How to control the KNX bus via SMS and send notices via SMS?

[admin]

1. Modify the user library send function so it returns the command reply/result:

Code:

-- send command to terminal
function AT:send(cmd)
  local res, err = self.port:write(cmd .. '\r\n')
  local reply

  -- write ok, get local echo
  if res then
    res, err = self:readuntil(cmd)
    reply = self:read()
  end

  return res, err, reply
end

2. Add before handler = function(sms) in the resident script:

Code:

readcsq = function()
    local res, err, reply = modem:send('AT+CSQ')
    local rssi

    if reply then
      rssi = reply:match('%+CSQ:%s+(%d+),(%d+)')
    end

    rssi = tonumber(rssi) or 0

    if 2 <= rssi and rssi <= 9 then
      quality = 'marginal'
    elseif 10 <= rssi and rssi <= 14 then
      quality = 'ok'
    elseif 15 <= rssi and rssi <= 19 then
      quality = 'good'
    elseif 20 <= rssi and rssi <= 30 then
      quality = 'excellent'
    else
      quality = 'unknown'
    end
  end

  csqtime = os.time()

3. Add before udphandler(server) in the resident script:

Code:

now = os.time()
    delta = math.abs(now - csqtime)

    if delta >= 15 then
      csqtime = now
      readcsq()
    end

This will read the signal quality every 15 seconds and will set global variable quality that you can use in the SMS reply message.