I am working on a remote wildlife monitoring system deployed in Somaliland. The system uses a NVIDIA Jetson Nano connected to a SIM7600G-H LTE modem via USB (/dev/ttyUSB2). Every 60 seconds, the application sends a JSON payload to a remote server using HTTP POST over the cellular network.
The system operates normally for about three days, after which the modem stops transmitting data. The Jetson Nano continues running, but no further data reaches the server. The problem persists until someone physically restarts the system, after which the modem resumes normal operation for another few days.
The deployment is powered by a solar panel with battery backup, and both the Jetson and modem are installed inside a sealed outdoor enclosure exposed to high ambient temperatures.
My question is:
What diagnostics would you recommend to determine why a SIM7600G-H that operates normally for several days eventually stops transmitting until the system is restarted?
To help narrow the problem:
- The modem is connected via USB.
- The application communicates with the modem using AT commands.
- The modem is used only for cellular communication; it does not store application data.
- The application itself continues running after communication stops.
- Restarting the system immediately restores normal operation.
I am particularly interested in practical ways to determine whether the failure is caused by:
- Loss of network registration
- USB communication failure between the Jetson and the modem
- Power instability during LTE transmission
- Thermal shutdown or modem firmware lock-up
If anyone has encountered similar long-term failures with the SIM7600G-H, I'd appreciate hearing what diagnostics helped identify the root cause and what the eventual solution was.