Read with Wait function

[admin]

Use this function:

Code:

function readresponse(alias, timeout)
  local obj, lb, ts, tu, delta, value
  obj = grp.find(alias)

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

  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)
    end
  end)

  grp.read(obj.address)
  ts, tu = os.microtime()

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

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

res, err = readresponse('0/0/3')
log(res, err)