We are developing an application based on the nRF9151 using NCS 3.1.1 and modem firmware mfw_nrf91x1_2.0.3.
We would like to use Proprietary PSM to control the modem's sleep behavior when the network grants standard PSM settings that greatly differ from our requested TAU and Active Time values.
Our main question:
If the network supports standard PSM but grants different TAU and/or Active Time values than those requested by the device, is there a way to force the modem to use Proprietary PSM with our preferred settings instead of the network-granted settings?
In other words, can Proprietary PSM be explicitly selected or prioritized even when standard PSM is available, so that we can control the modem's sleep duration independently of the network's PSM configuration?
If this is possible, please clarify the required configuration or AT commands/API, and whether there are any limitations.