thank you very much for your reply.
Yes off course you are right, it's better to use the Serial0 instead the Serial line,I already tested this way in order to undersood this behaviour but now I will try again and I will give you a feedback.
Yes it's a battery powered device with an energy harvestnig systemIn such case you could make a while loop (delay while data is not ready - with timeout) and read then the value - but this can take of course some time and battery (I think it will be a battery FLiRS device...).
Ok no problem for this: in the final device, I will acquire the measures at least every 1 hour so the device will have the last measure acquired in the memory (i hope!!!)In datasheet:
"Mode 3: Low power pulse heating mode IAQ measurement every 60 seconds" - so there should be every 60 seconds a new value available.
I will give the feedback also for fixed values as you suggested to me.
Thanks a lot,
Michele