Hello,
we are trying to use the nRF9160 as a serial modem for a Raspberry Pi running on Debian.
The application is basically the nRF sample "nrf\samples\cellular\modem_shell" without major changes (compiled without CMUX as described for Linux target systems),
modem firmware is v1.3.6, board is nrf9160dk_nrf9160_ns.
We are using the PPP channel only (without a second UART), the application is configured for 'autostart' and no additional commands (including AT) are sent from the Raspberry Pi.
This is working in principle, but we are facing problems with long term stability, the main application is running for a while but after a few hours the connection may get lost.
1. Is the application even tested for longer runtime or just for e.g. single data transmissions?
2. Should this basically be working as we are trying it now or is a more complex control (e.g. restart routine) via AT command channel required in the concept ?
Also we had the problem that the application is not starting up with RTT logging, only after RTT Viewer was connected. (?)
We therefore for now had to configure the logging to a non existing UART channel (pins are floating), which is why I don't have any logs of the events.
Thank you!
Best regards,
Bernhard