[dua] completely remove DUA features and configurations (#13191)

This commit removes the OPENTHREAD_CONFIG_TMF_PROXY_DUA_ENABLE feature
and all associated code, tests, CLI commands, and harness references.

Changes:
- Removed OPENTHREAD_CONFIG_TMF_PROXY_DUA_ENABLE definition and all
  assert/preprocessor checks.
- Completely deleted dua_manager.cpp and dua_manager.hpp.
- Removed DUA registration notifying and request URI paths.
- Cleaned up all references to Domain Unicast Address (DUA) across
  child management, notifier, time ticker, and MLE.
- Removed DUA commands and logic from the CLI and Python cert tests
  (including packet verifier).
- Verified that the entire codebase compiles clean and all tests
  successfully pass using the Nexus test suite.

tools/harness-simulation/posix/config.yml

@@ -54,7 +54,6 @@ ot_build:
     - REST_API=0
     - OT_COMMISSIONER=1
     options:
-    - "-DOTBR_DUA_ROUTING=ON"
     - "-DOT_MLR=ON"
     rcp_subpath: build/ot12/simulation
     rcp_options:
@@ -72,7 +71,6 @@ ot_build:
     - REST_API=0
     - EXTERNAL_COMMISSIONER=1
     options:
-    - "-DOTBR_DUA_ROUTING=ON"
     - "-DOT_MLR=ON"
     rcp_subpath: build/ot13/simulation
     rcp_options:

tools/harness-thci/OpenThread.py

@@ -3086,37 +3086,6 @@ class OpenThreadTHCI(object):
         cmd = 'childip max %d' % int(num)
         self.__executeCommand(cmd)
 
-    @API
-    def config_next_dua_status_rsp(self, mliid, status_code):
-        if status_code >= 400:
-            # map status_code to correct COAP response code
-            a, b = divmod(status_code, 100)
-            status_code = ((a & 0x7) << 5) + (b & 0x1f)
-
-        cmd = 'bbr mgmt dua %d' % status_code
-
-        if mliid is not None:
-            mliid = mliid.replace(':', '')
-            cmd += ' %s' % mliid
-
-        self.__executeCommand(cmd)
-
-    @API
-    def getDUA(self):
-        dua = self.getGUA('fd00:7d03')
-        return dua
-
-    def __addDefaultDomainPrefix(self):
-        self.configBorderRouter(P_dp=1, P_stable=1, P_on_mesh=1, P_default=1)
-
-    def __setDUA(self, sDua):
-        """specify the DUA before Thread Starts."""
-        if isinstance(sDua, str):
-            sDua = sDua.decode('utf8')
-        iid = ipaddress.IPv6Address(sDua).packed[-8:]
-        cmd = 'dua iid %s' % ''.join('%02x' % ord(b) for b in iid)
-        return self.__executeCommand(cmd)[-1] == 'Done'
-
     def __getMlIid(self):
         """get the Mesh Local IID."""
         # getULA64() would return the full string representation
@@ -3130,10 +3099,6 @@ class OpenThreadTHCI(object):
         cmd = 'mliid %s' % sMlIid
         self.__executeCommand(cmd)
 
-    @API
-    def registerDUA(self, sAddr=''):
-        self.__setDUA(sAddr)
-
     @API
     def config_next_mlr_status_rsp(self, status_code):
         cmd = 'bbr mgmt mlr response %d' % status_code
@@ -3185,8 +3150,7 @@ class OpenThreadTHCI(object):
     @API
     def migrateNetwork(self, channel=None, net_name=None):
         """migrate to another Thread Partition 'net_name' (could be None)
-            on specified 'channel'. Make sure same Mesh Local IID and DUA
-            after migration for DUA-TC-06/06b (DEV-1923)
+            on specified 'channel'.
         """
         if channel is None:
             raise Exception('channel None')
@@ -3197,7 +3161,6 @@ class OpenThreadTHCI(object):
         print('new partition %s on channel %d' % (net_name, channel))
 
         mliid = self.__getMlIid()
-        dua = self.getDUA()
         self.reset()
         deviceRole = self.deviceRole
         self.setDefaultValues()
@@ -3205,7 +3168,6 @@ class OpenThreadTHCI(object):
         if net_name is not None:
             self.setNetworkName(net_name)
         self.__setMlIid(mliid)
-        self.__setDUA(dua)
         return self.joinNetwork(deviceRole)
 
     @API

tools/harness-thci/OpenThread_BR.py

@@ -357,14 +357,11 @@ class OpenThread_BR(OpenThreadTHCI, IThci):
         self.bash(cmd)
 
     @API
-    def setupHost(self, setDp=False, setDua=False):
+    def setupHost(self, setDp=False):
         self.IsHost = True
 
         self.bash('ip -6 addr add 910b::1 dev %s' % self.backboneNetif)
 
-        if setDua:
-            self.bash('ip -6 addr add fd00:7d03:7d03:7d03::1 dev %s' % self.backboneNetif)
-
         self.__startRadvdService(setDp)
 
     def _deviceEscapeEscapable(self, string):

tools/otci/otci/otci.py

@@ -2436,14 +2436,6 @@ class OTCI(object):
     #
 
     # TODO: bbr mgmt ...
-    def set_bbr_dua_response_status(self, status: int, mliid: Optional[str] = None):
-        """Set Backbone Router Data Unicast Address Response status/coap-code.
-
-        Only for testing/reference devices
-        """
-        _mliid = mliid if mliid is not None else ""
-        self.execute_command(f'bbr mgmt dua {status} {_mliid}')
-
     def set_bbr_mlr_response_status(self, status: int):
         """Set Backbone Router Multicast Listener Response status."""
         self.execute_command(f'bbr mgmt mlr response {status}')
@@ -2583,7 +2575,7 @@ class OTCI(object):
         return listeners
 
     #
-    # Thread 1.2 and DUA/MLR utilities
+    # Thread 1.2 and MLR utilities
     #
 
     def get_domain_name(self) -> str: