From 658e931aa6ada70a71c9fddb456380d43bb51ddf Mon Sep 17 00:00:00 2001
From: billz <billzimmerman@gmail.com>
Date: Fri, 18 Apr 2025 12:30:59 -0700
Subject: [PATCH] Initial commit

---
 installers/raspap-network-activity.sh | 53 +++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100755 installers/raspap-network-activity.sh

diff --git a/installers/raspap-network-activity.sh b/installers/raspap-network-activity.sh
new file mode 100755
index 00000000..ae42e1ee
--- /dev/null
+++ b/installers/raspap-network-activity.sh
@@ -0,0 +1,53 @@
+#!/bin/bash
+#
+# RaspAP network activity monitor
+# Reads from /proc/net/dev to get TX/RX byte counters for a given interface (wlan0 by default),
+# calculates the difference and writes to /dev/shm/net_activity.
+#
+# Author: @billz <billzimmerman@gmail.com>
+# Author URI: https://github.com/billz/
+# License: GNU General Public License v3.0
+# License URI: https://github.com/raspap/raspap-webgui/blob/master/LICENSE
+#
+# /usr/local/bin/raspap-network-activity.sh
+
+# Exit on error
+set -o errexit
+# Exit on error inside functions
+set -o errtrace
+# Turn on traces, disabled by default
+# set -o xtrace
+
+IFACE="${1:-wlan0}"              # default to wlan0 if not specified
+TMPFILE="/dev/shm/net_activity"  # tmpfs that resides in RAM 
+INTERVAL=0.05 # 50 ms
+
+# Initialize
+prev_rx=0
+prev_tx=0
+
+get_bytes() {
+  awk -v iface="$IFACE" '$1 ~ iface":" {
+    gsub(":", "", $1);
+    print $2, $10
+  }' /proc/net/dev
+}
+
+read rx tx < <(get_bytes)
+prev_rx=$rx
+prev_tx=$tx
+
+while true; do
+  sleep $INTERVAL
+  read rx tx < <(get_bytes)
+
+  rx_diff=$((rx - prev_rx))
+  tx_diff=$((tx - prev_tx))
+  total_diff=$((rx_diff + tx_diff))
+  echo "$total_diff"
+  echo "$total_diff" > "$TMPFILE"
+
+  prev_rx=$rx
+  prev_tx=$tx
+done
+