Hmmm, interesting - looks like my ERS sensors (ERSgrid / ERSeye) also don’t accept config changes over LoRaWAN.
I tried to reconfigure the SplPer and SendPer with a downlink message to port 6 (including a reboot command, payload created with Elsys downlink generator) but no reboot seen and sensor stays at the old sample & transmit periods.
Last test was against a sensor running firmware 2.2.7. I also tried a confirmed downlink; after that one, the sensor was lost completely, so I’ll have to go out and try to fix it on-site.