/* others commands not tested
ap_scan 1
set_network 0 0 scan_ssid 1


set: set,
add_network: add_network,
set_network: set_network,
enable_network: enable_network
function set(interface, variable, value, callback) {
    var command = ['wpa_cli -i',
                 interface,
                 'set',
                 variable,
                 value ].join(' ');

    return this.exec(command, parse_command_interface(callback));
}