LTE connection failure¶
Problem: The gateway cannot establish an LTE connection despite a correctly installed SIM and APN.
Cause: The modem needs to be recovered, or its automatic operator selection failed to connect to
your carrier.
Solution: Use the modem-tools helper to check the modem, retry the connection, and — if needed —
select your operator manually. This is a command-line procedure.
Recover the modem with modem-tools over SSH¶
Open an SSH session to the gateway. Run
senarch-help to list the available helper commands, including modem-tools. modem-tools talks to
the modem for you, so there is no need to toggle GPIO power lines or open a serial terminal by hand.
Start by checking the modem and retrying the normal connection.
Check the modem state:
Retry the normal connection path:
If it still fails, power-cycle the modem and rebuild the data path:
Run a bounded AT diagnostic sequence:
Force the operator manually¶
If your carrier is still not selected automatically, force the operator with the at passthrough.
Check the current operator:
Scan for operators:
Select your operator (replace 23801 with your operator's code from the scan results):
Verify:
Return to automatic selection:
Reboot the gateway and confirm LTE connectivity. The modem should connect automatically on future restarts.