/**
 *  MQTT protocol levels
 */
/** available MQTT Protocol levels
 * 3.1 = 3
 * 3.1.1 = 4
 * 5.0 = 5
 */
export declare const MQTTLevel: {
    readonly unknown: undefined;
    readonly v3: 3;
    readonly v4: 4;
    readonly v5: 5;
};
/** the MQTT protocol level: 3, 4, 5 or undefined */
export type ProtocolLevel = (typeof MQTTLevel)[keyof typeof MQTTLevel];
/** all MQTT protocol levels except 5 */
export type ProtocolLevelNoV5 = Exclude<ProtocolLevel, 5>;
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