[tcat] implement decommissioning in tcat_agent (#10415)

Commits adds handling of TCAT TLV 0x60 `kTlvDecommission`.

tools/tcat_ble_client/bbtc.py

@@ -125,7 +125,8 @@ async def get_device_by_args(args):
     elif args.scan:
         tcat_devices = await ble_scanner.scan_tcat_devices()
         device = select_device_by_user_input(tcat_devices)
-        device = await BleStream.create(device.address, BBTC_SERVICE_UUID, BBTC_TX_CHAR_UUID, BBTC_RX_CHAR_UUID)
+        if device:
+            device = await BleStream.create(device.address, BBTC_SERVICE_UUID, BBTC_TX_CHAR_UUID, BBTC_RX_CHAR_UUID)
     elif args.simulation:
         device = UdpStream("127.0.0.1", int(args.simulation))
 

tools/tcat_ble_client/cli/base_commands.py

@@ -87,6 +87,22 @@ class CommissionCommand(Command):
         return CommandResultTLV(tlv_response)
 
 
+class DecommissionCommand(Command):
+
+    def get_help_string(self) -> str:
+        return 'Stop Thread interface and decommission device from current network.'
+
+    async def execute_default(self, args, context):
+        bless: BleStreamSecure = context['ble_sstream']
+        print('Disabling Thread and decommissioning device...')
+        data = (TLV(TcatTLVType.DECOMMISSION.value, bytes()).to_bytes())
+        response = await bless.send_with_resp(data)
+        if not response:
+            return
+        tlv_response = TLV.from_bytes(response)
+        return CommandResultTLV(tlv_response)
+
+
 class ThreadStartCommand(Command):
 
     def get_help_string(self) -> str:

tools/tcat_ble_client/cli/cli.py

@@ -29,7 +29,8 @@
 import readline
 import shlex
 from ble.ble_stream_secure import BleStreamSecure
-from cli.base_commands import (HelpCommand, HelloCommand, CommissionCommand, ThreadStateCommand, ScanCommand)
+from cli.base_commands import (HelpCommand, HelloCommand, CommissionCommand, DecommissionCommand, ThreadStateCommand,
+                               ScanCommand)
 from cli.dataset_commands import (DatasetCommand)
 from dataset.dataset import ThreadDataset
 from typing import Optional
@@ -42,6 +43,7 @@ class CLI:
             'help': HelpCommand(),
             'hello': HelloCommand(),
             'commission': CommissionCommand(),
+            'decommission': DecommissionCommand(),
             'dataset': DatasetCommand(),
             'thread': ThreadStateCommand(),
             'scan': ScanCommand(),