CI: update test cases to use different environment variables

change test environments
optimize asio udp server test
fix icmp echo test case
use ethernet_router env to run iperf test cases

examples/protocols/icmp_echo/pytest_icmp_echo.py

@@ -0,0 +1,36 @@
+# SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
+# SPDX-License-Identifier: Apache-2.0
+
+import os
+
+import pytest
+from common_test_methods import get_env_config
+from pytest_embedded import Dut
+
+
+@pytest.mark.esp32
+@pytest.mark.esp32c3
+@pytest.mark.esp32s2
+@pytest.mark.esp32s3
+@pytest.mark.wifi_nearby
+def test_protocols_icmp_echo(dut: Dut) -> None:
+    # get env config
+    env_config = get_env_config('wifi_nearby')
+    ap_ssid = env_config['ap_ssid']
+    ap_password = env_config['ap_password']
+    ap_channel = env_config.get('ap_channel', 0)
+
+    dut.expect('esp>')
+    dut.write(f'wifi_connect {ap_ssid} {ap_password} -n {ap_channel}')
+    dut.expect('Got IPv4 event:', timeout=30)
+
+    ping_dest = os.getenv('EXAMPLE_ICMP_SERVER', 'ci.espressif.cn')
+    dut.write('ping {} -c 5'.format(ping_dest))
+
+    # expect at least two packets (there could be lost packets)
+    ip = dut.expect(r'64 bytes from (\d+\.\d+\.\d+\.\d+) icmp_seq=\d ttl=\d+ time=\d+ ms')[1].decode()
+    dut.expect(fr'64 bytes from {ip} icmp_seq=[2-5] ttl=\d+ time=')
+
+    dut.expect(r'5 packets transmitted, [2-5] received, \d{1,3}% packet loss')
+    dut.write('')
+    dut.expect('esp>')