old_contents: from __future__ import unicode_literals
  import re
  import ttfw_idf
  
  
  @ttfw_idf.idf_example_test(env_tag='Example_WIFI')
  def test_examples_icmp_echo(env, extra_data):
  
      dut = env.get_dut('icmp_echo', 'examples/protocols/icmp_echo')
      dut.start_app()
  
      dut.expect('example_connect: Connected to')
      dut.expect('esp>')
      dut.write('ping www.espressif.com')
      ip_re = r'\.'.join((r'\d{1,3}',) * 4)
      ip = dut.expect(re.compile(r'64 bytes from ({}) icmp_seq=1 ttl=\d+ time=\d+ ms'.format(ip_re)))[0]
  
      # expect at least one more (there could be lost packets)
      dut.expect(re.compile(r'64 bytes from {} icmp_seq=[2-5] ttl=\d+ time='.format(ip)))
  
      dut.expect(re.compile(r'5 packets transmitted, [2-5] received, \d{1,3}% packet loss'))
      dut.write('')
      dut.expect('esp>')
  
  
  if __name__ == '__main__':
      test_examples_icmp_echo()
  
new_contents: from __future__ import unicode_literals
  import re
  import ttfw_idf
  import os
  
  
  @ttfw_idf.idf_example_test(env_tag='Example_WIFI')
  def test_examples_icmp_echo(env, extra_data):
  
      dut = env.get_dut('icmp_echo', 'examples/protocols/icmp_echo')
      dut.start_app()
  
      dut.expect('example_connect: Connected to')
      dut.expect('esp>')
  
      ping_dest = os.getenv('EXAMPLE_ICMP_SERVER', 'www.espressif.com')
      dut.write('ping {}'.format(ping_dest))
  
      ip_re = r'\.'.join((r'\d{1,3}',) * 4)
      ip = dut.expect(re.compile(r'64 bytes from ({}) icmp_seq=1 ttl=\d+ time=\d+ ms'.format(ip_re)))[0]
  
      # expect at least one more (there could be lost packets)
      dut.expect(re.compile(r'64 bytes from {} icmp_seq=[2-5] ttl=\d+ time='.format(ip)))
  
      dut.expect(re.compile(r'5 packets transmitted, [2-5] received, \d{1,3}% packet loss'))
      dut.write('')
      dut.expect('esp>')
  
  
  if __name__ == '__main__':
      test_examples_icmp_echo()
  
subject: change icmp example test address