[mlr] send BMLR.ntf on Backbone link (#5388)

This commit enhances Backbone Router to send BMLR.ntf on the backbone
link for Multicast Listeners.
- Send BMLR.ntf to the Backbone link
- Add Backbone test with packet verification
- Includes some revision to the Thread 1.2 Backbone CI scripts to make
  it more stable

tests/scripts/thread-cert/node.py

@@ -105,13 +105,17 @@ class OtbrDocker:
             '--cap-add=NET_ADMIN',
             '--volume',
             f'{self._rcp_device}:/dev/ttyUSB0',
+            '-v',
+            '/tmp/codecov.bash:/tmp/codecov.bash',
             config.OTBR_DOCKER_IMAGE,
+            '-B',
+            config.BACKBONE_IFNAME,
         ],
                                              stdin=subprocess.DEVNULL,
                                              stdout=sys.stdout,
                                              stderr=sys.stderr)
 
-        launch_docker_deadline = time.time() + 60
+        launch_docker_deadline = time.time() + 300
         launch_ok = False
 
         while time.time() < launch_docker_deadline:
@@ -121,7 +125,7 @@ class OtbrDocker:
                 logging.info("OTBR Docker %s Is Ready!", self._docker_name)
                 break
             except subprocess.CalledProcessError:
-                time.sleep(0.2)
+                time.sleep(5)
                 continue
 
         assert launch_ok
@@ -155,8 +159,7 @@ class OtbrDocker:
             if COVERAGE or OTBR_COVERAGE:
                 self.bash('service otbr-agent stop')
 
-                self.bash('curl https://codecov.io/bash -o codecov_bash --retry 5')
-                codecov_cmd = 'bash codecov_bash -Z'
+                codecov_cmd = 'bash /tmp/codecov.bash -Z'
                 # Upload OTBR code coverage if OTBR_COVERAGE=1, otherwise OpenThread code coverage.
                 if not OTBR_COVERAGE:
                     codecov_cmd += ' -R third_party/openthread/repo'
@@ -381,9 +384,6 @@ class OtCli:
         serialPort = '/dev/ttyUSB%d' % ((nodeid - 1) * 2)
         self.pexpect = fdpexpect.fdspawn(os.open(serialPort, os.O_RDWR | os.O_NONBLOCK | os.O_NOCTTY))
 
-    def __del__(self):
-        self.destroy()
-
     def destroy(self):
         if not self._initialized:
             return
@@ -609,6 +609,11 @@ class NodeImpl:
         self.send_command(cmd)
         self._expect('Done')
 
+    def commissioner_state(self):
+        states = [r'disabled', r'petitioning', r'active']
+        self.send_command('commissioner state')
+        return self._expect_result(states)
+
     def commissioner_add_joiner(self, addr, psk):
         cmd = 'commissioner joiner add %s %s' % (addr, psk)
         self.send_command(cmd)
@@ -1904,7 +1909,7 @@ class Node(NodeImpl, OtCli):
 
 class LinuxHost():
     PING_RESPONSE_PATTERN = re.compile(r'\d+ bytes from .*:.*')
-    ETH_DEV = 'eth0'
+    ETH_DEV = config.BACKBONE_IFNAME
 
     def get_ether_addrs(self):
         output = self.bash(f'ip -6 addr list dev {self.ETH_DEV}')