I'm using the QMI protocol on an old ZTE MF283+ modem and the connection itself is fine:
root@OpenWrt:~# uqmi -d /dev/cdc-wdm0 --get-signal-info
{
"type": "lte",
"rssi": -70,
"rsrq": -8,
"rsrp": -99,
"snr": 20.200000
}
root@OpenWrt:~# qmicli -d /dev/cdc-wdm0 --nas-get-serving-system
[/dev/cdc-wdm0] Successfully got serving system:
Registration state: 'registered'
CS: 'attached'
PS: 'attached'
Selected network: '3gpp'
Radio interfaces: '1'
[0]: 'lte'
Roaming status: 'off'
Data service capabilities: '1'
[0]: 'lte'
Current PLMN:
MCC: '232'
MNC: '3'
Description: 'Magenta-T-'
Roaming indicators: '1'
[0]: 'off' (lte)
3GPP location area code: '65534'
3GPP cell ID: '***'
Detailed status:
Status: 'available'
Capability: 'cs-ps'
HDR Status: 'power-save'
HDR Hybrid: 'yes'
Forbidden: 'no'
LTE tracking area code: '14020'
Full operator code info:
MCC: '232'
MNC: '3'
MNC with PCS digit: 'no'
root@OpenWrt:~# qmicli -d /dev/cdc-wdm0 --nas-get-system-info
[/dev/cdc-wdm0] Successfully got system info:
GSM service:
Status: 'none'
True Status: 'none'
Preferred data path: 'no'
WCDMA service:
Status: 'none'
True Status: 'none'
Preferred data path: 'no'
LTE service:
Status: 'available'
True Status: 'available'
Preferred data path: 'no'
Domain: 'cs-ps'
Service capability: 'cs-ps'
Roaming status: 'off'
Forbidden: 'no'
Cell ID: '***'
MCC: '232'
MNC: '03'
Tracking Area Code: '14020'
Voice support: 'yes'
IMS voice support: 'no'
eMBMS coverage info support: 'no'
eMBMS coverage info trace ID: '65535'
Cell access: 'all-calls'
Registration restriction: 'unrestricted'
Registration domain: 'not-applicable'
TD-SCDMA service:
Status: 'none'
True Status: 'none'
Preferred data path: 'no'
SIM reject info: 'available'
Carrier aggregation is not available (but it should, isn't it?):
root@OpenWrt:~# qmicli -d /dev/cdc-wdm0 -p --nas-get-lte-cphy-ca-info
error: couldn't get carrier aggregation info: QMI protocol error (71): 'InvalidQmiCommand'
But always when I do a speed test the maximum is 13 MBit althouth the modem and my LTE rate supports up to 100 MBit. For comparison I have tried another modem with the Magenta stock OS on it and I got 80-100 MBit.
Is the MTU setting of 1500 an issue or what could I try to improve the speed?
Thank you