auto connect midi controller script for fluidsynth, rasbian

connectmidicontroller.py

from time import sleep
from subprocess import check_output, CalledProcessError

controller_identifier = 'microKEY2'
configured = False
while True:
    aconnect_list_command = ('aconnect', '-o')
    output_bytes = check_output(aconnect_list_command)    
    output_str = output_bytes.decode('utf8')
    controller_attached = False
    for line in output_str.split('\n'):
        if controller_identifier in line:
            controller_attached = True
            print("{} attached".format(controller_identifier))
            break
        
    if controller_attached and not configured:
        # connect midi controller
        print('connecting ...')
        aconnect_connect_command = "aconnect '{}':0 'fluid':0".format(controller_identifier)
        try:
            output_bytes = check_output(aconnect_connect_command, shell=True)
            configured = True
            print("connected: {}".format(controller_identifier))
        except CalledProcessError as e:
            print(e.args)
        
    elif not controller_attached:
        configured = False
                                 
    sleep(1)
    print('.')