Communicating With The Cellular Modem
Interfacing with the cellular modem is only available via CLI.
Usage: mmcli [OPTION?] - Control and monitor the ModemManager
Options:
| -h, --help | Show help options |
| --help-all | Show all help options |
| --help-manager | Show manager options |
| --help-common | Show common options |
| --help-modem | Show modem options |
| --help-3gpp | Show 3GPP related options |
| --help-cdma | Show CDMA related options |
| --help-simple | Show Simple options |
| --help-location | Show Location options |
| --help-messaging | Show Messaging options |
| --help-voice | Show Voice options |
| --help-time | Show Time options |
| --help-firmware | Show Firmware options |
| --help-signal | Show Signal options |
| --help-oma | Show OMA options |
| --help-sim | Show SIM options |
| --help-bearer | Show bearer options |
| --help-sms | Show SMS options |
| --help-call | Show call options |
Application Options:
-v, --verbose Run action with verbose logs
-V, --version Print version
-a, --async Use asynchronous methods
--timeout=[SECONDS] Timeout for the operation
5G Settings and behavior
Standalone versus non-standalone operation
The 10G-5G modules can connect in either standalone (SA) or non-standalone (NSA) mode.
5G-NSA employs a simultaneous 5GNR and LTE core connection. Data transfer occurs over 5G, while control aspects of the network use 4G technology. Depending on the carrier, the 5G connection may go dormant when inactive, activating either when data transfer begins or after a certain data transfer threshold.
To show which network the module is connected to, use the AT!COPS? command, which returns the following:
+COPS: [selection mode],[operator format],[operator],[access technology]
Example:
root@cm8196-10g-5g-tp2-p29:~# mmcli -m a --command='AT+COPS?'
response: '+COPS: 0,0,"Telstra",13'
This example shows access technology 13 (5G-NSA), which corresponds to the following table.
| 2 (UTRAN) | 3G |
| 7 (E-UTRAN) | 4G |
|
11 (NR connected to a 5GCN) |
5G SA |
| 13 (E-UTRA-NR dual connectivity) | 5G NSA |
Determining 5G status
Determining the 5G status requires two commands:
-
AT+COPS? : First, use this command to see if there is a 5G-NSA connection (see above).
-
AT!GSTATUS? : Then, run this command and check if system_mode is LTE (to indicate that 5G is dormant) or ENDC (to indicate that 5G is active).
Forcing a 5G or LTE connection
To force a 5G or LTE connection, use the “nas-set-system-selection-preference” and “AT!RATCONFIG” commands.
Force 5G-SA
qmicli -p -d /dev/wwan0qmi0 --nas-set-system-selection-preference="5gnr",automatic
Disable 5G-NSA
AT!RATCONFIG="NR",2
qmicli -p -d /dev/wwan0qmi0 --nas-set-system-selection-preference="lte|5gnr",automatic
Force 5G-NSA
AT!RATCONFIG="NR",1
qmicli -p -d /dev/wwan0qmi0 --nas-set-system-selection-preference="lte|5gnr",automatic
Force LTE
qmicli -p -d /dev/wwan0qmi0 --nas-set-system-selection-preference="lte",automatic