https://github.com/Koenkk/zigbee2mqtt/issues/16918

ext.js

const fz = require('zigbee-herdsman-converters/converters/fromZigbee');
const tz = require('zigbee-herdsman-converters/converters/toZigbee');
const exposes = require('zigbee-herdsman-converters/lib/exposes');
const reporting = require('zigbee-herdsman-converters/lib/reporting');
const legacy = require('zigbee-herdsman-converters/lib/legacy');
const extend = require('zigbee-herdsman-converters/lib/extend');
const ota = require('zigbee-herdsman-converters/lib/ota');
const tuya = require('zigbee-herdsman-converters/lib/tuya');
const utils = require('zigbee-herdsman-converters/lib/utils');
const globalStore = require('zigbee-herdsman-converters/lib/store');
const e = exposes.presets;
const ea = exposes.access;

const definition = {
    zigbeeModel: ['lumi.relay.c2acn01'],
    model: 'LLKZMK11LM',
    vendor: 'Xiaomi',
    description: 'Aqara wireless relay controller',
    fromZigbee: [fz.xiaomi_basic, fz.xiaomi_power, fz.ignore_multistate_report, fz.on_off, fz.xiaomi_basic_raw],
    meta: {multiEndpoint: true},
    toZigbee: [tz.on_off, tz.LLKZMK11LM_interlock, tz.xiaomi_power, tz.xiaomi_switch_power_outage_memory],
    endpoint: (device) => {
        return {'l1': 1, 'l2': 2};
    },
    exposes: [e.power().withAccess(ea.STATE_GET), e.energy(), e.device_temperature(), e.voltage(), e.current(),
        e.switch().withEndpoint('l1'), e.switch().withEndpoint('l2'), e.power_outage_count(false),
        e.power_outage_memory(),
        e.binary('interlock', ea.STATE_SET, true, false)
            .withDescription('Enabling prevents both relais being on at the same time'),
    ],
    ota: ota.zigbeeOTA,
    configure: async (device, coordinatorEndpoint, logger) => {
        await device.getEndpoint(1).removeFromGroup(0);
        device.powerSource = 'Mains (single phase)';
        device.save();
    },
};

module.exports = definition;