I managed to get the plugin and modemmanager running, however it doesn't add the ipv4 address to my wwan0 device. I managed to find it using mmcli -b 0 and if i add it manually to the device it works, however it is not added by default.
I tryied to debug the code in mm-bearer-xmm7360.c, and i found that self->priv->ip_config actually contains the address, nonetheless it is not addedd to the wwan device.