Allow interface selection on NetworkMonitorMode (#1108)

When running armbianmonitor -N/n and two or more routable network interfaces are detected create a dynamic dialog box to select which interface should be monitored. Otherwise proceed as usual. Also reverts #1106

packages/bsp/common/usr/bin/armbianmonitor

@@ -1025,14 +1025,32 @@ VerifyInstallation() {
 } # VerifyInstallation
 
 NetworkMonitorMode() {
-	
+
 	# Allow armbianmonitor to return back to armbian-config
 	trap "echo ; exit 0" 0 1 2 3 15
 	timerStart
 	kickAllStatsDown
-	iface=$(route -n | egrep UG | egrep -o "[a-zA-Z0-9]*$" | head -n 1)
+
+	# Count interfaces - multiple routes causing interfaces to show up more than once, filtering...
+	ifacecount=$(route -n | egrep UG | egrep -o "[a-zA-Z0-9]*$" | sort | uniq)
+	# If there are two ore more interfaces detected open a dynamic dialog box to select which to monitor
+	if [ "$(echo -e $ifacecount | tr ' ' '\n' | wc -l)" -gt 1 ]; then
+		ifacemenu=$(route -n | egrep UG | egrep -o "[a-zA-Z0-9]*$" | sort | uniq | awk '{a[$1]=$1}END{for(i in a)printf i" "a[i]" "}')
+		ifacefunc() {
+			dialog --backtitle "Interface selector" \
+			--title "Multiple network interfaces detected" \
+			--menu "Choose which interface to monitor:" \
+			15 50 $(route -n | egrep UG | egrep -o "[a-zA-Z0-9]*$" | sort | uniq | wc -l) \
+			$(echo $ifacemenu) 2>&1 >$(tty)
+		}
+		iface=$(ifacefunc)
+	else
+	# Use default behavior if one interface is found only
+		iface=$(route -n | egrep UG | egrep -o "[a-zA-Z0-9]*$")
+	fi
 
 	printf "\nruntime network statistics: $(uname -n)\n"
+	printf "network interface: $(echo $iface)\n"
 	printf "[tap 'd' to display column headings]\n"
 	printf "[tap 'z' to reset counters]\n"
 	printf "[use <ctrl-c> to exit]\n"