[cli] add API/CLI to support querying SRP server state (#6914)

tests/scripts/thread-cert/border_router/test_advertising_proxy.py

@@ -77,14 +77,17 @@ class SingleHostAndService(thread_cert.TestCase):
         server = self.nodes[BR]
         client = self.nodes[ROUTER]
 
+        server.srp_server_set_enabled(False)
         host.start(start_radvd=False)
         self.simulator.go(5)
 
+        self.assertEqual(server.srp_server_get_state(), 'disabled')
         server.srp_server_set_enabled(True)
         server.srp_server_set_lease_range(LEASE, LEASE, KEY_LEASE, KEY_LEASE)
         server.start()
-        self.simulator.go(5)
+        self.simulator.go(10)
         self.assertEqual('leader', server.get_state())
+        self.assertEqual(server.srp_server_get_state(), 'running')
 
         client.start()
         self.simulator.go(5)

tests/scripts/thread-cert/node.py

@@ -795,6 +795,11 @@ class NodeImpl:
         self.send_command(cmd)
         self._expect_done()
 
+    def srp_server_get_state(self):
+        states = ['disabled', 'running', 'stopped']
+        self.send_command('srp server state')
+        return self._expect_result(states)
+
     def srp_server_set_enabled(self, enable):
         cmd = f'srp server {"enable" if enable else "disable"}'
         self.send_command(cmd)

tests/scripts/thread-cert/test_netdata_publisher.py

@@ -268,7 +268,6 @@ class NetDataPublisher(thread_cert.TestCase):
         # MLE-EID address, then change to use specific address. Verify
         # that number of entries in network data is correct in each step
         # and that entries are switched correctly.
-
         num = 0
         for node in routers:
             node.netdata_publish_dnssrp_unicast_mleid(DNSSRP_PORT)
@@ -285,6 +284,14 @@ class NetDataPublisher(thread_cert.TestCase):
             self.assertEqual(len(services), min(num, DESIRED_NUM_DNSSRP_UNCIAST))
             self.verify_unicast_services(services)
 
+        for node in routers:
+            node.srp_server_set_enabled(True)
+            self.simulator.go(WAIT_TIME)
+        self.assertEqual(sum(node.srp_server_get_state() == 'running' for node in routers),
+                         min(len(routers), DESIRED_NUM_DNSSRP_UNCIAST))
+        self.assertEqual(sum(node.srp_server_get_state() == 'stopped' for node in routers),
+                         max(len(routers) - DESIRED_NUM_DNSSRP_UNCIAST, 0))
+
         for node in routers:
             node.netdata_unpublish_dnssrp()
             self.simulator.go(WAIT_TIME)
@@ -292,6 +299,9 @@ class NetDataPublisher(thread_cert.TestCase):
             services = leader.get_services()
             self.assertEqual(len(services), min(num, DESIRED_NUM_DNSSRP_UNCIAST))
             self.verify_unicast_services(services)
+        for node in routers:
+            node.srp_server_set_enabled(False)
+            self.assertEqual(node.srp_server_get_state(), 'disabled')
 
         #---------------------------------------------------------------------------------
         # DNS/SRP entries: Verify publisher preference when removing