            with CACHE_FILE.open('r') as cache:
+            with CACHE_FILE.open('rb') as cache:
                 self.gui_settings = load(cache)
         except FileNotFoundError:
             LOGGER.warning('Cache file not found: %s', CACHE_FILE)
@@ -153,7 +167,7 @@ class GUI(Gtk.Window):  # pylint: disable=R0902
     def save_gui_settings(self):
         """Saves the GUI settings to the cache file."""
         try:
-            with CACHE_FILE.open('w') as cache:
+            with CACHE_FILE.open('wb') as cache:
                 dump(self.gui_settings, cache)
         except PermissionError:
             LOGGER.error('Insufficient permissions to read: %s', CACHE_FILE)
@@ -171,7 +185,7 @@ class GUI(Gtk.Window):  # pylint: disable=R0902
 
     def run_rcon(self) -> str:
         """Returns the current RCON settings."""
-        with Client(
+        with self.client_cls(
                 self.host.get_text().strip(),
                 self.port.get_value_as_int(),
                 timeout=self.args.timeout,
@@ -193,11 +207,8 @@ class GUI(Gtk.Window):  # pylint: disable=R0902
             self.show_error('Connection timed out.')
         except WrongPassword:
             self.show_error('Wrong password.')
-        except RequestIdMismatch as mismatch:
-            self.show_error(
-                'Request ID mismatch.\n'
-                f'Expected {mismatch.sent}, but got {mismatch.received}.'
-            )
+        except SessionTimeout:
+            self.show_error('Session timed out.')
         else:
             self.result_text = result
 
diff --git a/rcon/source/rconclt.py b/rcon/rconclt.py
similarity index 78%
rename from rcon/source/rconclt.py
rename to rcon/rconclt.py
index 145a7e6..253ec3e 100644
--- a/rcon/source/rconclt.py
+++ b/rcon/rconclt.py
@@ -4,9 +4,9 @@ from argparse import ArgumentParser, Namespace
 from logging import DEBUG, INFO, basicConfig, getLogger
 from pathlib import Path
 
-from rcon.source.client import Client
-from rcon.source.config import CONFIG_FILES, LOG_FORMAT, from_args
-from rcon.source.errorhandler import ErrorHandler
+from rcon import battleye, source
+from rcon.config import CONFIG_FILES, LOG_FORMAT, from_args
+from rcon.errorhandler import ErrorHandler
 
 
 __all__ = ['main']
@@ -20,6 +20,10 @@ def get_args() -> Namespace:
 
     parser = ArgumentParser(description='A Minecraft RCON client.')
     parser.add_argument('server', help='the server to connect to')
+    parser.add_argument(
+        '-B', '--battleye', action='store_true',
+        help='use BattlEye RCon instead of Source RCON'
+    )
     parser.add_argument(
         '-c', '--config', type=Path, metavar='file', default=CONFIG_FILES,
         help='the configuration file'
@@ -45,8 +49,9 @@ def run() -> None:
     args = get_args()
     basicConfig(format=LOG_FORMAT, level=DEBUG if args.debug else INFO)
     host, port, passwd = from_args(args)
+    client_cls = battleye.Client if args.battleye else source.Client
 
-    with Client(host, port, timeout=args.timeout) as client:
+    with client_cls(host, port, timeout=args.timeout) as client:
         client.login(passwd)
         text = client.run(args.command, *args.argument)
 
diff --git a/rcon/source/rconshell.py b/rcon/rconshell.py
similarity index 72%
rename from rcon/source/rconshell.py
rename to rcon/rconshell.py
index 4a7fa7a..e8c3f58 100644
--- a/rcon/source/rconshell.py
+++ b/rcon/rconshell.py
@@ -4,10 +4,11 @@ from argparse import ArgumentParser, Namespace
 from logging import INFO, basicConfig, getLogger
 from pathlib import Path
 
+from rcon import battleye, source
 from rcon.readline import CommandHistory
-from rcon.source.config import CONFIG_FILES, LOG_FORMAT, from_args
-from rcon.source.console import PROMPT, rconcmd
-from rcon.source.errorhandler import ErrorHandler
+from rcon.config import CONFIG_FILES, LOG_FORMAT, from_args
+from rcon.console import PROMPT, rconcmd
+from rcon.errorhandler import ErrorHandler
 
 
 __all__ = ['get_args', 'main']
@@ -21,6 +22,10 @@ def get_args() -> Namespace:
 
     parser = ArgumentParser(description='An interactive RCON shell.')
     parser.add_argument('server', nargs='?', help='the server to connect to')
+    parser.add_argument(
+        '-B', '--battleye', action='store_true',
+        help='use BattlEye RCon instead of Source RCON'
+    )
     parser.add_argument(
         '-c', '--config', type=Path, metavar='file', default=CONFIG_FILES,
         help='the configuration file'
@@ -37,6 +42,7 @@ def run() -> None:
 
     args = get_args()
     basicConfig(level=INFO, format=LOG_FORMAT)
+    client_cls = battleye.Client if args.battleye else source.Client
 
     if args.server:
         host, port, passwd = from_args(args)
@@ -44,7 +50,7 @@ def run() -> None:
         host = port = passwd = None
 
     with CommandHistory(LOGGER):
-        rconcmd(host, port, passwd, prompt=args.prompt)
+        rconcmd(client_cls, host, port, passwd, prompt=args.prompt)
 
 
 def main() -> int:
diff --git a/rcon/source/__init__.py b/rcon/source/__init__.py
index b58ae35..4d7e143 100644
--- a/rcon/source/__init__.py
+++ b/rcon/source/__init__.py
@@ -2,7 +2,6 @@
 
 from rcon.source.async_rcon import rcon
 from rcon.source.client import Client
-from rcon.source.exceptions import RequestIdMismatch, WrongPassword
 
 
-__all__ = ['RequestIdMismatch', 'WrongPassword', 'Client', 'rcon']
+__all__ = ['Client', 'rcon']
diff --git a/rcon/source/async_rcon.py b/rcon/source/async_rcon.py
index 7533377..10d4c70 100644
--- a/rcon/source/async_rcon.py
+++ b/rcon/source/async_rcon.py
@@ -2,7 +2,7 @@
 
 from asyncio import StreamReader, StreamWriter, open_connection
 
-from rcon.source.exceptions import RequestIdMismatch, WrongPassword
+from rcon.exceptions import SessionTimeout, WrongPassword
 from rcon.source.proto import Packet, Type
 
 
@@ -56,6 +56,6 @@ async def rcon(
     await close(writer)
 
     if response.id != request.id:
-        raise RequestIdMismatch(request.id, response.id)
+        raise SessionTimeout()
 
     return response.payload.decode(encoding)
diff --git a/rcon/source/client.py b/rcon/source/client.py
index dfe9437..82ff2f0 100644
--- a/rcon/source/client.py
+++ b/rcon/source/client.py
@@ -1,7 +1,7 @@
 """Synchronous client."""
 
 from rcon.client import BaseClient
-from rcon.source.exceptions import RequestIdMismatch, WrongPassword
+from rcon.exceptions import SessionTimeout, WrongPassword
 from rcon.source.proto import Packet, Type
 
 
@@ -44,6 +44,6 @@ class Client(BaseClient):
         response = self.communicate(request)
 
         if response.id != request.id:
-            raise RequestIdMismatch(request.id, response.id)
+            raise SessionTimeout()
 
         return response.payload.decode(encoding)
diff --git a/rcon/source/exceptions.py b/rcon/source/exceptions.py
index 9af01bb..2f42588 100644
--- a/rcon/source/exceptions.py
+++ b/rcon/source/exceptions.py
@@ -1,15 +1,6 @@
 """RCON exceptions."""
 
-__all__ = [
-    'ConfigReadError',
-    'RequestIdMismatch',
-    'UserAbort',
-    'WrongPassword'
-]
-
-
-class ConfigReadError(Exception):
-    """Indicates an error while reading the configuration."""
+__all__ = ['RequestIdMismatch']
 
 
 class RequestIdMismatch(Exception):
@@ -20,11 +11,3 @@ class RequestIdMismatch(Exception):
         super().__init__()
         self.sent = sent
         self.received = received
-
-
-class UserAbort(Exception):
-    """Indicates that a required action has been aborted by the user."""
-
-
-class WrongPassword(Exception):
-    """Indicates a wrong password."""
diff --git a/setup.py b/setup.py
index 0f37fcb..fa5217f 100755
--- a/setup.py
+++ b/setup.py
@@ -18,9 +18,9 @@ setup(
     extras_require={'GUI':  ['pygobject', 'pygtk']},
     entry_points={
         'console_scripts': [
-            'rcongui = rcon.source.gui:main',
-            'rconclt = rcon.source.rconclt:main',
-            'rconshell = rcon.source.rconshell:main',
+            'rcongui = rcon.gui:main',
+            'rconclt = rcon.rconclt:main',
+            'rconshell = rcon.rconshell:main',
         ],
     },
     url='https://github.com/conqp/rcon',