retrieve wireless status from OpenWRT then send to tsdb

wstat.lua

function main(cmd)                                                              
  local f = assert(io.popen(cmd, 'r'))                                          
  --local f = assert(io.open('a', 'r'))                                         
  local cur_station = ''                                                        
  local result = {}                                                             
                                                                                
  for line in f:lines() do                                                      
    fst_char = string.sub(line, 0, 1)                                           
                                                                                
    if fst_char == "S" then                                                     
      captured = string.match(line, "Station%s(%x%x:%x%x:%x%x:%x%x:%x%x:%x%x)") 
      if captured then cur_station = captured end                               
    else                                                                        
      key, value  = string.match(line, "%s+([%w ]+):%s+([%w.]+)")               
      if key then                                                               
        point = string.format("put wireless.%s %s %s mac=%s",                   
          string.gsub(key, "%s", '_'), os.time(), value, cur_station)           
        print(point)                                                            
      end                                                                       
    end                                                                         
  end                                                                           
end                                                                             
                                                                                
main('iw dev wlan0 station dump')