btconn

#!/bin/bash

###
# (Auto)connect to a bluetooth device.
# Needs 'FastConnectable=true' in /etc/bluetooth/main.conf
# This program comes with absolutely no warranty.
# Author: Çağlar Turalı <turali.js.org>
##

if ! [ -x "$(command -v bluetoothctl)" ]; then
	printf "bluetoothctl is not found. Aborting.\n" >&2
	exit 1
fi

if [ "$#" -eq 0 ]; then
	printf "Provide the MAC address of your device.\n" >&2
	exit 1
fi

BT_MAC="$1"
WAIT_FOR=3

btinfo() {
	if [[ $(bluetoothctl info "$BT_MAC" | grep -i "$1") == *"yes"* ]]; then
		return 0
	else
		return 1
	fi
}

while ! btinfo "connected"; do
	ops=(
		'connect'
	)
	# Make sure the device is paired and trusted.
	if ! (btinfo "paired" && btinfo "trusted"); then
		ops=('pair' 'trust' "${ops[@]}")
	fi

	for op in "${ops[@]}"; do
		printf "==> Performing the operation '%s' with the bluetooth device '%s'...\n" $op $BT_MAC
		bluetoothctl $op $BT_MAC
		sleep $WAIT_FOR
	done
done

printf "Done.\n"