Allow pymodbus to reconnect in running system (not startup) (#53020)

Allow pymodbus to reconnect (not during startup).

homeassistant/components/modbus/modbus.py

@@ -249,17 +249,22 @@ class ModbusHub:
         for entry in self._pb_call.values():
             entry[ENTRY_FUNC] = getattr(self._client, entry[ENTRY_NAME])
 
+        await self.async_connect_task()
+        return True
+
+    async def async_connect_task(self):
+        """Try to connect, and retry if needed."""
         async with self._lock:
             if not await self.hass.async_add_executor_job(self._pymodbus_connect):
-                self._log_error("initial connect failed, no retry", error_state=False)
-                return False
+                err = f"{self._config_name} connect failed, retry in pymodbus"
+                self._log_error(err, error_state=False)
+                return
 
         # Start counting down to allow modbus requests.
         if self._config_delay:
             self._async_cancel_listener = async_call_later(
                 self.hass, self._config_delay, self.async_end_delay
             )
-        return True
 
     @callback
     def async_end_delay(self, args):
@@ -313,8 +318,6 @@ class ModbusHub:
             return None
         if not self._client:
             return None
-        if not self._client.is_socket_open():
-            return None
         async with self._lock:
             result = await self.hass.async_add_executor_job(
                 self._pymodbus_call, unit, address, value, use_call

tests/components/modbus/test_init.py

@@ -515,35 +515,6 @@ async def test_pymodbus_constructor_fail(hass, caplog):
         assert mock_pb.called
 
 
-@pytest.mark.parametrize(
-    "do_connect,do_exception,do_text",
-    [
-        [False, None, "initial connect failed, no retry"],
-        [True, ModbusException("no connect"), "Modbus Error: no connect"],
-    ],
-)
-async def test_pymodbus_connect_fail(
-    hass, do_connect, do_exception, do_text, caplog, mock_pymodbus
-):
-    """Run test for failing pymodbus connect."""
-    config = {
-        DOMAIN: [
-            {
-                CONF_TYPE: "tcp",
-                CONF_HOST: TEST_HOST,
-                CONF_PORT: 5501,
-            }
-        ]
-    }
-    caplog.set_level(logging.ERROR)
-    mock_pymodbus.connect.return_value = do_connect
-    mock_pymodbus.connect.side_effect = do_exception
-    assert await async_setup_component(hass, DOMAIN, config) is False
-    await hass.async_block_till_done()
-    assert caplog.messages[0].startswith(f"Pymodbus: {do_text}")
-    assert caplog.records[0].levelname == "ERROR"
-
-
 async def test_pymodbus_close_fail(hass, caplog, mock_pymodbus):
     """Run test for failing pymodbus close."""
     config = {
@@ -563,44 +534,6 @@ async def test_pymodbus_close_fail(hass, caplog, mock_pymodbus):
     # Close() is called as part of teardown
 
 
-async def test_disconnect(hass, mock_pymodbus):
-    """Run test for startup delay."""
-
-    # the purpose of this test is to test a device disconnect
-    # We "hijiack" a binary_sensor to make a proper blackbox test.
-    entity_id = f"{BINARY_SENSOR_DOMAIN}.{TEST_SENSOR_NAME}"
-    config = {
-        DOMAIN: [
-            {
-                CONF_TYPE: "tcp",
-                CONF_HOST: TEST_HOST,
-                CONF_PORT: 5501,
-                CONF_NAME: TEST_MODBUS_NAME,
-                CONF_BINARY_SENSORS: [
-                    {
-                        CONF_INPUT_TYPE: CALL_TYPE_COIL,
-                        CONF_NAME: f"{TEST_SENSOR_NAME}",
-                        CONF_ADDRESS: 52,
-                    },
-                ],
-            }
-        ]
-    }
-    mock_pymodbus.read_coils.return_value = ReadResult([0x01])
-    mock_pymodbus.is_socket_open.return_value = False
-    now = dt_util.utcnow()
-    with mock.patch("homeassistant.helpers.event.dt_util.utcnow", return_value=now):
-        assert await async_setup_component(hass, DOMAIN, config) is True
-        await hass.async_block_till_done()
-
-    # pass first scan_interval
-    now = now + timedelta(seconds=20)
-    with mock.patch("homeassistant.helpers.event.dt_util.utcnow", return_value=now):
-        async_fire_time_changed(hass, now)
-        await hass.async_block_till_done()
-        assert hass.states.get(entity_id).state == STATE_UNAVAILABLE
-
-
 async def test_delay(hass, mock_pymodbus):
     """Run test for startup delay."""