I am trying to calculate the “worst case” regarding EU868 1% Duty Cycle. Meaning: How often can I send a maximum sized payload (51 Bytes) at SF12. I use the Airtime Calculator.
One open question remains: I can select the coding rate which, of course, changes the time on air. Its quite hard to find information about the coding rate other than that 4/5 is the default for LoRaWAN.
Here comes my question: Is the coding rate ever changed, e.g. if the LNS finds a signal to be weak and frequently lost?
Depending on the coding rate, my results vary from 04:07 minutes to 05:55 minutes.
Thanks & best regards