Hi! I’m using 5G modem RG255C-GL. I have added the changes in Linux drivers and the modem is visible as a USB device. However, I have trouble in finding the 5G or 4G networks.
- 5G modem detected as USB device after plugging in to M.2 slot
- patched USB option Linux kernel driver so the virtual serial ports are exposed over USB
- added qmi_wwan_q driver net Linux kernel driver
- ModemManager picking up the modem
- able to reach SIM using modem’s interface
- SIM activated
- can’t register to any cellular network
mmcli -m a
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General | path: /org/freedesktop/ModemManager1/Modem/0
| device id: 7e62xxxx
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Hardware | manufacturer: Quectel
| model: RG255C-GL
| firmware revision: RG255CGLABR01A04M4G
| supported: gsm-umts
| current: gsm-umts
| equipment id: 86462406004XXXX
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System | device: /sys/devices/platform/3610000.xhci/usb1/1-2
| drivers: option
| plugin: quectel
| primary port: ttyUSB2
| ports: ttyUSB2 (at)
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Status | unlock retries: sim-pin (3), sim-puk (10), sim-pin2 (3), sim-puk2 (10)
| state: disabled
| power state: on
| signal quality: 0% (cached)
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Modes | supported: allowed: any; preferred: none
| current: allowed: any; preferred: none
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IP | supported: ipv4, ipv6, ipv4v6
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3GPP | imei: 86462406004XXXX
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3GPP EPS | ue mode of operation: ps-2
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SIM | primary sim path: /org/freedesktop/ModemManager1/SIM/0
mmcli -m 0 --command='AT+C5GREG=1'
response: ''
mmcli -m 0 --command='AT+CEREG=1'
response: ''
mmcli -m 0 --command='AT+CGDCONT=?'
response: '+CGDCONT: (1-16),"IP",,,(0-3),(0-4),(0-1),(0-1),,,,,,,,,(0-1),,(0-1),,,(0-1)
+CGDCONT: (1-16),"IPV6",,,(0-3),(0-4),(0-1),(0-1),,,,,,,,,(0-1),,(0-1),,,(0-1)
+CGDCONT: (1-16),"IPV4V6",,,(0-3),(0-4),(0-1),(0-1),,,,,,,,,(0-1),,(0-1),,,(0-1)'
mmcli -m 0 --command='AT+COPS=?'
error: command failed: 'GDBus.Error:org.freedesktop.ModemManager1.Error.Serial.ResponseTimeout: Serial command timed out'
How to register to 5G network and connect?