config rule
    option event 'wifi.radio.channel_changed'
    list event_data "{'radio': 0, 'reason': 1}" 
    list event_data "{'channels': [1, 2, 3]}"
    option method 'file->write'
    list method_data "{'path': '/tmp/test_file.txt'}"
    list method_data "{'data': 'channel changed!'}"
