Set strict typing for modbus. (#56779)

.strict-typing

@@ -65,6 +65,7 @@ homeassistant.components.local_ip.*
 homeassistant.components.lock.*
 homeassistant.components.mailbox.*
 homeassistant.components.media_player.*
+homeassistant.components.modbus.*
 homeassistant.components.mysensors.*
 homeassistant.components.nam.*
 homeassistant.components.neato.*

mypy.ini

@@ -726,6 +726,17 @@ no_implicit_optional = true
 warn_return_any = true
 warn_unreachable = true
 
+[mypy-homeassistant.components.modbus.*]
+check_untyped_defs = true
+disallow_incomplete_defs = true
+disallow_subclassing_any = true
+disallow_untyped_calls = true
+disallow_untyped_decorators = true
+disallow_untyped_defs = true
+no_implicit_optional = true
+warn_return_any = true
+warn_unreachable = true
+
 [mypy-homeassistant.components.mysensors.*]
 check_untyped_defs = true
 disallow_incomplete_defs = true