Modbus fixes to work with pymodbus 1.3.1 (#8365)

* Fixed a bug where changing fan speed was not possible

* Bump pymodbus version to 1.3.1 to fix issue #8285

* Changed all modbus components so that they use CONF_SLAVE from const.py

* Fix checking result from a modbus transaction

* Add missing decorator

* Added modbus write coil service and added descriptions

* Removed a hiding debug print

homeassistant/components/binary_sensor/modbus.py

@@ -49,6 +49,7 @@ class ModbusCoilSensor(BinarySensorDevice):
         self._coil = int(coil)
         self._value = None
 
+    @property
     def name(self):
         """Return the name of the sensor."""
         return self._name
@@ -61,4 +62,10 @@ class ModbusCoilSensor(BinarySensorDevice):
     def update(self):
         """Update the state of the sensor."""
         result = modbus.HUB.read_coils(self._slave, self._coil, 1)
-        self._value = result.bits[0]
+        try:
+            self._value = result.bits[0]
+        except AttributeError:
+            _LOGGER.error(
+                'No response from modbus slave %s coil %s',
+                self._slave,
+                self._coil)