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Read with Wait function
I'm looking for a function which sends read request to KNX bus and waits for the result. The reason is I have two inputs which I need to be sure their values are actual.
This works but it's ugly because I don't check if the readings of both values were successful:'6/4/28')'6/4/45')


Is there such
LM5Lp, firmware: 2018.08.22, FlashSYS v2, ARMv7 Processor rev 5 (v7l), kernel 4.4.151
Use this function:
function readresponse(alias, timeout)
  local obj, lb, ts, tu, delta, value
  obj = grp.find(alias)

  if not obj then
    return nil, 'object not found'

  timeout = timeout or 3

  lb = require('localbus').new(timeout / 10)
  lb:sethandler('groupresponse', function(event)
    if event.dst == obj.address then
      value = busdatatype.decode(event.datahex, obj.datatype)
  ts, tu = os.microtime()

    delta = os.udifftime(ts, tu)
  until value ~= nil or delta >= timeout

  if value ~= nil then
    return value
    return nil, 'timeout'

res, err = readresponse('0/0/3')
log(res, err)
Excellent as usual Admin. Thank you.
But does lb:step() do yield? Isn't the cycle utilising the CPU to 100%?
LM5Lp, firmware: 2018.08.22, FlashSYS v2, ARMv7 Processor rev 5 (v7l), kernel 4.4.151
It returns once a single local bus message has been received or timeout happens. Script does not consume CPU while waiting.
Is it possible for the timeout to re-trigger and over ride the last timeout every time the function i called? i am having a few instances running at the same time
Do you mean that you want to send several read requests at once and then return once all responses are received or timeout happens?

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