Set slave default to 0, as already documented in Modbus (#66921)

homeassistant/components/modbus/__init__.py

@@ -118,7 +118,7 @@ BASE_COMPONENT_SCHEMA = vol.Schema(
     {
         vol.Required(CONF_NAME): cv.string,
         vol.Required(CONF_ADDRESS): cv.positive_int,
-        vol.Optional(CONF_SLAVE): cv.positive_int,
+        vol.Optional(CONF_SLAVE, default=0): cv.positive_int,
         vol.Optional(
             CONF_SCAN_INTERVAL, default=DEFAULT_SCAN_INTERVAL
         ): cv.positive_int,

homeassistant/components/modbus/validators.py

@@ -209,8 +209,7 @@ def duplicate_entity_validator(config: dict) -> dict:
                     addr += "_" + str(entry[CONF_COMMAND_ON])
                 if CONF_COMMAND_OFF in entry:
                     addr += "_" + str(entry[CONF_COMMAND_OFF])
-                if CONF_SLAVE in entry:
-                    addr += "_" + str(entry[CONF_SLAVE])
+                addr += "_" + str(entry[CONF_SLAVE])
                 if addr in addresses:
                     err = f"Modbus {component}/{name} address {addr} is duplicate, second entry not loaded!"
                     _LOGGER.warning(err)

tests/components/modbus/conftest.py

@@ -9,7 +9,7 @@ from pymodbus.exceptions import ModbusException
 import pytest
 
 from homeassistant.components.modbus.const import MODBUS_DOMAIN as DOMAIN, TCP
-from homeassistant.const import CONF_HOST, CONF_NAME, CONF_PORT, CONF_TYPE
+from homeassistant.const import CONF_HOST, CONF_NAME, CONF_PORT, CONF_SLAVE, CONF_TYPE
 from homeassistant.setup import async_setup_component
 import homeassistant.util.dt as dt_util
 
@@ -82,9 +82,12 @@ async def mock_modbus_fixture(
 ):
     """Load integration modbus using mocked pymodbus."""
     conf = copy.deepcopy(do_config)
-    if config_addon:
-        for key in conf.keys():
+    for key in conf.keys():
+        if config_addon:
             conf[key][0].update(config_addon)
+        for entity in conf[key]:
+            if CONF_SLAVE not in entity:
+                entity[CONF_SLAVE] = 0
     caplog.set_level(logging.WARNING)
     config = {
         DOMAIN: [

tests/components/modbus/test_init.py

@@ -76,6 +76,7 @@ from homeassistant.const import (
     CONF_PORT,
     CONF_SCAN_INTERVAL,
     CONF_SENSORS,
+    CONF_SLAVE,
     CONF_STRUCTURE,
     CONF_TIMEOUT,
     CONF_TYPE,
@@ -272,10 +273,12 @@ async def test_duplicate_modbus_validator(do_config):
                     {
                         CONF_NAME: TEST_ENTITY_NAME,
                         CONF_ADDRESS: 117,
+                        CONF_SLAVE: 0,
                     },
                     {
                         CONF_NAME: TEST_ENTITY_NAME,
                         CONF_ADDRESS: 119,
+                        CONF_SLAVE: 0,
                     },
                 ],
             }
@@ -290,10 +293,12 @@ async def test_duplicate_modbus_validator(do_config):
                     {
                         CONF_NAME: TEST_ENTITY_NAME,
                         CONF_ADDRESS: 117,
+                        CONF_SLAVE: 0,
                     },
                     {
                         CONF_NAME: TEST_ENTITY_NAME + "2",
                         CONF_ADDRESS: 117,
+                        CONF_SLAVE: 0,
                     },
                 ],
             }
@@ -409,6 +414,7 @@ async def test_duplicate_entity_validator(do_config):
                 {
                     CONF_NAME: TEST_ENTITY_NAME,
                     CONF_ADDRESS: 117,
+                    CONF_SLAVE: 0,
                     CONF_SCAN_INTERVAL: 0,
                 }
             ],
@@ -544,6 +550,7 @@ async def mock_modbus_read_pymodbus_fixture(
                         CONF_INPUT_TYPE: do_type,
                         CONF_NAME: TEST_ENTITY_NAME,
                         CONF_ADDRESS: 51,
+                        CONF_SLAVE: 0,
                         CONF_SCAN_INTERVAL: do_scan_interval,
                     }
                 ],
@@ -688,6 +695,7 @@ async def test_delay(hass, mock_pymodbus):
                         CONF_INPUT_TYPE: CALL_TYPE_COIL,
                         CONF_NAME: TEST_ENTITY_NAME,
                         CONF_ADDRESS: 52,
+                        CONF_SLAVE: 0,
                         CONF_SCAN_INTERVAL: set_scan_interval,
                     },
                 ],
@@ -736,6 +744,7 @@ async def test_delay(hass, mock_pymodbus):
                 {
                     CONF_NAME: TEST_ENTITY_NAME,
                     CONF_ADDRESS: 117,
+                    CONF_SLAVE: 0,
                     CONF_SCAN_INTERVAL: 0,
                 }
             ],
@@ -759,6 +768,7 @@ async def test_shutdown(hass, caplog, mock_pymodbus, mock_modbus_with_pymodbus):
                 {
                     CONF_NAME: TEST_ENTITY_NAME,
                     CONF_ADDRESS: 51,
+                    CONF_SLAVE: 0,
                 }
             ]
         },