We have 2 Digi XBee3® Cellular LTE-M/NB-IoT module.
They are work fine in before.
But in suddenly, they cannot join the network.
PH, S#, IM, MN, MV, DB registers always are empty.
Then We change to use bypass mode and u-blox m-center.
There are no any return from Initialization and Get info.
Do you have any idea what happen?