fix(examples): Test the SLIP netif example on target as well

examples/esp_netif/slip_custom_netif/pytest_slip.py

@@ -0,0 +1,98 @@
+# SPDX-FileCopyrightText: 2025 Espressif Systems (Shanghai) CO LTD
+# SPDX-License-Identifier: Unlicense OR CC0-1.0
+from __future__ import print_function, unicode_literals
+
+import subprocess
+import time
+from threading import Event, Thread
+
+import netifaces
+
+
+def is_esp32(port):
+    """
+    Check if the given port is connected to an ESP32 using esptool.
+    """
+    try:
+        result = subprocess.run(
+            ['esptool.py', '--port', port, 'chip_id'],
+            stdout=subprocess.PIPE, stderr=subprocess.PIPE, check=True, text=True
+        )
+        return 'ESP32' in result.stdout
+    except subprocess.CalledProcessError:
+        return False
+
+
+def run_server(server_stop, port):
+    print('Launching SLIP netif on port: {}'.format(port))
+    try:
+        arg_list = ['sudo', 'slattach', '-v', '-L', '-s', '115200','-p', 'slip', port]
+        p = subprocess.Popen(arg_list, stdout=subprocess.PIPE, bufsize=1)
+        while not server_stop.is_set():
+            if p.poll() is not None:
+                if p.poll() == 16:
+                    print('[SLIP:] Terminated: hang-up received')
+                    break
+                else:
+                    raise ValueError(
+                        'ENV_TEST_FAILURE: SLIP terminated unexpectedly with {}'
+                        .format(p.poll()))
+            time.sleep(0.1)
+    except Exception as e:
+        print(e)
+        raise ValueError('ENV_TEST_FAILURE: Error running SLIP netif')
+    finally:
+        p.terminate()
+    print('SLIP netif stopped')
+
+
+def test_examples_protocol_slip(dut):
+
+    # the PPP test env is reused for SLIP test and it uses three ttyUSB's: two for ESP32 board and another one for the ppp server
+    server_port = None
+    for i in ['/dev/ttyUSB0', '/dev/ttyUSB1', '/dev/ttyUSB2']:
+        if i == dut.serial.port:
+            print(f'DUT port: {i}')
+        elif is_esp32(i):
+            print(f'Some other ESP32: {i}')
+        else:
+            print(f'Port for SLIP: {i}')
+            server_port = i
+    if server_port is None:
+        print('ENV_TEST_FAILURE: Cannot locate SLIP port')
+        raise
+    # Attach to the SLI netif
+    server_stop = Event()
+    t = Thread(target=run_server, args=(server_stop, server_port))
+    t.start()
+    try:
+        # Setups the SLIP interface
+        ppp_server_timeout = time.time() + 30
+        while 'sl0' not in netifaces.interfaces():
+            print(
+                "SLIP netif hasn't appear yet, list of active netifs:{}"
+                .format(netifaces.interfaces()))
+            time.sleep(0.5)
+            if time.time() > ppp_server_timeout:
+                raise ValueError(
+                    'ENV_TEST_FAILURE: SLIP netif failed to setup sl0 interface within timeout'
+                )
+        # Configure the SLIP interface with IP addresses of both ends
+        cmd = ['sudo', 'ifconfig', 'sl0', '10.0.0.1', 'dstaddr', '10.0.0.2']
+        try:
+            subprocess.run(cmd, check=True)
+            print('SLIP interface configured successfully.')
+        except subprocess.CalledProcessError as e:
+            print(f'Failed to configure SLIP interface: {e}')
+        # Ping the SLIP interface with 5 packets and 10 seconds timeout
+        cmd = ['ping', '10.0.0.2', '-c', '5', '-W', '10']
+        try:
+            subprocess.run(cmd, check=True)
+            print('Pinging SLIP interface successfully.')
+        except subprocess.CalledProcessError as e:
+            print(f'Failed to ping SLIP interface: {e}')
+            raise
+
+    finally:
+        server_stop.set()
+        t.join()

examples/esp_netif/slip_custom_netif/sdkconfig.ci

@@ -0,0 +1,6 @@
+CONFIG_IDF_TARGET="esp32c3"
+CONFIG_LWIP_PPP_SUPPORT=y
+CONFIG_LWIP_SLIP_SUPPORT=y
+CONFIG_EXAMPLE_IPV4=y
+CONFIG_EXAMPLE_UART_TX_PIN=6
+CONFIG_EXAMPLE_UART_RX_PIN=7