[tcat] Fix handling certificate path in tcat client. (#10597)

Commit fixes propagation of certificate path from `cert-path` option
to `scan` command.

tools/tcat_ble_client/bbtc.py

@@ -96,7 +96,7 @@ async def main():
             quit_with_reason('TLS handshake failure')
 
     ds = ThreadDataset()
-    cli = CLI(ds, ble_sstream)
+    cli = CLI(ds, args, ble_sstream)
     loop = asyncio.get_running_loop()
     print('Enter \'help\' to see available commands' ' or \'exit\' to exit the application.')
     while True:

tools/tcat_ble_client/cli/base_commands.py

@@ -251,10 +251,11 @@ class ScanCommand(Command):
         print(f'Connecting to {device}')
         ble_stream = await BleStream.create(device.address, BBTC_SERVICE_UUID, BBTC_TX_CHAR_UUID, BBTC_RX_CHAR_UUID)
         ble_sstream = BleStreamSecure(ble_stream)
+        cert_path = context['cmd_args'].cert_path if context['cmd_args'] else 'auth'
         ble_sstream.load_cert(
-            certfile=path.join('auth', 'commissioner_cert.pem'),
-            keyfile=path.join('auth', 'commissioner_key.pem'),
-            cafile=path.join('auth', 'ca_cert.pem'),
+            certfile=path.join(cert_path, 'commissioner_cert.pem'),
+            keyfile=path.join(cert_path, 'commissioner_key.pem'),
+            cafile=path.join(cert_path, 'ca_cert.pem'),
         )
 
         print('Setting up secure channel...')

tools/tcat_ble_client/cli/cli.py

@@ -25,9 +25,9 @@
   ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   POSSIBILITY OF SUCH DAMAGE.
 """
-
 import readline
 import shlex
+from argparse import ArgumentParser
 from ble.ble_stream_secure import BleStreamSecure
 from cli.base_commands import (HelpCommand, HelloCommand, CommissionCommand, DecommissionCommand, GetDeviceIdCommand,
                                GetExtPanIDCommand, GetNetworkNameCommand, GetProvisioningUrlCommand, PingCommand,
@@ -39,7 +39,10 @@ from typing import Optional
 
 class CLI:
 
-    def __init__(self, dataset: ThreadDataset, ble_sstream: Optional[BleStreamSecure] = None):
+    def __init__(self,
+                 dataset: ThreadDataset,
+                 cmd_args: Optional[ArgumentParser] = None,
+                 ble_sstream: Optional[BleStreamSecure] = None):
         self._commands = {
             'help': HelpCommand(),
             'hello': HelloCommand(),
@@ -54,7 +57,12 @@ class CLI:
             'thread': ThreadStateCommand(),
             'scan': ScanCommand(),
         }
-        self._context = {'ble_sstream': ble_sstream, 'dataset': dataset, 'commands': self._commands}
+        self._context = {
+            'ble_sstream': ble_sstream,
+            'dataset': dataset,
+            'commands': self._commands,
+            'cmd_args': cmd_args
+        }
         readline.set_completer(self.completer)
         readline.parse_and_bind('tab: complete')