import type { ITransport, TRSMode } from '../../../types/public.js';
import type { TransportRegistry } from '../registry/TransportRegistry.js';
/**
 * Interface for the Transport Router.
 */
export interface ITransportRouter {
    select(slaveId: number, requiredRSMode: TRSMode): ITransport | null;
}
/**
 * Handles the logic of selecting the most appropriate transport for a given request.
 * Prioritizes explicitly assigned transports that are connected, then falls back to compatible transports.
 */
export declare class TransportRouter implements ITransportRouter {
    private readonly _registry;
    /**
     * @param {TransportRegistry} _registry - The registry to query for available transports.
     */
    constructor(_registry: TransportRegistry);
    /**
     * Selects an optimal transport for the given Slave ID and Interface mode.
     *
     * Routing Logic:
     * 1. Finds transports explicitly assigned to the Slave ID that are currently 'connected'.
     * 2. If no direct match is found, looks for a fallback transport that is connected/connecting
     *    and matches the required RSMode (useful for buses like RS485).
     *
     * @param {number} slaveId - The target Modbus Slave/Unit ID.
     * @param {TRSMode} requiredRSMode - The required physical mode (RS485, RS232, or TCP/IP).
     * @returns {ITransport | null} The selected transport instance or null if none are available.
     */
    select(slaveId: number, requiredRSMode: TRSMode): ITransport | null;
}