Add parameter to delay sending of requests in modbus (#54203)

homeassistant/components/modbus/__init__.py

@@ -66,6 +66,7 @@ from .const import (
     CONF_INPUT_TYPE,
     CONF_MAX_TEMP,
     CONF_MIN_TEMP,
+    CONF_MSG_WAIT,
     CONF_PARITY,
     CONF_PRECISION,
     CONF_RETRIES,
@@ -283,6 +284,7 @@ MODBUS_SCHEMA = vol.Schema(
         vol.Optional(CONF_DELAY, default=0): cv.positive_int,
         vol.Optional(CONF_RETRIES, default=3): cv.positive_int,
         vol.Optional(CONF_RETRY_ON_EMPTY, default=False): cv.boolean,
+        vol.Optional(CONF_MSG_WAIT): cv.positive_int,
         vol.Optional(CONF_BINARY_SENSORS): vol.All(
             cv.ensure_list, [BINARY_SENSOR_SCHEMA]
         ),

homeassistant/components/modbus/const.py

@@ -30,6 +30,7 @@ CONF_INPUTS = "inputs"
 CONF_INPUT_TYPE = "input_type"
 CONF_MAX_TEMP = "max_temp"
 CONF_MIN_TEMP = "min_temp"
+CONF_MSG_WAIT = "message_wait_milliseconds"
 CONF_PARITY = "parity"
 CONF_REGISTER = "register"
 CONF_REGISTER_TYPE = "register_type"

homeassistant/components/modbus/modbus.py

@@ -39,6 +39,7 @@ from .const import (
     CONF_BAUDRATE,
     CONF_BYTESIZE,
     CONF_CLOSE_COMM_ON_ERROR,
+    CONF_MSG_WAIT,
     CONF_PARITY,
     CONF_RETRIES,
     CONF_RETRY_ON_EMPTY,
@@ -227,6 +228,12 @@ class ModbusHub:
                 self._pb_params["framer"] = ModbusRtuFramer
 
         Defaults.Timeout = client_config[CONF_TIMEOUT]
+        if CONF_MSG_WAIT in client_config:
+            self._msg_wait = client_config[CONF_MSG_WAIT] / 1000
+        elif self._config_type == CONF_SERIAL:
+            self._msg_wait = 30 / 1000
+        else:
+            self._msg_wait = 0
 
     def _log_error(self, text: str, error_state=True):
         log_text = f"Pymodbus: {text}"
@@ -322,7 +329,7 @@ class ModbusHub:
             result = await self.hass.async_add_executor_job(
                 self._pymodbus_call, unit, address, value, use_call
             )
-            if self._config_type == "serial":
+            if self._msg_wait:
                 # small delay until next request/response
-                await asyncio.sleep(30 / 1000)
+                await asyncio.sleep(self._msg_wait)
             return result

tests/components/modbus/test_init.py

@@ -40,6 +40,7 @@ from homeassistant.components.modbus.const import (
     CONF_BYTESIZE,
     CONF_DATA_TYPE,
     CONF_INPUT_TYPE,
+    CONF_MSG_WAIT,
     CONF_PARITY,
     CONF_STOPBITS,
     CONF_SWAP,
@@ -245,6 +246,7 @@ async def test_exception_struct_validator(do_config):
             CONF_PORT: "usb01",
             CONF_PARITY: "E",
             CONF_STOPBITS: 1,
+            CONF_MSG_WAIT: 100,
         },
         {
             CONF_TYPE: "serial",