Support 4G/5G automatic reconnection using ModemManager

There seems to be some logic to this in my mind.

Any idea how this should change for that:

root@OpenWrt:~# cat /usr/lib/ModemManager/connection.d/10-report-down-and-reconnect
#!/bin/sh

# Automatically report to netifd that the underlying modem
# is really disconnected and reconnect if interface was up

# require program name and at least 4 arguments
[ $# -lt 4 ] && exit 1

MODEM_PATH="$1"
BEARER_PATH="$2"
INTERFACE="$3"
STATE="$4"

[ "${STATE}" = "disconnected" ] || exit 0

. /usr/share/ModemManager/modemmanager.common
. /lib/netifd/netifd-proto.sh
INCLUDE_ONLY=1 . /lib/netifd/proto/modemmanager.sh

MODEM_STATUS=$(mmcli --modem="${MODEM_PATH}" --output-keyvalue)
[ -n "${MODEM_STATUS}" ] || exit 1

MODEM_DEVICE=$(modemmanager_get_field "${MODEM_STATUS}" "modem.generic.device")
[ -n "${MODEM_DEVICE}" ] || exit 2

CFG=$(mm_get_modem_config "${MODEM_DEVICE}")
[ -n "${CFG}" ] || exit 3

IFUP=$(ifstatus ${CFG} | jsonfilter -e '@.up')

logger -t "modemmanager" "interface ${CFG} (network device ${INTERFACE}) ${STATE}"
proto_init_update $INTERFACE 0
proto_send_update $CFG

[ "${IFUP}" = "true" ] && ifup ${CFG}

exit 0
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