Added easytether helper script.

easytether/README.md

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+A script to automatically bring up/restart eastether'd USB phone. 
+
+It was written specifically for the GL.Net AR750S-EXT router, but is generic enough to work elsewhere. 
+
+Requires easytether to already be setup on the device.

easytether/fixnet.sh

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+#!/bin/sh
+
+# Version
+version=0.05
+
+# A simple script that checks for connectivity (including working DNS resolution)
+# If no connectivity, reset tethering
+# 
+# Requires easytether-usb to be installed and already setup/working
+# Manual (one time) setting of the USB device ID of the tether device (TETHERDEV).
+
+# Find the tethering device with lsusb. Example (Samsung/Verizon kids tablet):
+# Bus 001 Device 013: ID 04e8:6860 Samsung Electronics Co., Ltd Galaxy (MTP)
+TETHERDEV=04e8:6860
+# 04e8:6860 is for Samsung's USB identification (both Note 10 and kids tablet) 
+
+# Some highly available website to check (www.google.com is backed by *lots* of servers)
+CHECKWWW=www.google.com
+
+# How long before we check again?
+SLEEPITOFF=60
+
+while true; do
+	lsusb | grep $TETHERDEV > /dev/null  
+	if (( $? )); then
+		echo "Tethering device not found! Sleeping..."
+		sleep 5s
+	else
+		echo "Tethering device present, continuing"
+		break
+	fi
+done
+
+while true; do
+	curl --connect-timeout 10 $CHECKWWW > /dev/null 2>&1
+
+	if [ $? != 0 ]; then
+		# No internet
+		echo "Network down, Houston we have a problem!" # FIXME: For debugging
+		# Reset the USB device
+		usbreset $TETHERDEV 
+		# Wait a few seconds for device to be ready again
+		sleep 5s
+		# (re)start easytether-usb to make a connection
+		easytether-usb 
+	else
+		# Internet working
+		echo "Network up, all good in the hood!" # FIXME: For debugging
+	fi
+	sleep $SLEEPITOFF
+done
+