Hi. I am using several RBM33G boards with on-board LTE modems that periodically upload log files. I have a problem when the boards get switched off whilst mid-way through an upload (incomplete uploads of files), so I would like to add some kind of mini UPS that will initiate the upload on power loss, then shut down the board on battery. The Mikrotik UPS system uses a voltage monitor to detect power loss, but unfortunately the RBM33G boards do not have a voltage sensor, so I’m wondering if there is another way to do this. Are there any GPIO pins? I can’t find any info on that.
Thanks,
Alan