Checks for MQTT subbed-topic in Termux or linux and sends push notifications on receiving a message

notify-mqtt.sh

#!/usr/bin/env bash
IP="10.0.0.1" #Change to IP of server
TOPIC="torrent/finished" # Change to your liking
VERSION="mqttv5"
if [ -n "$(command -v mosquitto_sub)" ]; then
	echo "Found mosquitto"
	if [ "$( uname )" == "Linux" ]; then
		if [ -n "$( command -v termux-notification )" ]; then
			echo "Running in termux"
			mosquitto_sub -h "$IP" -V "$VERSION" -t "$TOPIC" | while read OUTPUT; do termux-notification -c "$OUTPUT"; done
		elif [ -n "$( command -v notify-send )" ]; then
			echo "Using notify-send"
			mosquitto_sub -h "$IP" -V "$VERSION" -t "$TOPIC" | while read OUTPUT; do notify-send "$TOPIC" "$OUTPUT"; done
		else
			echo "Install a compatible notification service."	
		fi
	else 
		echo "You must run a compatible OS"
	fi
else
	echo "Mosquitto not found"	
fi