Prove the default bound is wired, and name the option on the failure a consumer reads

CHANGELOG.md

@@ -1,6 +1,6 @@
 # Changelog
 
-## Unreleased
+## 0.6.0 (unreleased)
 
 - `client()` now bounds each connect attempt at 10 seconds, the TLS handshake included, and reports
   one that expires as an ordinary connect failure, so `reconnect` retries it on its usual backoff.

README.md

@@ -227,7 +227,7 @@ All optional. Timeouts and delays are milliseconds.
 | `interfaceVersion` | `0x34` | The SMPP version declared at bind. `0x50` for an SMSC that requires SMPP 5.0. |
 | `systemType`, `addressRange`, `addrTon`, `addrNpi` | `''`, `''`, `0`, `0` | The remaining bind fields, for operators that require them. |
 | `tls` | `false` | `true` for defaults, or a `tls.ConnectionOptions` object for a private CA or a client certificate. |
-| `connectTimeout` | `10000` | Give up on **each connect attempt** the SMSC never completes, the TLS handshake included, and report it as an ordinary connect failure, which `reconnect` then retries. It bounds one attempt, never the `client()` call. `false` waits the operating system out instead, around 130 s on Linux. |
+| `connectTimeout` | `10000` | Give up on **each connect attempt** the SMSC never completes, the TLS handshake included, and report it as an ordinary connect failure, which `reconnect` then retries. It bounds the socket and the handshake — never the `client()` call, and never the wait for the bind response, which is `responseTimeout`. `false` waits the operating system out instead, around 130 s on Linux; `0` is refused. |
 | `enquireLinkInterval` | `20000` | Interval between `enquire_link` on a quiet link. |
 | `idleTimeout` | `2 × enquireLinkInterval` | Give up on a link the peer has stopped answering, and re-bind unless `reconnect` is `false`. |
 | `responseTimeout` | `30000` | How long to wait for a response, and how long a send with no link waits for the next one. `0` waits forever. |

src/client.ts

@@ -41,7 +41,7 @@ export type ClientOptions = {
 	username?: string;
 };
 
-export const defaults = {
+const defaults = {
 	bindType: 'transceiver',
 	connectTimeout: 10_000,
 	enquireLinkInterval: 20_000,
@@ -57,19 +57,22 @@ export const defaults = {
 function armConnectTimeout(
 	sock: Socket,
 	connectTimeout: number | false,
-	peer: string,
+	target: { peer: string; secure: boolean },
 	settle: (result: Result<{ sock: Socket }>) => void,
 ): NodeJS.Timeout | undefined {
 	if (connectTimeout === false) return undefined;
 
-	// A firewall and a stalled handshake need different answers, and only the phase tells them apart.
+	let phase = `connecting to ${target.peer}`;
-	let phase = `connecting to ${peer}`;
 
-	sock.once('connect', () => { phase = `completing the TLS handshake with ${peer}`; });
+	if (target.secure) {
+		sock.once('connect', () => { phase = `completing the TLS handshake with ${target.peer}`; });
+	}
 
 	return setTimeout(() => {
 		sock.destroy();
-		settle({ err: new Error(`Timed out ${phase} after ${String(connectTimeout)} ms`) });
+		settle({
+			err: new Error(`Timed out ${phase} after ${String(connectTimeout)} ms; raise connectTimeout or set it to false`),
+		});
 	}, connectTimeout).unref();
 }
 
@@ -99,12 +102,14 @@ function openSocket(options: ClientOptions): Promise<Result<{ sock: Socket }>> {
 			return;
 		}
 
-		const settle = (result: Result<{ sock: Socket }>): void => {
+		const timer = armConnectTimeout(sock, connectTimeout, { peer: `${host}:${String(port)}`, secure }, settle);
+
+		function settle(result: Result<{ sock: Socket }>): void {
 			clearTimeout(timer);
 			sock.removeListener('error', onError);
 			signal?.removeEventListener('abort', onAbort);
 			resolve(result);
-		};
+		}
 
 		function onError(err: Error): void {
 			settle({ err });
@@ -120,8 +125,6 @@ function openSocket(options: ClientOptions): Promise<Result<{ sock: Socket }>> {
 		sock.once(secure ? 'secureConnect' : 'connect', () => {
 			settle({ sock });
 		});
-
-		const timer = armConnectTimeout(sock, connectTimeout, `${host}:${String(port)}`, settle);
 	});
 }
 

src/error-from.ts

@@ -9,7 +9,9 @@ export function errorFrom(reason: unknown): Error {
 	}
 }
 
-/** String() throws on a null-prototype object or a symbol, so only a string or number is printed. */
+const printable: readonly string[] = ['boolean', 'number', 'string'];
+
+/** String() throws on a null-prototype object or a symbol, so those are named by type instead. */
 export function namedValue(value: unknown): string {
-	return typeof value === 'string' || typeof value === 'number' ? String(value) : typeof value;
+	return printable.includes(typeof value) ? String(value) : typeof value;
 }

src/session-options.ts

@@ -180,7 +180,7 @@ function checkConnectTimeout(connectTimeout: unknown): VoidResult {
 	}
 
 	if (connectTimeout > maxTimerDelay) {
-		return { err: new Error(`connectTimeout must be ${String(maxTimerDelay)} ms or less (about 24 days), got ${got}`) };
+		return { err: new Error(`connectTimeout must be ${String(maxTimerDelay)} ms or less (about 24 days), got ${got}; false waits the OS out instead`) };
 	}
 
 	return {};

test/session-extras.test.ts

@@ -25,7 +25,7 @@ import { DlrMerger } from '../src/dlr-merger.ts';
 import { PduRefusedError } from '../src/pdu-refusal.ts';
 import { objToPdu } from '../src/pdu.ts';
 import { checkSessionOptions, standsInFor } from '../src/session-options.ts';
-import { client, defaults as clientDefaults } from '../src/client.ts';
+import { client } from '../src/client.ts';
 import { closeAfter, closeListenerAfter } from './teardown.ts';
 import { concatOf } from '../src/concat.ts';
 import { consts } from '../src/defs/constants.ts';
@@ -1049,12 +1049,35 @@ describe('connectTimeout', () => {
 		assert.ok(settled.err instanceof Error);
 		assert.match(
 			settled.err.message,
-			new RegExp(`Timed out completing the TLS handshake with 127\\.0\\.0\\.1:${String(port)} after 150 ms`),
+			new RegExp(`Timed out completing the TLS handshake with 127\\.0\\.0\\.1:${String(port)} after 150 ms; raise connectTimeout`),
-			'a firewall and a peer that accepts then stalls need different answers from the operator',
+			'a firewall and a peer that accepts then stalls need different answers, and whoever reads this has never heard of the option',
 		);
 		assert.equal(settled.session, undefined);
 	});
 
+	// The fallback is what every call that names no timeout gets, and localhost settles too fast to see it.
+	test('bounds a connect nobody asked to bound, at the default', async t => {
+		const { accepted, port } = await stalledListener(t);
+
+		t.mock.timers.enable({ apis: ['setTimeout'] });
+
+		const connecting = client({ host: '127.0.0.1', port, reconnect: false, tls: true });
+
+		while (accepted.length === 0) {
+			await new Promise(resolve => setImmediate(resolve));
+		}
+
+		await new Promise(resolve => setImmediate(resolve));
+		t.mock.timers.tick(10_000);
+		t.mock.timers.reset();
+
+		const settled = await within(2000, connecting);
+
+		assert.ok(settled, 'no bound was armed, so nothing ever settled this connect');
+		assert.ok(settled.err instanceof Error);
+		assert.match(settled.err.message, /after 10000 ms/);
+	});
+
 	test('retries a connect it timed out on, like any other failed attempt', async t => {
 		const { accepted, port } = await stalledListener(t);
 		const controller = new AbortController();
@@ -1087,7 +1110,6 @@ describe('connectTimeout', () => {
 	});
 
 	test('refuses a connect timeout that would turn itself off', async () => {
-		assert.equal(clientDefaults.connectTimeout, 10_000, 'the number the README documents');
 		assert.match(
 			checkSessionOptions({ connectTimeout: 0 }).err?.message ?? '',
 			/false waits the OS out/,

todo.md

@@ -190,7 +190,9 @@ the rewrite, for a dependency added later. Maintainer's call, 2026-09-14.
       `reassemblyTimeout`, `responseTimeout` and `shutdownTimeout` take any integer, and `setTimeout`
       fires after 1 ms for anything above 2147483647 — so a value in the wrong unit gets the inverse
       of what it asked for, explained only by a warning on stderr. `connectTimeout` refuses one
-      already, which is the asymmetry to close. Raised by review, 2026-09-20.
+      already, which is the asymmetry to close. The same four print an untyped value bare, so
+      `idleTimeout: '5000'` is refused with `got 5000` — a value the reader reads as correct — where
+      `connectTimeout` quotes it. Raised by review, 2026-09-20.
 
 - [ ] **A send the codec will refuse waits for a link and a window slot first.** `refuse()` in
       `outgoing-requests.ts` runs `misuse()` and the abort check before the wait, precisely so a call