#!/bin/sh
rm -f /tmp/logread.txt

logread -f > /tmp/logread.txt &
LOGREAD_PID=$!

mmcli -m 0 --command="AT+CREG?" > /dev/null
kill -9 ${LOGREAD_PID}

ATRES=$(grep -Eo '\+CREG: [0-9],[0-9],"[0-9A-F]+","[0-9A-F]+"' /tmp/logread.txt)
rm -f /tmp/logread.txt

echo $ATRES | cut -d, -f4 | grep -Eo '[0-9A-F]+'