Ohad,
I would be interested in hearing the outcome of your Raspberry Pi connectivity experiment.
Also, if it’s ok can you mention the name of the 3rd party carrier please.
We are using the Nova and Hologram to soon operate over 500 IOT devices
which are used for advertising.
Just rolling out the first dozen units yesterday.
We use only the ssh tunnel to log into the PI-zero unix OS if needed.
The units call “home” to see if content update is required and use wget for downloading. Other operations use ftp but that’s about it.
SSH, wget and ftp along with cron of course - basic unix stuff.
We limit the calls home to save on airtime to twice per day, but the nova stays connected at all times.
We may look into a less expensive alternative for future builds hence the question about your inexpensive 3rd party carrier.
TIA
Rich