diff --git a/tools/tcat_ble_client/tlv/tlv.py b/tools/tcat_ble_client/tlv/tlv.py
new file mode 100644
index 000000000..75657c41a
--- /dev/null
+++ b/tools/tcat_ble_client/tlv/tlv.py
@@ -0,0 +1,71 @@
+"""
+  Copyright (c) 2024, The OpenThread Authors.
+  All rights reserved.
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+  1. Redistributions of source code must retain the above copyright
+     notice, this list of conditions and the following disclaimer.
+  2. Redistributions in binary form must reproduce the above copyright
+     notice, this list of conditions and the following disclaimer in the
+     documentation and/or other materials provided with the distribution.
+  3. Neither the name of the copyright holder nor the
+     names of its contributors may be used to endorse or promote products
+     derived from this software without specific prior written permission.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+  POSSIBILITY OF SUCH DAMAGE.
+"""
+
+from __future__ import annotations
+from typing import List
+
+
+class TLV():
+
+    def __init__(self, type: int = None, value: bytes = None):
+        self.type: int = type
+        self.value: bytes = value
+
+    def __str__(self):
+        return f'TLV\n\tTYPE:\t0x{self.type:02x}\n\tVALUE:\t{self.value}'
+
+    @staticmethod
+    def parse_tlvs(data: bytes) -> List[TLV]:
+        res: List[TLV] = []
+        while data:
+            next_tlv = TLV.from_bytes(data)
+            next_tlv_size = len(next_tlv.to_bytes())
+            data = data[next_tlv_size:]
+            res.append(next_tlv)
+        return res
+
+    @staticmethod
+    def from_bytes(data: bytes) -> TLV:
+        res = TLV()
+        res.set_from_bytes(data)
+        return res
+
+    def set_from_bytes(self, data: bytes):
+        self.type = data[0]
+        header_len = 2
+        if data[1] == 0xFF:
+            header_len = 4
+        length = int.from_bytes(data[1:header_len], byteorder='big')
+        self.value = data[header_len:header_len + length]
+
+    def to_bytes(self) -> bytes:
+        has_long_header = len(self.value) >= 255
+        header_len = 4 if has_long_header else 2
+        len_bytes = len(self.value).to_bytes(header_len - 1, byteorder='big')
+        header = bytes([self.type]) + len_bytes
+        return header + self.value
diff --git a/tools/tcat_ble_client/utils/__init__.py b/tools/tcat_ble_client/utils/__init__.py
new file mode 100644
index 000000000..d6d40bae9
--- /dev/null
+++ b/tools/tcat_ble_client/utils/__init__.py
@@ -0,0 +1,63 @@
+"""
+  Copyright (c) 2024, The OpenThread Authors.
+  All rights reserved.
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+  1. Redistributions of source code must retain the above copyright
+     notice, this list of conditions and the following disclaimer.
+  2. Redistributions in binary form must reproduce the above copyright
+     notice, this list of conditions and the following disclaimer in the
+     documentation and/or other materials provided with the distribution.
+  3. Neither the name of the copyright holder nor the
+     names of its contributors may be used to endorse or promote products
+     derived from this software without specific prior written permission.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+  POSSIBILITY OF SUCH DAMAGE.
+"""
+
+
+def get_int_in_range(min_value, max_value):
+    while True:
+        try:
+            user_input = int(input('> '))
+            if min_value <= user_input <= max_value:
+                return user_input
+            else:
+                print('The value is out of range. Try again.')
+        except ValueError:
+            print('The value is not an integer. Try again.')
+        except KeyboardInterrupt:
+            quit_with_reason('Program interrupted by user. Quitting.')
+
+
+def quit_with_reason(reason):
+    print(reason)
+    exit(1)
+
+
+def select_device_by_user_input(tcat_devices):
+    if tcat_devices:
+        print('Found devices:\n')
+        for i, device in enumerate(tcat_devices):
+            print(f'{i + 1}: {device.name} - {device.address}')
+    else:
+        print('\nNo devices found.')
+        return None
+
+    print('\nSelect the target number to connect to it.')
+    selected = get_int_in_range(1, len(tcat_devices))
+    device = tcat_devices[selected - 1]
+    print('Selected ', device)
+
+    return device