Linux bluetoothctl auto pair and connect device

bluetooth.sh

#!/bin/bash

# The MAC address of the Bluetooth device to remove and connect
DEVICE_MAC="AA:AA:AA:AA:AA:AA"

# Create a coprocess for bluetoothctl
coproc bluetoothctl

# Function to send a command to the coprocess
send_command() {
    echo "$1" >&"${COPROC[1]}"
}

# Send initial commands to remove the device and start scanning
send_command "remove $DEVICE_MAC"
send_command "scan on"

# Wait for the device to be discovered
TIMEOUT=30  # Set a timeout of 30 seconds
connected=1
while [ $TIMEOUT -gt 0 ]; do
    # Attempt to connect to the device
    send_command "connect $DEVICE_MAC"
    read -t 1 -u "${COPROC[0]}" output
    # Check if the connection attempt was successful
    if [[ "$output" == *"Connection successful"* ]]; then
        echo "Device $DEVICE_MAC removed (if paired), scanned for, and reconnected (if found)."
        connected=0
        break
    fi
    sleep 1
    ((TIMEOUT--))
done

# Stop scanning
send_command "scan off"

# Close the coprocess
exec {COPROC[1]}>&-
exec {COPROC[0]}<&-

if [ $connected -eq 1 ]; then
    echo "Device $DEVICE_MAC was not rediscovered during scanning or was never paired."
fi