/**
 * @module node-opcua-transport
 */
import { type UAString } from "node-opcua-basic-types";
import { BinaryStream, type OutputBinaryStream } from "node-opcua-binary-stream";
import { BaseUAObject } from "node-opcua-factory";
/**
 * The maximum encoded length (in bytes) of the ServerUri and EndpointUrl fields.
 *
 * OPC UA Part 6 §7.1.2.6 (Table 77) mandates that a Client shall reject a
 * ReverseHello whose ServerUri or EndpointUrl exceeds 4096 bytes.
 */
export declare const MAXIMUM_REVERSE_HELLO_FIELD_LENGTH = 4096;
export interface ReverseHelloMessageOptions {
    serverUri?: UAString;
    endpointUrl?: UAString;
}
export declare class ReverseHelloMessage extends BaseUAObject {
    static possibleFields: string[];
    serverUri: UAString;
    endpointUrl: UAString;
    constructor(options?: ReverseHelloMessageOptions);
    encode(stream: OutputBinaryStream): void;
    decode(stream: BinaryStream): void;
    toString(): string;
}
/**
 * Decode a ReverseHello ("RHE") message from a raw TCP message chunk.
 *
 * The chunk MUST be a single, final ("F") RHE frame:
 *   [ 'R' 'H' 'E' ] [ 'F' ] [ UInt32 messageSize ] [ ServerUri ] [ EndpointUrl ]
 *
 * This deliberately does NOT go through `tools.ts#decodeMessage`, whose
 * `is_valid_msg_type` allowlist / ERR special-casing does not apply to RHE, and
 * because the inbound `readMessageHeader` does not itself validate the 3-char
 * message type — so we assert it here.
 *
 * @throws an Error tagged with `.statusCode = BadTcp*` when the message is not a
 *         well-formed RHE or when either field exceeds the 4096-byte spec limit.
 */
export declare function decodeReverseHello(messageChunk: Buffer): ReverseHelloMessage;
/**
 * Validate that ServerUri / EndpointUrl are present and within the 4096-byte limit.
 * Used both on decode (client side) and before packing (server side) so we never
 * emit or accept an out-of-spec ReverseHello.
 *
 * @throws an Error tagged with `.statusCode = BadTcpEndpointUrlInvalid`
 */
export declare function validateReverseHelloFields(reverseHello: ReverseHelloMessage): void;
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