How to use the thingpedia.Availability function in thingpedia

checkAvailable: function() {
        return Tp.Availability.AVAILABLE;
    },
});

checkAvailable() {
        return Tp.Availability.AVAILABLE;
    }

checkAvailable: function() {
        if (this.own && this.tier === this._tierManager.ownTier)
            return Tp.Availability.AVAILABLE;
        else if (this.tier === Tp.Tier.GLOBAL)
            return Tp.Availability.AVAILABLE;
        else if (this.own)
            return (this._tierManager.isConnected(this.tier) ?
                    Tp.Availability.AVAILABLE :
                    Tp.Availability.UNAVAILABLE);
        else if (this.engine.messaging.isAvailable)
            return Tp.Availability.AVAILABLE;
        else
            return Tp.Availability.UNAVAILABLE;
    },

checkAvailable() {
        return Tp.Availability.AVAILABLE;
    },

checkAvailable() {
        if (Tp.Tier.PHONE === this._tierManager.ownTier) {
            return Tp.Availability.AVAILABLE;
        } else {
            return (this._tierManager.isConnected(Tp.Tier.PHONE) ?
                    Tp.Availability.AVAILABLE :
                    Tp.Availability.OWNER_UNAVAILABLE);
        }
    }

checkAvailable() {
        return Tp.Availability.AVAILABLE;
    }

checkAvailable() {
        if (Tp.Tier.SERVER === this._tierManager.ownTier) {
            return Tp.Availability.AVAILABLE;
        } else {
            return (this._tierManager.isConnected(Tp.Tier.SERVER) ?
                    Tp.Availability.AVAILABLE :
                    Tp.Availability.OWNER_UNAVAILABLE);
        }
    }

checkAvailable: function() {
            return Tp.Availability.AVAILABLE;
        },

return btApi.readUUIDs(this.hwAddress).then((uuids) => {
            if (uuids !== null)
                return Tp.Availability.AVAILABLE;
            else
                return Tp.Availability.UNAVAILABLE;
        });
    }

checkAvailable: function() {
        return Tp.Availability.AVAILABLE;
    }
});