Initial Node.js serial transport (#779)

* Initial Node.js serial transport

* Minor doc fixes

* Add serialport to lockfile

* Typo fix

* Fix link:

packages/transport-node-serial/README.md

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+# @meshtastic/transport-node-serial
+
+[![JSR](https://jsr.io/badges/@meshtastic/transport-node-serial)](https://jsr.io/@meshtastic/transport-node-serial)
+[![CI](https://img.shields.io/github/actions/workflow/status/meshtastic/js/ci.yml?branch=master&label=actions&logo=github&color=yellow)](https://github.com/meshtastic/js/actions/workflows/ci.yml)
+[![CLA assistant](https://cla-assistant.io/readme/badge/meshtastic/meshtastic.js)](https://cla-assistant.io/meshtastic/meshtastic.js)
+[![Fiscal Contributors](https://opencollective.com/meshtastic/tiers/badge.svg?label=Fiscal%20Contributors&color=deeppink)](https://opencollective.com/meshtastic/)
+[![Vercel](https://img.shields.io/static/v1?label=Powered%20by&message=Vercel&style=flat&logo=vercel&color=000000)](https://vercel.com?utm_source=meshtastic&utm_campaign=oss)
+
+## Overview
+
+`@meshtastic/transport-noden-node` Provides Serial transport (Node) for Meshtastic
+devices. Installation instructions are available at
+[JSR](https://jsr.io/@meshtastic/transport-node-serial)
+[NPM](https://www.npmjs.com/package/@meshtastic/transport-node-serial)
+
+## Usage
+
+```ts
+import { MeshDevice } from "@meshtastic/core";
+import { TransportNodeSerial } from "@meshtastic/transport-node-serial";
+
+const transport = await TransportNodeSerial.create("/dev/cu.usbserial-0001");
+const device = new MeshDevice(transport);
+```
+
+## Stats
+
+![Alt](https://repobeats.axiom.co/api/embed/5330641586e92a2ec84676fedb98f6d4a7b25d69.svg "Repobeats analytics image")

packages/transport-node-serial/mod.ts

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+export { TransportNodeSerial } from "./src/transport.ts";

packages/transport-node-serial/package.json

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+{
+  "name": "@meshtastic/transport-node-serial",
+  "version": "0.0.1",
+  "description": "NodeJS-specific serial transport layer for Meshtastic web applications.",
+  "exports": {
+    ".": "./dist/mod.mjs"
+  },
+  "main": "./dist/mod.mjs",       
+  "module": "./dist/mod.mjs",     
+  "types": "./dist/mod.d.mts",    
+   
+  "license": "GPL-3.0-only",
+  "tsdown": {
+    "entry": "mod.ts",
+    "dts": true,
+    "format": ["esm"],
+    "splitting": false,
+    "clean": true
+  },
+  "files": [
+    "package.json",
+    "README.md",
+    "LICENSE",
+    "dist"
+  ],
+  "scripts": {
+  "preinstall": "npx only-allow pnpm",
+    "prepack": "cp ../../LICENSE ./LICENSE",
+    "clean": "rm -rf dist LICENSE",
+    "build:npm": "tsdown",
+    "publish:npm": "pnpm clean && pnpm build:npm && pnpm publish --access public",
+    "prepare:jsr": "rm -rf dist && pnpm dlx pkg-to-jsr",
+    "publish:jsr": "pnpm run prepack && pnpm prepare:jsr && deno publish --allow-dirty --no-check"
+  },
+  "dependencies": {
+    "@meshtastic/core": "workspace:*",
+    "serialport": "^13.0.0"
+  }
+}

packages/transport-node-serial/src/transport.ts

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+import { Readable, Writable } from "node:stream";
+import type { Types } from "@meshtastic/core";
+import { Utils } from "@meshtastic/core";
+import { SerialPort } from "serialport";
+
+export class TransportNodeSerial implements Types.Transport {
+  private readonly _toDevice: WritableStream<Uint8Array>;
+  private readonly _fromDevice: ReadableStream<Types.DeviceOutput>;
+  private port: SerialPort | undefined;
+
+  /**
+   * Creates and connects a new TransportNode instance.
+   * @param path - Path to the serial device
+   * @param baudRate - The port number for the TCP connection (defaults to 4403).
+   * @returns A promise that resolves with a connected TransportNode instance.
+   */
+  public static create(path: string, baudRate = 115200): Promise<TransportNodeSerial> {
+    return new Promise((resolve, reject) => {
+      const port = new SerialPort({
+        path,
+        baudRate,
+        autoOpen: true,
+      });
+
+      const onError = (err: Error) => {
+        port.close();
+        reject(err);
+      };
+
+      port.once("error", onError);
+      port.on("open", () => {
+        port.removeListener("error", onError);
+        resolve(new TransportNodeSerial(port));
+      });
+    });
+  }
+
+  /**
+   * Constructs a new TransportNode.
+   * @param port - An active Node.js SerialPort connection.
+   */
+  constructor(port: SerialPort) {
+    this.port = port;
+    this.port.on("error", (err) => {
+      console.error("Serial port connection error:", err);
+    });
+
+    const fromDeviceSource = Readable.toWeb(
+      port,
+    ) as ReadableStream<Uint8Array>;
+    this._fromDevice = fromDeviceSource.pipeThrough(Utils.fromDeviceStream());
+
+    // Stream for data going FROM the application TO the Meshtastic device.
+    const toDeviceTransform = Utils.toDeviceStream;
+    this._toDevice = toDeviceTransform.writable;
+
+    // The readable end of the transform is then piped to the Node.js SerialPort connection.
+    // A similar assertion is needed here because `Writable.toWeb` also returns
+    // a generically typed stream (`WritableStream<any>`).
+    toDeviceTransform.readable
+      .pipeTo(Writable.toWeb(port) as WritableStream<Uint8Array>)
+      .catch((err) => {
+        console.error("Error piping data to serial port:", err);
+        this.port.close(err as Error);
+      });
+  }
+
+  /**
+   * The WritableStream to send data to the Meshtastic device.
+   */
+  public get toDevice(): WritableStream<Uint8Array> {
+    return this._toDevice;
+  }
+
+  /**
+   * The ReadableStream to receive data from the Meshtastic device.
+   */
+  public get fromDevice(): ReadableStream<Types.DeviceOutput> {
+    return this._fromDevice;
+  }
+
+  disconnect() {
+    this.port.close();
+    this.port = undefined;
+    return Promise.resolve();
+  }
+}

packages/transport-node-serial/tsconfig.json

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+  {
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "module": "ESNext",
+    "target": "ES2020",
+    "declaration": true,
+    "outDir": "./dist",
+    "moduleResolution": "bundler",
+    "emitDeclarationOnly": false,
+    "esModuleInterop": true,
+  },
+  "include": ["src"]
+}
+
+
+
+
+