problem with 4g modem

[admin]

Change the same function as follows and see if it helps.

Code:

function AT:run()
  local res, err, cmd, pos, sms

  res, err = self:read()
  if err then
    return err == 'timeout'
  end

  -- check for incoming command
  if res:sub(1, 1) ~= '+' then
    return true
  end

  pos = res:find(':', 1, true)

  if not pos then
    return true
  end

  -- get command type
  cmd = res:sub(2, pos - 1)

  -- check only for incoming sms
  if cmd == 'CMTI' then
    -- read from sim
    sms = self:incsms(res)

    -- sms seems to be valid, pass to handler if specified
    if sms and self.smshandler then
      self.smshandler(sms)
    end
  end

  return true
end