## ping.lua

    #! /usr/bin/env lua

    local M = require 'posix.sys.socket'

    if M.SOCK_RAW and M.SO_BINDTODEVICE then
       -- Open raw socket

       local fd, err = M.socket(M.AF_INET, M.SOCK_RAW, M.IPPROTO_ICMP)
       assert(fd, err)

       -- Optionally, bind to specific device

       local ok, err = M.setsockopt(fd, M.SOL_SOCKET, M.SO_BINDTODEVICE, 'wlan0')
       assert(ok, err)

       -- Create raw ICMP echo (ping) message

       local data = string.char(0x08, 0x00, 0x89, 0x98, 0x6e, 0x63, 0x00, 0x04, 0x00)

       -- Send message

       local ok, err = M.sendto(fd, data, {family=M.AF_INET, addr='8.8.8.8', port=0})
       assert(ok, err)

       -- Read reply

       local data, sa = M.recvfrom(fd, 1024)
       assert(data, sa)

       if data then
          print('Received ICMP message from ' .. sa.addr)
       end
    end

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