Here's a handy python script do the job of uwsgi --ping <address>

  #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  from __future__ import unicode_literals, print_function

  import socket
  import struct

  #---------------------------------------------------------------
  #---------------------------------------------------------------
  def ping_uwsgi(sock_file):
      '''
      Ping UWSGI process trought socket. Return [True,...] if OK,
      return [False,error] if UWSGO not pinging, or
      [None,error] if common error (ex. socket file not found)
      '''
      rv = [None,'']
      fmt_h = str('<BHB')
      sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
      try:
          sock.connect(sock_file)
      except socket.error,e:
          rv = [None,e]
      sock = None
      if (sock):
          ping = struct.pack(fmt_h,100,0,0)
          sock.send(ping)
          pong = sock.recv(struct.calcsize(fmt_h))
          sock.close()
          p = struct.unpack(fmt_h,pong)
      if (p == (100,0,1)):
          rv = [True, 'OK']
      else:
          rv = [False, 'ERR']
      return rv
  #---------------------------------------------------------------
  #---------------------------------------------------------------

via http://pypi.python.org/pypi/nust