commit 16c935bb185bdd9e23e4bd336ade0ea68f5f9c50
Author: Lilleman auf Larv <lilleman@larvit.se>
Date:   Tue Aug 25 16:02:27 2026 +0200

    Scaffold ESM TypeScript rewrite as @larvit/smpp

diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..a4fb2bc
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,13 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 4
+indent_style = tab
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.{yaml,yml}]
+indent_size = 2
+indent_style = space
diff --git a/.gitignore b/.gitignore
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index 0000000..28ebeef
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+.claude
+dist
+node_modules
diff --git a/AGENTS.md b/AGENTS.md
new file mode 100644
index 0000000..27eee63
--- /dev/null
+++ b/AGENTS.md
@@ -0,0 +1,107 @@
+# AGENTS.md
+
+Guidance for LLM agents working in this repository. Human-facing documentation lives in
+[README.md](README.md); the remaining work is tracked in [todo.md](todo.md).
+
+## What this is
+
+A ground-up TypeScript rewrite of `larvitsmpp` 0.4.0, published as `@larvit/smpp` 1.0.0. The branch
+started from an orphan commit — no history from 0.4.0 is carried over. The 0.4.0 source is still
+readable on the `master` branch of the same repository and is the reference for protocol behaviour,
+not for structure or style.
+
+The library's value is its very small API. Do not grow the public surface without being asked.
+
+## Hard rules
+
+These are not preferences. Breaking one is a defect.
+
+1. **Nothing throws.** Every fallible function returns (or resolves to) a DTO carrying an optional
+   `err`. No `throw`, no rejected promises, no exceptions as control flow. Node APIs that throw are
+   wrapped at the boundary and converted into a result. Programmer errors (bad arguments) are
+   results too.
+2. **Log messages are static strings.** Every dynamic value goes into `@larvit/log` metadata. Never
+   interpolate, never concatenate.
+   - GOOD: `log.debug('sendSms() - splitting message', { parts: msgs.length, to });`
+   - BANNED: `log.debug('sendSms() - splitting into ' + msgs.length + ' parts');`
+3. **No `error` event.** Node makes an unhandled `error` event throw, which would break rule 1.
+   Sessions emit `sessionError`, servers emit `serverError`.
+4. **No casts, no non-null assertions.** `as`, `as unknown as` and `!` are all banned. Parse untyped
+   input once through a type guard at the boundary; everything past it is typed.
+
+## Architecture
+
+```
+src/
+	index.ts          Public surface. Named exports only, no default export.
+	client.ts         client() -> { err, session }
+	server.ts         server() -> { err, server }, server owns the listener + close()
+	session.ts        Session: framing, sequence numbers, the send window, events
+	sms.ts            The live handle emitted as the 'sms' event (sendResp/sendDlr)
+	message.ts        Encoding detection, splitting, bit counting, SMPP date formatting
+	pdu.ts            pduToObj / objToPdu / pduReturn — synchronous, result-returning
+	defs/
+		commands.ts   The 33 commands, their ids and ordered parameter lists
+		constants.ts  consts + constsById (TON, NPI, ENCODING, MESSAGE_STATE, …)
+		encodings.ts  GSM 03.38, LATIN1, UCS2 and detection
+		errors.ts     errors + errorsById (ESME_*)
+		filters.ts    Per-field encode/decode hooks (time, message, callback_num, …)
+		tlvs.ts       TLV definitions, tlvsById
+		types.ts      Wire types: int8/int16/int32/string/cstring/buffer/arrays
+```
+
+Dependency direction is one way: `defs` knows nothing above it, `pdu` uses `defs`, `session` uses
+`pdu`, and `client`/`server` use `session`. Nothing reaches back up.
+
+**Parameter order is wire order.** The key order inside `cmds.*.params` is the order the fields are
+written to and read from the buffer. Never sort those alphabetically — the alphabetical-ordering
+convention applies everywhere else, but here it corrupts every PDU.
+
+## Toolchain
+
+Run everything through the container; never invoke node or npm on the host.
+
+```bash
+docker compose run --rm node npm install
+docker compose run --rm node npm test
+docker compose run --rm node npm run build
+```
+
+- Tests are `.ts` and run directly under Node's type stripping — no build step in the dev loop.
+- Source imports use `.ts` extensions; `rewriteRelativeImportExtensions` emits `.js` into `dist`.
+- `erasableSyntaxOnly` is on, so no enums, no namespaces, no parameter properties. Use `as const`
+  objects plus union types.
+- The published floor is Node 18, but the dev container runs Node 24 (type stripping needs it). CI
+  compiles the tests and runs them on 18/20/22/24, so the floor is verified rather than asserted.
+- `typescript` is pinned to the 6.x line because `typescript-eslint` peer-requires `<6.1.0`. Move to
+  TypeScript 7 once that constraint lifts.
+
+## Defects found in 0.4.0
+
+Confirmed by reading the 0.4.0 source. The rewrite fixes all of them; each needs a regression test
+naming the behaviour, and the wire-affecting ones are cross-checked against a reference
+implementation (see todo.md).
+
+| Defect | 0.4.0 behaviour |
+| --- | --- |
+| LATIN1 never decodes | `decodeMsg` loops `consts.ENCODING` without breaking, so `data_coding` 0x03 lands on the alias `ISO_8859_1`, which has no decoder, and silently falls back to ASCII |
+| Oversized segments | `splitMsg` emits 152 GSM chars + 6-byte UDH = 158 octets, over the 140-octet limit; UCS2 gets 66 chars where 67 fit |
+| DLR month off by one | `smppDate()` uses `getMonth()` (0-based) without `+1`, so January renders as `00` |
+| Non-standard DLR status | Receipts emit `stat:UNDELIVERABLE`; the spec's field is 7 characters (`UNDELIV`) |
+| Flash destroys UCS2 | `flash: true` overwrites `data_coding` with 0x10, discarding the UCS2 alphabet, which needs 0x18 |
+| Shared concat reference | The concatenation reference counter is a module-level global shared by every session in the process |
+| `send()` never times out | Each call adds a listener keyed on the sequence number; a peer that never answers leaks it and the promise never settles |
+| `tls: true` is not TLS | Constructs a bare `new tls.Socket()` with no handshake instead of `tls.connect()` |
+| Alphanumeric sender TON | `sendSms` hardcodes `source_addr_ton` to 1 (international) even for alphanumeric senders, which require TON 5 |
+| Text-only DLRs refused | `deliver_sm` without both `message_state` and `receipted_message_id` TLVs is rejected with `ESME_RINVTLVSTREAM`, so Kannel-style receipts are unusable |
+| Unbounded reassembly | Incomplete long-SMS groups are capped by nothing and swept only when other traffic arrives, after 24 hours |
+| Dead DLR aggregation | `longSmsDlrs` is allocated to merge per-segment receipts and then never used |
+
+## Conventions
+
+- Hard tabs. Alphabetical ordering for keys, imports and lists unless order is logic-significant
+  (see the wire-order note above).
+- Comments are the exception, not the default — see the root `CLAUDE.md` rules. Do not write file
+  preambles or restate what the code says.
+- Test data uses real randomised UUID v7 values, never `aaaa-0000` placeholders.
+- `message_id` values the library generates are UUID v7.
diff --git a/CLAUDE.md b/CLAUDE.md
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index 0000000..8b7cbf4
--- /dev/null
+++ b/CLAUDE.md
@@ -0,0 +1 @@
+See [AGENTS.md](AGENTS.md).
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..6ea5363
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,22 @@
+The MIT License (MIT)
+
+Copyright (c) 2018 Larv IT AB
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..ba03071
--- /dev/null
+++ b/README.md
@@ -0,0 +1,208 @@
+# @larvit/smpp
+
+A simplified implementation of the SMPP protocol, in TypeScript. ESM only, types included.
+
+Successor to [larvitsmpp](https://www.npmjs.com/package/larvitsmpp) 0.4.0. The API is the same shape
+it has always been — connect, send an SMS, listen for delivery reports — with callbacks replaced by
+promises and the rough edges taken off.
+
+> **Status: not released.** This branch is a rewrite in progress and nothing here is published yet.
+> The API below is the agreed design and is being implemented against it; see
+> [todo.md](todo.md) for what is done and what is not. Use `larvitsmpp` 0.4.0 until 1.0.0 ships.
+
+## Requirements
+
+Node 18 or later.
+
+## Install
+
+```bash
+npm install @larvit/smpp
+```
+
+## Client
+
+The simplest possible client — connects to localhost:2775 with no credentials and sends a message:
+
+```javascript
+import { client } from '@larvit/smpp';
+
+const { err, session } = await client();
+if (err) throw err;
+
+await session.sendSms({
+	from:    '46701113311',
+	message: 'Hello world',
+	to:      '46709771337',
+});
+
+await session.unbind();
+```
+
+With connection parameters, a delivery report and logging:
+
+```javascript
+import { Log } from '@larvit/log';
+import { client } from '@larvit/smpp';
+
+const log = new Log('debug');
+
+const { err, session } = await client({
+	host:     'smpp.somewhere.com',
+	log,
+	password: 'bar',
+	port:     2775,
+	username: 'foo',
+});
+if (err) throw err;
+
+session.on('dlr', dlr => {
+	// dlr.smsId, dlr.statusMsg, dlr.statusId
+});
+
+const { err: sendErr, smsIds } = await session.sendSms({
+	dlr:     true,
+	from:    '46701113311',
+	message: '«baff»',
+	to:      '46709771337',
+});
+```
+
+## Server
+
+The simplest possible server — no authentication, listening on port 2775:
+
+```javascript
+import { server } from '@larvit/smpp';
+
+const { err, server: smpp } = await server();
+if (err) throw err;
+
+smpp.on('session', session => {
+	session.on('sms', async sms => {
+		// sms.from, sms.to, sms.message, sms.dlr
+	});
+});
+```
+
+With authentication and delivery reports:
+
+```javascript
+import { server } from '@larvit/smpp';
+
+const { err, server: smpp } = await server({
+	// Replace with your own auth. Returning an object attaches it to session.userData.
+	authenticate: async ({ password, systemId }) => {
+		if (systemId !== 'foo' || password !== 'bar') return false;
+
+		return { userData: { userId: 123 } };
+	},
+});
+if (err) throw err;
+
+smpp.on('session', session => {
+	session.on('sms', async sms => {
+		// Responding is part of the protocol, not optional.
+		// Defaults to ESME_ROK; see the SMPP spec for the other status codes.
+		await sms.sendResp();
+
+		if (sms.dlr) {
+			await sms.sendDlr(); // same as sms.sendDlr('DELIVERED')
+		}
+	});
+});
+
+await smpp.close();
+```
+
+`sendDlr` accepts `SCHEDULED`, `ENROUTE`, `DELIVERED`, `EXPIRED`, `DELETED`, `UNDELIVERABLE`,
+`ACCEPTED`, `UNKNOWN`, `REJECTED` and `SKIPPED`.
+
+## Errors
+
+Nothing in this library throws. Every fallible call returns a result carrying an optional `err`, so
+failures are handled in one place instead of two:
+
+```javascript
+const { err, session } = await client({ host: 'smpp.somewhere.com' });
+if (err) return;
+
+const { err: sendErr, smsIds } = await session.sendSms({ from, message, to });
+```
+
+Runtime failures on a live connection arrive as `sessionError` and `serverError` events. They are
+deliberately not called `error`: Node turns an unhandled `error` event into a thrown exception, which
+is exactly what this library promises not to do.
+
+## Sessions
+
+### Events
+
+| Event | Fires when |
+| --- | --- |
+| `sms` | An SMS arrives. Carries `sendResp()` and `sendDlr()`. |
+| `dlr` | A delivery report arrives, one per segment. |
+| `messageDlr` | Every segment of a multipart message has been reported on. |
+| `close` | The socket closed. |
+| `reconnected` | The client re-bound after a drop (only with `reconnect` configured). |
+| `sessionError` | Something failed on a live session. |
+| `data` | Raw bytes arrived on the socket. |
+| `incomingPdu` | A complete PDU arrived, as a buffer. |
+| `incomingPduObj` | The same PDU, parsed into an object. |
+
+### Methods
+
+`sendSms()`, `send()`, `sendReturn()`, `unbind()` and `close()`. `send()` reaches any of the 33 SMPP
+commands the codec knows, not just the four the session handles natively.
+
+## Migrating from larvitsmpp 0.4.0
+
+- **The package is now `@larvit/smpp`** and is ESM only. `require()` no longer works.
+- **Callbacks are gone.** `client`, `server`, `sendSms`, `sendResp` and `sendDlr` are all promises
+  resolving to a result object with an optional `err`. Nothing rejects.
+- **`server()` resolves once, when it is listening**, and gives you a handle with `close()` and a
+  `session` event. It no longer calls your callback once per incoming connection.
+- **`checkuserpass` is now `authenticate`**, takes `{ password, systemId }` and returns `false` or
+  `{ userData }`.
+- **Renamed options:** `enqLinkTiming` → `enquireLinkInterval`, server `timeout` → `idleTimeout`.
+- **`larvitsmpp.utils` is gone.** Its contents are named exports: `bitCount`, `decodeMessage`,
+  `encodeMessage`, `objToPdu`, `pduReturn`, `pduToObj`, `smppDate`, `splitMessage`. The PDU codec is
+  synchronous and returns `{ err, pduObj }` / `{ err, buffer }`.
+- **`pduObj.isResp()` is now the standalone `isResp(pduObj)`.**
+- **The `error` event is `sessionError`** (and `serverError` on the server handle).
+- **`log`** takes a [`@larvit/log`](https://www.npmjs.com/package/@larvit/log) instance instead of a
+  `larvitutils` one, and is silent by default.
+
+### Behaviour that changed on the wire
+
+0.4.0 had a number of protocol defects. Fixing them changes the bytes it puts on the wire, so if you
+have worked around any of these, remove the workaround:
+
+- Multipart segments were 158 octets, over the 140-octet limit. They are now correctly sized.
+- LATIN1 (`data_coding` 0x03) was silently decoded as ASCII, corrupting the message.
+- Delivery receipt dates were a month off, and the status field read `UNDELIVERABLE` where the spec
+  defines the 7-character `UNDELIV`.
+- `flash: true` discarded UCS2, mangling flash messages containing non-GSM characters.
+- The multipart reference counter was shared by every session in the process.
+- `tls: true` never performed a handshake, so the connection was not actually encrypted.
+- Alphanumeric senders were sent with TON 1 (international) instead of TON 5.
+- Delivery receipts carrying only the standard receipt text, with no TLVs — what Kannel and several
+  other SMSCs send — were rejected outright. They are now parsed.
+
+## Development
+
+Everything runs in the container; nothing is installed on the host.
+
+```bash
+docker compose run --rm node npm install
+docker compose run --rm node npm test     # lint, typecheck and tests
+docker compose run --rm node npm run build
+```
+
+Tests are TypeScript and run directly under Node's type stripping, so there is no build step in the
+development loop. CI additionally compiles and runs them on Node 18, 20, 22 and 24 to verify the
+supported range.
+
+## License
+
+MIT
diff --git a/compose.yaml b/compose.yaml
new file mode 100644
index 0000000..f37bde7
--- /dev/null
+++ b/compose.yaml
@@ -0,0 +1,10 @@
+services:
+  node:
+    image: node:24.18.0-bookworm-slim
+    init: true
+    user: "1000:1000"
+    working_dir: /app
+    volumes:
+      - .:/app
+    environment:
+      NPM_CONFIG_CACHE: /tmp/npm-cache
diff --git a/eslint.config.js b/eslint.config.js
new file mode 100644
index 0000000..6e53bef
--- /dev/null
+++ b/eslint.config.js
@@ -0,0 +1,26 @@
+import eslint from '@eslint/js';
+import tseslint from 'typescript-eslint';
+
+export default tseslint.config(
+	{ ignores: ['dist/'] },
+	eslint.configs.recommended,
+	tseslint.configs.strictTypeChecked,
+	tseslint.configs.stylisticTypeChecked,
+	{
+		languageOptions: {
+			parserOptions: {
+				projectService: true,
+				tsconfigRootDir: import.meta.dirname,
+			},
+		},
+		rules: {
+			'@typescript-eslint/consistent-type-definitions': ['error', 'type'],
+			'@typescript-eslint/no-non-null-assertion': 'error',
+			'no-console': 'error',
+		},
+	},
+	{
+		files: ['eslint.config.js'],
+		extends: [tseslint.configs.disableTypeChecked],
+	},
+);
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..b63b9d6
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,1281 @@
+{
+	"name": "larvitsmpp",
+	"version": "1.0.0",
+	"lockfileVersion": 3,
+	"requires": true,
+	"packages": {
+		"": {
+			"name": "larvitsmpp",
+			"version": "1.0.0",
+			"license": "MIT",
+			"dependencies": {
+				"@larvit/log": "2.3.0"
+			},
+			"devDependencies": {
+				"@eslint/js": "10.0.1",
+				"@types/node": "22.20.1",
+				"eslint": "10.9.1",
+				"typescript": "6.0.3",
+				"typescript-eslint": "8.68.0"
+			},
+			"engines": {
+				"node": ">=22.0.0"
+			}
+		},
+		"node_modules/@eslint-community/eslint-utils": {
+			"version": "4.10.1",
+			"resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.10.1.tgz",
+			"integrity": "sha512-cuadcxVFE8sDK6iWJbs8Sn0av2Nrh2QSGQhVlBW9AaAHqHwjWsZHT8LJ4hFGPh7ASBV2deFdM7H/DPjulmh8rg==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"eslint-visitor-keys": "^3.4.3"
+			},
+			"engines": {
+				"node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+			},
+			"funding": {
+				"url": "https://opencollective.com/eslint"
+			},
+			"peerDependencies": {
+				"eslint": "^6.0.0 || ^7.0.0 || >=8.0.0"
+			}
+		},
+		"node_modules/@eslint-community/eslint-utils/node_modules/eslint-visitor-keys": {
+			"version": "3.4.3",
+			"resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-3.4.3.tgz",
+			"integrity": "sha512-wpc+LXeiyiisxPlEkUzU6svyS1frIO3Mgxj1fdy7Pm8Ygzguax2N3Fa/D/ag1WqbOprdI+uY6wMUl8/a2G+iag==",
+			"dev": true,
+			"license": "Apache-2.0",
+			"engines": {
+				"node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+			},
+			"funding": {
+				"url": "https://opencollective.com/eslint"
+			}
+		},
+		"node_modules/@eslint-community/regexpp": {
+			"version": "4.12.2",
+			"resolved": "https://registry.npmjs.org/@eslint-community/regexpp/-/regexpp-4.12.2.tgz",
+			"integrity": "sha512-EriSTlt5OC9/7SXkRSCAhfSxxoSUgBm33OH+IkwbdpgoqsSsUg7y3uh+IICI/Qg4BBWr3U2i39RpmycbxMq4ew==",
+			"dev": true,
+			"license": "MIT",
+			"engines": {
+				"node": "^12.0.0 || ^14.0.0 || >=16.0.0"
+			}
+		},
+		"node_modules/@eslint/config-array": {
+			"version": "0.23.5",
+			"resolved": "https://registry.npmjs.org/@eslint/config-array/-/config-array-0.23.5.tgz",
+			"integrity": "sha512-Y3kKLvC1dvTOT+oGlqNQ1XLqK6D1HU2YXPc52NmAlJZbMMWDzGYXMiPRJ8TYD39muD/OTjlZmNJ4ib7dvSrMBA==",
+			"dev": true,
+			"license": "Apache-2.0",
+			"dependencies": {
+				"@eslint/object-schema": "^3.0.5",
+				"debug": "^4.3.1",
+				"minimatch": "^10.2.4"
+			},
+			"engines": {
+				"node": "^20.19.0 || ^22.13.0 || >=24"
+			}
+		},
+		"node_modules/@eslint/config-helpers": {
+			"version": "0.7.0",
+			"resolved": "https://registry.npmjs.org/@eslint/config-helpers/-/config-helpers-0.7.0.tgz",
+			"integrity": "sha512-DObd/KKUsU+FaFv4PLxSRenpXfQWmPXXP3pPZ6/K1PCrMu2vQpMDMuQe/BqYeoLcz8ro0bVDF1RxOJgfVEdhUw==",
+			"dev": true,
+			"license": "Apache-2.0",
+			"dependencies": {
+				"@eslint/core": "^1.2.1"
+			},
+			"engines": {
+				"node": "^20.19.0 || ^22.13.0 || >=24"
+			}
+		},
+		"node_modules/@eslint/core": {
+			"version": "1.2.1",
+			"resolved": "https://registry.npmjs.org/@eslint/core/-/core-1.2.1.tgz",
+			"integrity": "sha512-MwcE1P+AZ4C6DWlpin/OmOA54mmIZ/+xZuJiQd4SyB29oAJjN30UW9wkKNptW2ctp4cEsvhlLY/CsQ1uoHDloQ==",
+			"dev": true,
+			"license": "Apache-2.0",
+			"dependencies": {
+				"@types/json-schema": "^7.0.15"
+			},
+			"engines": {
+				"node": "^20.19.0 || ^22.13.0 || >=24"
+			}
+		},
+		"node_modules/@eslint/js": {
+			"version": "10.0.1",
+			"resolved": "https://registry.npmjs.org/@eslint/js/-/js-10.0.1.tgz",
+			"integrity": "sha512-zeR9k5pd4gxjZ0abRoIaxdc7I3nDktoXZk2qOv9gCNWx3mVwEn32VRhyLaRsDiJjTs0xq/T8mfPtyuXu7GWBcA==",
+			"dev": true,
+			"license": "MIT",
+			"engines": {
+				"node": "^20.19.0 || ^22.13.0 || >=24"
+			},
+			"funding": {
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+			},
+			"peerDependencies": {
+				"typescript": ">=4.8.4"
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+			"license": "Apache-2.0",
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+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..5c65b83
--- /dev/null
+++ b/package.json
@@ -0,0 +1,59 @@
+{
+	"name": "@larvit/smpp",
+	"version": "1.0.0",
+	"description": "Simplified SMPP implementation",
+	"keywords": [
+		"esm",
+		"pdu",
+		"sms",
+		"smpp",
+		"typescript"
+	],
+	"homepage": "https://github.com/larvit/larvitsmpp",
+	"bugs": {
+		"url": "https://github.com/larvit/larvitsmpp/issues"
+	},
+	"repository": {
+		"type": "git",
+		"url": "git+https://github.com/larvit/larvitsmpp.git"
+	},
+	"license": "MIT",
+	"author": {
+		"name": "Mikael 'Lilleman' Göransson",
+		"email": "lilleman@larvit.se",
+		"url": "http://github.com/larvit/larvitsmpp"
+	},
+	"type": "module",
+	"exports": {
+		".": {
+			"types": "./dist/index.d.ts",
+			"default": "./dist/index.js"
+		}
+	},
+	"files": [
+		"dist"
+	],
+	"engines": {
+		"node": ">=18.0.0"
+	},
+	"publishConfig": {
+		"access": "public",
+		"provenance": true
+	},
+	"scripts": {
+		"build": "tsc --project tsconfig.build.json",
+		"lint": "eslint . && tsc --noEmit",
+		"prepack": "npm run build",
+		"test": "npm run lint && node --test 'test/**/*.test.ts'"
+	},
+	"devDependencies": {
+		"@eslint/js": "10.0.1",
+		"@types/node": "22.20.1",
+		"eslint": "10.9.1",
+		"typescript": "6.0.3",
+		"typescript-eslint": "8.68.0"
+	},
+	"dependencies": {
+		"@larvit/log": "2.3.0"
+	}
+}
diff --git a/src/defs/constants.ts b/src/defs/constants.ts
new file mode 100644
index 0000000..5b7f2f6
--- /dev/null
+++ b/src/defs/constants.ts
@@ -0,0 +1,114 @@
+export const consts = {
+	BROADCAST_AREA_FORMAT: {
+		ALIAS: 0x00,
+		ELLIPSOID_ARC: 0x01,
+		NAME: 0x00,
+		POLYGON: 0x02,
+	},
+	BROADCAST_FREQUENCY_INTERVAL: {
+		DAYS: 0x0B,
+		HOURS: 0x0A,
+		MAX_POSSIBLE: 0x00,
+		MINUTES: 0x09,
+		MONTHS: 0x0D,
+		SECONDS: 0x08,
+		WEEKS: 0x0C,
+		YEARS: 0x0E,
+	},
+	ENCODING: {
+		ASCII: 0x01,
+		BINARY: 0x04,
+		CYRILLIC: 0x06,
+		EXTENDED_KANJI_JIS: 0x0D,
+		FLASH: 0x10,
+		HEBREW: 0x07,
+		IA5: 0x01,
+		ISO_2022_JP: 0x0A,
+		ISO_8859_1: 0x03,
+		ISO_8859_5: 0x06,
+		ISO_8859_8: 0x07,
+		JIS: 0x05,
+		KS_C_5601: 0x0E,
+		LATIN1: 0x03,
+		PICTOGRAM: 0x09,
+		UCS2: 0x08,
+		X_0208_1990: 0x05,
+		X_0212_1990: 0x0D,
+	},
+	ESM_CLASS: {
+		CONVERSATION_ABORT: 0x18,
+		DATAGRAM: 0x01,
+		DELIVERY_ACKNOWLEDGEMENT: 0x08,
+		FORWARD: 0x02,
+		INTERMEDIATE_DELIVERY: 0x20,
+		MC_DELIVERY_RECEIPT: 0x04,
+		SET_REPLY_PATH: 0x80,
+		STORE_FORWARD: 0x03,
+		UDH_INDICATOR: 0x40,
+		USER_ACKNOWLEDGEMENT: 0x10,
+	},
+	MESSAGE_STATE: {
+		ACCEPTED: 6,
+		DELETED: 4,
+		DELIVERED: 2,
+		ENROUTE: 1,
+		EXPIRED: 3,
+		REJECTED: 8,
+		SCHEDULED: 0,
+		SKIPPED: 9,
+		UNDELIVERABLE: 5,
+		UNKNOWN: 7,
+	},
+	NETWORK: {
+		CDMA: 0x03,
+		GENERIC: 0x00,
+		GSM: 0x01,
+		TDMA: 0x02,
+	},
+	NPI: {
+		DATA: 0x03,
+		ERMES: 0x0A,
+		INTERNET: 0x0E,
+		IP: 0x0E,
+		ISDN: 0x01,
+		LAND_MOBILE: 0x06,
+		NATIONAL: 0x08,
+		PRIVATE: 0x09,
+		TELEX: 0x04,
+		UNKNOWN: 0x00,
+		WAP: 0x12,
+	},
+	REGISTERED_DELIVERY: {
+		DELIVERY_ACKNOWLEDGEMENT: 0x04,
+		FAILURE: 0x02,
+		FINAL: 0x01,
+		INTERMEDIATE: 0x10,
+		SUCCESS: 0x03,
+		USER_ACKNOWLEDGEMENT: 0x08,
+	},
+	TON: {
+		ABBREVIATED: 0x06,
+		ALPHANUMERIC: 0x05,
+		INTERNATIONAL: 0x01,
+		NATIONAL: 0x02,
+		NETWORK_SPECIFIC: 0x03,
+		SUBSCRIBER_NUMBER: 0x04,
+		UNKNOWN: 0x00,
+	},
+} as const;
+
+export type ConstGroup = keyof typeof consts;
+export type MessageState = keyof typeof consts.MESSAGE_STATE;
+
+// Aliased values (NPI.IP === NPI.INTERNET === 0x0E) resolve to whichever name sorts last.
+export const constsById: Record<string, Record<number, string>> = {};
+
+for (const [groupName, group] of Object.entries(consts)) {
+	const byId: Record<number, string> = {};
+
+	for (const [name, value] of Object.entries(group)) {
+		byId[value] = name;
+	}
+
+	constsById[groupName] = byId;
+}
diff --git a/src/result.ts b/src/result.ts
new file mode 100644
index 0000000..9570760
--- /dev/null
+++ b/src/result.ts
@@ -0,0 +1,9 @@
+/**
+ * Either a failure carrying err, or a success carrying T. Both branches declare every key, so
+ * callers can destructure once and let `if (err)` narrow what is left.
+ */
+export type Result<T> =
+	| ({ err: Error } & Partial<Record<keyof T, undefined>>)
+	| ({ err?: undefined } & T);
+
+export type VoidResult = { err?: Error };
diff --git a/test/result.test.ts b/test/result.test.ts
new file mode 100644
index 0000000..2353956
--- /dev/null
+++ b/test/result.test.ts
@@ -0,0 +1,29 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import type { Result } from '../src/result.ts';
+
+function parse(input: string): Result<{ value: number }> {
+	const value = Number(input);
+
+	if (Number.isNaN(value)) return { err: new Error('not a number') };
+
+	return { value };
+}
+
+test('destructuring a result narrows on err', () => {
+	const { err, value } = parse('42');
+
+	if (err) {
+		assert.fail('should have parsed');
+	}
+
+	// Fails to compile if narrowing does not remove undefined from value.
+	assert.equal(value.toFixed(0), '42');
+});
+
+test('a failed result carries err and nothing else', () => {
+	const { err, value } = parse('nope');
+
+	assert.ok(err instanceof Error);
+	assert.equal(value, undefined);
+});
diff --git a/todo.md b/todo.md
new file mode 100644
index 0000000..9f42706
--- /dev/null
+++ b/todo.md
@@ -0,0 +1,225 @@
+# todo.md
+
+Remaining work for the `@larvit/smpp` 1.0.0 rewrite. Read [AGENTS.md](AGENTS.md) first — the hard
+rules there constrain every item below.
+
+## How to resume
+
+```bash
+docker compose run --rm node npm install
+docker compose run --rm node npm test
+```
+
+Work top to bottom. Each task states what "done" means. Tests come before implementation: write the
+failing test for the behaviour, then implement until it passes. The 0.4.0 implementation is on the
+`master` branch of this repository and is the reference for protocol behaviour — read it, do not
+copy its structure.
+
+## The agreed API
+
+Settled with the maintainer before implementation started. Do not change any of it without asking;
+it is the contract the tasks below implement.
+
+```ts
+import { client, server, consts, defs, errors, objToPdu, pduToObj } from '@larvit/smpp';
+
+// --- client ---------------------------------------------------------------
+const { err, session } = await client({
+	addrNpi:             0,              // optional, bind field
+	addrTon:             0,              // optional, bind field
+	addressRange:        '',             // optional, bind field
+	bindType:            'transceiver',  // 'transceiver' | 'transmitter' | 'receiver'
+	enquireLinkInterval: 20000,
+	host:                'localhost',
+	interfaceVersion:    0x50,           // optional, bind field
+	log,                                 // @larvit/log LogInt, silent by default
+	maxOutstanding:      10,             // in-flight requests before sends queue
+	password:            'pass',
+	port:                2775,
+	reconnect:           { maxDelay: 30000, minDelay: 1000 },  // optional, opt-in
+	responseTimeout:     30000,
+	signal,                              // optional AbortSignal
+	systemType:          '',             // optional, bind field
+	tls:                 false,          // boolean or tls.ConnectionOptions
+	username:            'user',
+});
+
+const { err, pduObjs, smsIds } = await session.sendSms({
+	dlr:                  false,
+	encoding:             'UCS2',        // optional, overrides auto-detection
+	flash:                false,
+	from:                 'MyBrand',     // alphanumeric -> TON 5, digits -> TON 1
+	message:              'Hello world',
+	scheduleDeliveryTime: undefined,     // optional
+	to:                   '46709771337',
+	validityPeriod:       undefined,     // optional
+}, { signal });                          // optional per-call AbortSignal
+
+await session.unbind();
+await session.close();
+
+// --- server ---------------------------------------------------------------
+const { err, server: smpp } = await server({
+	authenticate: async ({ password, systemId }) => {
+		if (systemId !== 'foo' || password !== 'bar') return false;
+
+		return { userData: { userId: 123 } };   // attached to session.userData
+	},
+	idleTimeout:       40000,
+	log,
+	maxReassembly:     1000,
+	port:              2775,
+	reassemblyTimeout: 300000,
+	signal,
+	tls:               false,
+});
+
+smpp.port;             // resolved port, useful when 0 was requested
+await smpp.close();
+
+smpp.on('session', session => {
+	session.on('sms', async sms => {
+		const { err } = await sms.sendResp();          // defaults to ESME_ROK
+		if (sms.dlr) await sms.sendDlr('DELIVERED');   // defaults to DELIVERED
+	});
+});
+```
+
+### Events
+
+| Emitter | Event | Payload |
+| --- | --- | --- |
+| server | `session` | `Session` |
+| server | `serverError` | `Error` |
+| session | `sms` | `Sms` (live handle: `sendResp()`, `sendDlr()`) |
+| session | `dlr` | one per segment — `{ doneDate?, errorCode?, smsId, statusId, statusMsg }` |
+| session | `messageDlr` | merged once all segments of a message are accounted for — adds `segments` and the worst status across them |
+| session | `sessionError` | `Error` |
+| session | `close` | — |
+| session | `reconnected` | — (only when `reconnect` is configured) |
+| session | `data` | `Buffer` |
+| session | `incomingPdu` | `Buffer` |
+| session | `incomingPduObj` | `PduObject` |
+
+### Rules the API follows
+
+- **Never throws.** Everything fallible resolves to `{ err?, … }`. See AGENTS.md rule 1.
+- **Named exports only.** No default export. `defs` stays as a grouped export alongside the
+  individual tables (`cmds`, `consts`, `encodings`, `errors`, `tlvs`, `types`, and the `*ById` maps).
+- **`utils` is gone.** Its contents are named exports: `bitCount`, `decodeMessage`, `encodeMessage`,
+  `objToPdu`, `pduReturn`, `pduToObj`, `smppDate`, `splitMessage`.
+- **The PDU codec is synchronous** and returns `{ err?, pduObj? }` / `{ err?, buffer? }`.
+- **Low-level surface stays public**, including `session.sock`, `session.send()` and
+  `session.sendReturn()` — that is how the other 29 commands are reached.
+- `pduObj.isResp()` is now the standalone export `isResp(pduObj)`; PDU objects are pure data.
+
+## Tasks
+
+### 1. Definition tables — `src/defs/`
+
+- [x] `constants.ts` — `consts` + `constsById`.
+- [ ] `errors.ts` — all `ESME_*` codes plus `errorsById`. Port from 0.4.0 `lib/defs.js`; note that
+      0.4.0 has a typo, `ESME_RINVBCASTCHANIND = 0x011` (three digits), which should be `0x0111`.
+      Verify every code against the SMPP 3.4/5.0 spec while porting.
+- [ ] `types.ts` — wire types `int8`, `int16`, `int32`, `string`, `cstring`, `buffer`,
+      `dest_address_array`, `unsuccess_sme_array`, and the `tlv` variants. Each is
+      `{ default, read(buffer, offset, length?), size(value), write(value, buffer, offset) }`.
+      `read` must be bounds-checked and return a result rather than throwing.
+- [ ] `encodings.ts` — GSM 03.38 (`ASCII`), `LATIN1`, `UCS2`, `FLASH` (alias of ASCII) and `detect`.
+      Drop `iconv-lite`: LATIN1 is `Buffer.from(str, 'latin1')`, UCS2 is `Buffer.from(str,
+      'utf16le').swap16()` (copy before swapping, and reject odd-length input on decode).
+- [ ] `filters.ts` — `time`, `message`, `billing_identification`, `broadcast_area_identifier`,
+      `broadcast_content_type`, `broadcast_frequency_interval`, `callback_num`, `callback_num_atag`.
+- [ ] `tlvs.ts` — the 67 TLV definitions plus `tlvsById` and the two aliases
+      (`alert_on_msg_delivery`, `failed_broadcast_area_identifier`).
+- [ ] `commands.ts` — all 33 commands with ids and **wire-ordered** parameter lists, plus `cmdsById`.
+
+### 2. Message helpers — `src/message.ts`
+
+- [ ] `bitCount(msg, encoding?)`, `encodeMessage`, `decodeMessage`, `smppDate`, `splitMessage`.
+- [ ] **Fix:** segments are 134 GSM characters or 67 UCS2 characters, so that segment + 6-byte UDH
+      is exactly 140 octets. 0.4.0 produces 152/66.
+- [ ] **Fix:** `smppDate` must add 1 to `getMonth()` and zero-pad correctly.
+- [ ] **Fix:** LATIN1 must actually decode — resolve `data_coding` to a concrete encoding, not to
+      whichever alias happens to sort last.
+- [ ] The concatenation reference counter is per session, not module-global. `splitMessage` therefore
+      takes the reference as an argument instead of owning a counter.
+
+### 3. PDU codec — `src/pdu.ts`
+
+- [ ] `pduToObj(buffer)` → `{ err?, pduObj? }`, `objToPdu(obj)` → `{ err?, buffer? }`,
+      `pduReturn(pdu, status?, params?, tlvs?)` → `{ err?, buffer? }`, `isResp(pduObj)`.
+- [ ] Keep the trailing-NULL-octet retry for `short_message` that 0.4.0 has — real peers send it.
+- [ ] Guard `cmdLength` against a maximum before allocating, so a hostile peer cannot ask for a 4 GiB
+      buffer. 0.4.0 has no such guard.
+- [ ] Per-command typed params: `pduToObj` returns a union discriminated on `cmdName`, and
+      `objToPdu` narrows `params` to the named command's fields.
+
+### 4. Session — `src/session.ts`
+
+- [ ] Framing off the socket. Replace 0.4.0's `Buffer.concat` per chunk with an accumulating reader —
+      concatenating the whole queue on every `data` event is quadratic.
+- [ ] Sequence numbers, wrapping at 2147483646.
+- [ ] `send()` with `responseTimeout`, `maxOutstanding` windowing and a queue, and `AbortSignal`.
+      Listeners must be removed on every exit path — timeout, abort and close included.
+- [ ] `sendReturn()`, `unbind()`, `close()`.
+- [ ] `submit_sm` handling, including long-SMS reassembly with `maxReassembly` and a real
+      `reassemblyTimeout` timer.
+- [ ] `deliver_sm` handling: prefer the TLVs, fall back to parsing the receipt text
+      (`id:… sub:001 dlvrd:1 submit date:… done date:… stat:DELIVRD err:0 text:…`).
+- [ ] Per-segment `dlr` plus merged `messageDlr`.
+- [ ] `enquire_link` and `unbind` handling.
+
+### 5. Sms handle — `src/sms.ts`
+
+- [ ] `sendResp(status?)` and `sendDlr(status?)` returning result DTOs.
+- [ ] Generated `message_id` values are UUID v7.
+- [ ] **Fix:** `sendDlr` emits the 7-character spec status (`UNDELIV`, not `UNDELIVERABLE`).
+
+### 6. Client and server — `src/client.ts`, `src/server.ts`
+
+- [ ] `client()` — bind by `bindType`, all bind fields optional with 0.4.0's defaults.
+- [ ] **Fix:** real TLS via `tls.connect()` / `tls.createServer()`, accepting an options object.
+- [ ] Opt-in reconnect with exponential backoff between `minDelay` and `maxDelay`, re-binding and
+      emitting `reconnected`. Decide and document what happens to in-flight sends across a reconnect.
+- [ ] `server()` — resolves once when listening, exposes `port`, `close()` and the `session` event.
+- [ ] `authenticate` hook; `userData` attached to the session.
+- [ ] `idleTimeout` drops silent peers.
+
+### 7. Public surface — `src/index.ts`
+
+- [ ] Named exports only, matching "The agreed API" above exactly.
+
+### 8. Tests
+
+Port the 0.4.0 suite (`test/01_encodings.js` … `test/04_session.js` on `master`) and extend it. Every
+defect in the AGENTS.md table needs a test that fails against 0.4.0 behaviour.
+
+- [ ] Encodings, wire types, PDU round-trips, return PDUs, message sizing and splitting.
+- [ ] Sessions: bind, auth success and failure, simple SMS, long SMS, DLRs, and the Kannel capture
+      with the large UDH from `test/04_session.js`.
+- [ ] **Interop:** add the reference `smpp` package (farhadi/node-smpp) as a dev dependency and assert
+      both directions — our encoder against its parser, its encoder against our parser. This is how
+      the wire-format fixes are validated; the maintainer asked specifically for proof that the
+      corrected framing is right rather than differently wrong.
+- [ ] Reassembly bounds, response timeouts, abort, and the send window.
+
+### 9. CI and release
+
+- [ ] `.github/workflows/test.yaml` — lint, typecheck and test on Node 18, 20, 22 and 24. The 18/20
+      legs need the tests compiled first, since type stripping needs Node 22.18+.
+- [ ] `.github/workflows/release.yaml` — `npm publish --provenance` on a `v*` tag.
+- [ ] `renovate.json`.
+- [ ] Delete nothing from `master`; this branch simply does not carry `.travis.yml`.
+
+### 10. Release chores
+
+- [ ] Fill in README usage docs as each part lands — right now the README documents the target API,
+      and it must not claim anything that is not implemented and tested.
+- [ ] `npm deprecate larvitsmpp` pointing at `@larvit/smpp` once 1.0.0 is published. Maintainer's
+      call to run it; not something CI should do.
+
+## Open questions
+
+None outstanding. Everything above was settled with the maintainer; anything genuinely new that comes
+up during implementation should be asked rather than assumed.
diff --git a/tsconfig.build.json b/tsconfig.build.json
new file mode 100644
index 0000000..1797c71
--- /dev/null
+++ b/tsconfig.build.json
@@ -0,0 +1,9 @@
+{
+	"extends": "./tsconfig.json",
+	"compilerOptions": {
+		"noEmit": false,
+		"outDir": "dist",
+		"rootDir": "src"
+	},
+	"include": ["src"]
+}
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..f4d9a10
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,27 @@
+{
+	"compilerOptions": {
+		"allowImportingTsExtensions": true,
+		"declaration": true,
+		"declarationMap": true,
+		"erasableSyntaxOnly": true,
+		"exactOptionalPropertyTypes": true,
+		"isolatedModules": true,
+		"lib": ["ES2023"],
+		"module": "nodenext",
+		"moduleResolution": "nodenext",
+		"noEmit": true,
+		"noFallthroughCasesInSwitch": true,
+		"noImplicitOverride": true,
+		"noImplicitReturns": true,
+		"noUnusedLocals": true,
+		"noUnusedParameters": true,
+		"rewriteRelativeImportExtensions": true,
+		"skipLibCheck": true,
+		"sourceMap": true,
+		"strict": true,
+		"target": "ES2023",
+		"types": ["node"],
+		"verbatimModuleSyntax": true
+	},
+	"include": ["eslint.config.ts", "src", "test"]
+}