fix esp32h2 pytest commissioning issue

examples/pytest_esp_matter_light.py

@@ -250,6 +250,8 @@ def test_matter_commissioning_h2(dut:Tuple[Dut, Dut]) -> None:
     ot_br.write('dataset active -x')
     dataset=ot_br.expect(r'\n(\w{202}\r)', timeout=5)[1].decode()
     print(dataset)
+    ot_br.expect('ot_ext_cli: Got IPv6 event: Interface "sta" address: fdde:ad00:beef:cafe', timeout=30)
+    print("Got unique local ipv6 address")
     # Start commissioning
     time.sleep(2)
     command = CHIP_TOOL_EXE + " pairing ble-thread 1 hex:{} ".format(dataset.strip())+"20202021 3840"