examples: Added non blocking sockets example tests

Closes https://github.com/espressif/esp-idf/issues/6675

examples/protocols/sockets_non_blocking/tcp_server/example_test.py

@@ -0,0 +1,89 @@
+# This example code is in the Public Domain (or CC0 licensed, at your option.)
+
+# Unless required by applicable law or agreed to in writing, this
+# software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+# CONDITIONS OF ANY KIND, either express or implied.
+
+# -*- coding: utf-8 -*-
+
+from __future__ import print_function, unicode_literals
+
+import os
+import re
+import socket
+import sys
+
+import ttfw_idf
+
+# -----------  Config  ----------
+PORT = 3344
+INTERFACE = 'eth0'
+# -------------------------------
+
+
+def tcp_client(address, payload):
+    for res in socket.getaddrinfo(address, PORT, socket.AF_UNSPEC,
+                                  socket.SOCK_STREAM, 0, socket.AI_PASSIVE):
+        family_addr, socktype, proto, canonname, addr = res
+    try:
+        sock = socket.socket(family_addr, socket.SOCK_STREAM)
+        sock.settimeout(60.0)
+    except socket.error as msg:
+        print('Could not create socket: ' + msg)
+        raise
+    try:
+        sock.connect(addr)
+    except socket.error as msg:
+        print('Could not open socket: ', msg)
+        sock.close()
+        raise
+    sock.sendall(payload.encode())
+    data = sock.recv(1024)
+    if not data:
+        return ''
+    print('Reply : ' + data.decode())
+    sock.close()
+    return data.decode()
+
+
+@ttfw_idf.idf_example_test(env_tag='Example_WIFI')
+def test_examples_protocol_socket_tcpserver(env, extra_data):
+    """
+    steps:
+      1. join AP
+      2. have the board connect to the server
+      3. send and receive data
+    """
+    msg = 'Data to ESP'
+    dut1 = env.get_dut('tcp_client', 'examples/protocols/sockets_non_blocking/tcp_server', dut_class=ttfw_idf.ESP32DUT)
+    # check and log bin size
+    binary_file = os.path.join(dut1.app.binary_path, 'tcp_server.bin')
+    bin_size = os.path.getsize(binary_file)
+    ttfw_idf.log_performance('tcp_server_bin_size', '{}KB'.format(bin_size // 1024))
+
+    # start test
+    dut1.start_app()
+    ipv4 = dut1.expect(re.compile(r' IPv4 address: ([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)'), timeout=30)[0]
+    ipv6_r = r':'.join((r'[0-9a-fA-F]{4}',) * 8)    # expect all 8 octets from IPv6 (assumes it's printed in the long form)
+    ipv6 = dut1.expect(re.compile(r' IPv6 address: ({})'.format(ipv6_r)), timeout=30)[0]
+    print('Connected with IPv4={} and IPv6={}'.format(ipv4, ipv6))
+
+    # test IPv4
+    received = tcp_client(ipv4, msg)
+    if received != msg:
+        raise
+    dut1.expect(msg)
+
+    # test IPv6
+    received = tcp_client('{}%{}'.format(ipv6, INTERFACE), msg)
+    if received != msg:
+        raise
+    dut1.expect(msg)
+
+
+if __name__ == '__main__':
+    if sys.argv[2:]:    # if two arguments provided:
+        # Usage: example_test.py <server_address> <message_to_send_to_server>
+        tcp_client(sys.argv[1], sys.argv[2])
+    else:               # otherwise run standard example test as in the CI
+        test_examples_protocol_socket_tcpserver()