[FS#3499] [netifd] no way to monitor the real state of a connection via protocol handlers

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FS#3499 - [netifd] no way to monitor the real state of a connection via protocol handlers
User who did this - John (johnth)

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Hi,
Thank you for you work with ModemManager!
For a long time, I have used a USB NCM modem (without knowing of MM),
and have wanted a way for it to detect disconnect and automatically reconnect.

I do not know ModemManager, or ubus / netifd.

I do not know if it works, but it looks like at one stage, ppp used netifd for reconnects:
https://github.com/openwrt-mirror/openwrt/commit/3411334dd8d55107fe9dc1fcf018b28fcbbeb90b

Could we use MM's dbus state change to make a ubus call to netifd?
Even if it is an external daemon monitoring dbus?
https://www.freedesktop.org/software/ModemManager/api/latest/ModemManager-Flags-and-Enumerations.html#MMModemState

Example:
>From the ppp proto, the proto_run_command uses the ip-down-script /lib/netifd/ppp-down, which sends a message to netifd via ubus through the shell library.
https://github.com/openwrt/openwrt/blob/master/package/network/services/ppp/files/lib/netifd/ppp-down


ubus monitor
-> 97d0daf0 #97d0daf0          hello: {}
 97d0daf0 #00000000           data: {"objpath":"network.interface","objid":140326987,"objtype":-806725414,"signature":{"up":{},"down":{},"renew":{},"status":{},"prepare":{},"dump":{},"add_device":{"name":3,"link-ext":7,"vlan":1},"remove_device":{"name":3,"link-ext":7,"vlan":1},"notify_proto":{},"remove":{},"set_data":{}}}
-> 97d0daf0 #00000000         status: {"status":0}
 bacdf6e3 #97d0daf0         invoke: {"objid":140326987,"method":"notify_proto","data":{"action":0,"ifname":"ifname_example","link-up":false,"keep":false,"interface":"interface_example"},"user":"root","group":"root"}

. /lib/netifd/netifd-proto.sh
proto_init_update "ifname_example" 0
proto_send_update "interface_example"

echo "$(json_dump)"
{ "action": 0, "ifname": "ifname_example", "link-up": false, "keep": false, "interface": "interface_example" }
ubus call network.interface notify_proto "$(json_dump)"


Netifd shell functions:
/lib/netifd/netifd-proto.sh
https://git.openwrt.org/?p=project/netifd.git;a=blob;f=scripts/netifd-proto.sh

json shell functions:
/usr/share/libubox/jshn.sh
https://git.openwrt.org/?p=project/libubox.git;a=blob;f=sh/jshn.sh

If something like this //might// work, I can keep digging?

Cheers
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3499#comment9161

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