Support 4G/5G automatic reconnection using ModemManager

Lynx · March 7, 2024, 5:03pm

Well OK, but this is just pinging and polling:

4IceG/luci-app-lite-watchdog/blob/c33c215e826744287b7aed66b472b707c1521c73/luci-app-lite-watchdog/root/usr/bin/lite_watchdog.sh#L40


      
          if [[ "$LINES_COUNT" -ge "$LINES_MAX" ]]; then
          	echo "$(tail -$LINES_MIN $LOG_FILE)" > $LOG_FILE
          fi
          
          if [ ! -f "$CNT_FILE" ]; then
          	echo -n "" > /tmp/lite_watchdog_cnt
          	echo 0 >> /tmp/lite_watchdog_cnt
          fi
          
          date +"%Y-%m-%d %T" 2>&1 > /tmp/lite_watchdog_tt
          ping -q -4 -w 10 -c $2 $3 > /tmp/lite_watchdog 2>/dev/null
          
          PR=$(awk '/packets received/ {print $4}' /tmp/lite_watchdog)
          [ -z "$PR" ] && PR=0
          if [ "$PR" = "0" ]; then
          
          	echo 0 >> /tmp/lite_watchdog_cnt
          
          	TSTC=$(wc -l < /tmp/lite_watchdog_cnt)
          	TST=$((TSTC-1))

ModemManager already facilitates intercepting and reporting of disconnection events from the modem.

This pull request seems worth considering and critiquing:

github.com/openwrt/packages

modemmanager: reconnect interface if the modemmanager detects a disconnect

openwrt:master ← TDT-AG:pr/20240305-modemmanager

opened 02:47PM - 05 Mar 24 UTC

feckert

+4 -4

Maintainer: me / @aleksander0m Compile tested: not needed only script changes … Run tested: x86_64, APU3 Description: There are situation for mobile routers, that the ModemManager can not stay connected to the mobile network in OpenWrt. There can have various reasons. In order for the system to reconnect automatically, the netifd must be informed that it must re-establish the connection. The modem manager already does have a script callback handling which is already used by the modemmanager in openwrt. Currently the modem is marked as not unavailable when a disconnected event is detected. The behavior was changed with this commit, so that a reconnect of the interface is now triggerd via the netifd if the modem disconnects. Testcases: * Start a connection via netifd modemmanager proto * Execute the command `mmcli -m 0 --simple-disconnect` * With this change the netifd should start a reconnection * After the reconnection execute `ifdown wwan` * The interface does not reconnect Therefor, all use case should be covered. A ModemManager disconnect starts a reconnection via netifd A User disconnect does not start a reconnection.