ModemMananger "Unsupported protocol type"

I want to try this module for my Sierra Wireless 7455 LTE modem so I read this tutorial. Installed all modules and this is the network config:

config interface 'broadband'
    option device '/sys/devices/platform/101c0000.ehci/usb1/1-1/1-1.3'
    option proto    'modemmanager'
    option apn      ''

All seems ok but this what the new interface sais:

Anybody use ModemManager and know if my config is right?

I built the master but now I have problems with Dbus:

dbus[5139]: Failed to start message bus: Failed to open "/dbus-1/system.conf": No such file or directory

So I removed and reinstalled it and this is the error:

root@OpenWrt:~# mmcli -L
error: couldn't get bus: Could not connect: No such file or directory

What is this?

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