From 4f9aef4bc5e0a0526b2d9c640ce9036b0dd9788b Mon Sep 17 00:00:00 2001
From: Ronald Farrer <canutethegreat@gmail.com>
Date: Wed, 29 Jan 2020 10:31:39 -0800
Subject: [PATCH] Added easytether helper script.

---
 easytether/README.md |  5 +++++
 easytether/fixnet.sh | 52 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 57 insertions(+)
 create mode 100644 easytether/README.md
 create mode 100755 easytether/fixnet.sh

diff --git a/easytether/README.md b/easytether/README.md
new file mode 100644
index 0000000..d1fdd45
--- /dev/null
+++ b/easytether/README.md
@@ -0,0 +1,5 @@
+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.
diff --git a/easytether/fixnet.sh b/easytether/fixnet.sh
new file mode 100755
index 0000000..41ff07d
--- /dev/null
+++ b/easytether/fixnet.sh
@@ -0,0 +1,52 @@
+#!/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
+