Fix/optional dependency nuttx

pytest-embedded-nuttx/README.md

@@ -1,17 +1,13 @@
 ### pytest-embedded-nuttx
 
-Pytest embedded service for NuttX project. alongside Espressif devices.
+Pytest embedded service for the NuttX project, compatible with Espressif devices.
 
-Using the 'nuttx' service alongside 'serial' allows writing and reading from
-the serial port, taking the NuttShell into consideration when running programs
-and even getting return codes.
+Using the 'nuttx' service alongside 'serial' enables reading from and writing to the serial port, taking NuttShell into account when running programs and retrieving return codes.
 
-While using pytest-embedded-nuttx allows you to communicate with serial
-devices and run simple tests, enabling the 'esp' service  adds extra capabilities for
-Espressif devices, such as flashing and device rebooting.
+The `nuttx` service provides basic serial communication and testing. Adding the 'esp' service enables further capabilities for Espressif devices, including flashing and device rebooting.
 
-Extra Functionalities:
+Additional Features:
 
-- `app`: Explore the NuttX binary directory and identify firmware and bootloader files.
-- `serial`: Parse the binary information and flash the board. Requires 'esp' service.
-- `dut`:  Send commands to device through serial port. Requires 'serial' service or 'esp' for Espressif devices.
+- `app`: Scans the NuttX binary directory to locate firmware and bootloader files.
+- `serial`: Parses binary information and flashes the board. Requires the 'esp' service.
+- `dut`: Sends commands to the device through the serial port. Requires the 'serial' service or 'esp' service for Espressif devices.

pytest-embedded-nuttx/pytest_embedded_nuttx/__init__.py

@@ -4,7 +4,6 @@
 
 from pytest_embedded.utils import lazy_load
 
-from .app import NuttxApp
 from .dut import NuttxDut, NuttxEspDut
 
 __getattr__ = lazy_load(

pytest-embedded-nuttx/pytest_embedded_nuttx/dut.py

@@ -1,12 +1,13 @@
 import logging
 import re
 from time import sleep
-from typing import AnyStr
+from typing import TYPE_CHECKING, AnyStr
 
 import pexpect
 from pytest_embedded_serial.dut import SerialDut
 
-from .app import NuttxApp
+if TYPE_CHECKING:
+    from .app import NuttxApp
 
 
 class NuttxDut(SerialDut):
@@ -83,7 +84,7 @@ class NuttxEspDut(NuttxDut):
 
     def __init__(
         self,
-        app: NuttxApp,
+        app: 'NuttxApp',
         **kwargs,
     ) -> None:
         self.target = app.target

pytest-embedded/pytest_embedded/plugin.py

@@ -129,6 +129,7 @@ def pytest_addoption(parser):
         '- qemu: use qemu simulator instead of the real target\n'
         '- arduino: auto-detect more app info with arduino specific rules, auto flash-in\n'
         '- wokwi: use wokwi simulator instead of the real target\n'
+        '- nuttx: service for nuttx project, optionally with espressif devices\n'
         'All the related CLI options are under the groups named by "embedded-<service>"',
     )
     base_group.addoption('--app-path', help='App path')