local function wait_for_connection(timeout_ms)
  local start = tmr.now()
  local now
  local timeout = timeout_ms * 1000

  repeat
    local ip = wifi.sta.getip()

    print("ip="..tostring(ip))

    if ip then -- and ip ~= "0.0.0.0" then
      return ip
    end

    tmr.wdclr()
    now = tmr.now()
  until (now - start) > timeout
  return false
end

function wlan_init(ssid, password)
  print("WLAN: connecting to SSID:"..ssid..", password="..password)

  wifi.setmode(wifi.STATION)
  wifi.sta.config(ssid, password)

  local ip = wait_for_connection(10 * 1000)
  if not ip then
    panic("Could not establish wlan connection, restarting")
  end

  print("WLAN: Configured, ip="..ip)
end