{ pkgs, lib, ... }:
let

  # https://www.zigbee2mqtt.io/devices/RTCGQ01LM.html
  allDevices = {

    "motion_sensor_1" = {
      id = "0x00158d0002fbd451";
      groups = [ "kitchen_room" "kitchen_room_present" ];
    };
    "motion_sensor_2" = {
      id = "0x00158d0002f9a6b8";
      groups = [ "bed_room" "bed_room_present" ];
    };
    "motion_sensor_3" = {
      id = "0x00158d0002f04522";
      groups = [ "living_room" "living_room_present" ];
    };
    "motion_sensor_4" = {
      id = "0x00158d0002f9a558";
      groups = [ "living_room" "living_room_present" ];
    };
    "motion_sensor_5" = {
      id = "0x00158d0002f9a56f";
      groups = [ "bath_room" "bath_room_present" ];
    };
    "motion_sensor_6" = {
      id = "0x00158d0002f9a5cb";
      groups = [ ];
    };
    "motion_sensor_7" = {
      id = "0x00158d0002f9a6aa";
      groups = [ "bed_room" "bed_room_present" ];
    };
    "motion_sensor_8" = {
      id = "0x00158d0002f04637";
      groups = [ "bath_room" "bath_room_present" ];
    };
  };

in {

  services.zigbee2mqtt.devices = lib.mapAttrs' (name:
    { id, timeout ? 65, ... }: {
      name = id;
      value = {
        retain = false;
        friendly_name = name;
        # should not be set below 60 seconds
        occupancy_timeout = timeout;
      };
    }) allDevices;

  #services.homeAssistantConfig = {
  #  # define meta information sensors
  #  sensor = lib.flatten (lib.mapAttrsToList (name:
  #    { ... }: [
  #      {
  #        name = "battery_${name}";
  #        platform = "mqtt";
  #        state_topic = "zigbee2mqtt/${name}";
  #        availability_topic = "zigbee2mqtt/bridge/state";
  #        unit_of_measurement = "%";
  #        icon = "mdi:battery-10";
  #        value_template = "{{ value_json.battery }}";
  #      }
  #      {
  #        name = "link_${name}";
  #        platform = "mqtt";
  #        state_topic = "zigbee2mqtt/${name}";
  #        availability_topic = "zigbee2mqtt/bridge/state";
  #        icon = "mdi:signal";
  #        unit_of_measurement = "lqi";
  #        value_template = "{{ value_json.linkquality }}";
  #      }
  #    ]) allDevices);
  #  binary_sensor = lib.mapAttrsToList (name:
  #    { ... }: {
  #      name = name;
  #      platform = "mqtt";
  #      device_class = "motion";
  #      state_topic = "zigbee2mqtt/${name}";
  #      availability_topic = "zigbee2mqtt/bridge/state";
  #      payload_on = true;
  #      payload_off = false;
  #      value_template = "{{ value_json.occupancy }}";
  #    }) allDevices;
  #  # create groups
  #  # -------------
  #  group = let
  #    # to have nice panels for every device
  #    sensorGroups = lib.mapAttrs (name:
  #      { ... }: {
  #        entities = [
  #          "binary_sensor.${name}"
  #          "sensor.battery_${name}"
  #          "sensor.link_${name}"
  #        ];
  #      }) allDevices;
  #    # sort lights into given groups.
  #    sortedInGroups = let
  #      groupEntries = lib.zipAttrs (lib.flatten (lib.mapAttrsToList (name:
  #        { groups ? [ ], ... }:
  #        map (groupName: { "${groupName}" = "binary_sensor.${name}"; }) groups)
  #        allDevices));
  #    in lib.mapAttrs (name: entities: { inherit entities; }) groupEntries;
  #  in sortedInGroups // sensorGroups // {
  #    all_sensors.entities =
  #      lib.mapAttrsToList (name: { ... }: "binary_sensor.${name}") allDevices;
  #  };
  #};

}