Add node-transport lib (#703)

* feat: add node transport

* updated readme

* Update packages/transport-node/README.md

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

.gitignore

@@ -6,3 +6,4 @@ stats.html
 dev-dist
 __screenshots__*
 *.diff
+npm/

deno.json

@@ -3,6 +3,7 @@
     "./packages/web",
     "./packages/core",
     "./packages/transport-deno",
+    "./packages/transport-node",
     "./packages/transport-http",
     "./packages/transport-web-bluetooth",
     "./packages/transport-web-serial"

packages/transport-node/README.md

@@ -0,0 +1,28 @@
+# @meshtastic/transport-node
+
+[![JSR](https://jsr.io/badges/@meshtastic/transport-node)](https://jsr.io/@meshtastic/transport-node)
+[![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-node` Provides TCP transport (Node) for Meshtastic
+devices. Installation instructions are available at
+[JSR](https://jsr.io/@meshtastic/transport-node)
+[NPM](https://www.npmjs.com/package/@meshtastic/transport-node)
+
+## Usage
+
+```ts
+import { MeshDevice } from "@meshtastic/core";
+import { TransportNode } from "@meshtastic/transport-node";
+
+const transport = await TransportNode.create("10.10.0.57");
+const device = new MeshDevice(transport);
+```
+
+## Stats
+
+![Alt](https://repobeats.axiom.co/api/embed/5330641586e92a2ec84676fedb98f6d4a7b25d69.svg "Repobeats analytics image")

packages/transport-node/deno.json

@@ -0,0 +1,8 @@
+{
+  "name": "@meshtastic/transport-node",
+  "version": "0.0.1",
+  "description": "NodeJS-specific transport layer for Meshtastic web applications.",
+  "exports": {
+    ".": "./mod.ts"
+  }
+}

packages/transport-node/mod.ts

@@ -0,0 +1 @@
+export { TransportNode } from "./src/transport.ts";

packages/transport-node/src/transport.ts

@@ -0,0 +1,77 @@
+import { Utils } from "@meshtastic/core";
+import type { Types } from "@meshtastic/core";
+import { Socket } from "node:net";
+import { Readable, Writable } from "node:stream";
+
+export class TransportNode implements Types.Transport {
+  private readonly _toDevice: WritableStream<Uint8Array>;
+  private readonly _fromDevice: ReadableStream<Types.DeviceOutput>;
+
+  /**
+   * Creates and connects a new TransportNode instance.
+   * @param hostname - The IP address or hostname of the Meshtastic device.
+   * @param port - The port number for the TCP connection (defaults to 4403).
+   * @returns A promise that resolves with a connected TransportNode instance.
+   */
+  public static create(hostname: string, port = 4403): Promise<TransportNode> {
+    return new Promise((resolve, reject) => {
+      const socket = new Socket();
+
+      const onError = (err: Error) => {
+        socket.destroy();
+        reject(err);
+      };
+
+      socket.once("error", onError);
+
+      socket.connect(port, hostname, () => {
+        socket.removeListener("error", onError);
+        resolve(new TransportNode(socket));
+      });
+    });
+  }
+
+  /**
+   * Constructs a new TransportNode.
+   * @param connection - An active Node.js net.Socket connection.
+   */
+  constructor(connection: Socket) {
+    connection.on("error", (err) => {
+      console.error("Socket connection error:", err);
+    });
+
+    const fromDeviceSource = Readable.toWeb(connection) as ReadableStream<
+      Uint8Array
+    >;
+    this._fromDevice = fromDeviceSource.pipeThrough(Utils.fromDeviceStream());
+
+    // Stream for data going FROM the application TO the Meshtastic device.
+    const toDeviceTransform = new TransformStream<Uint8Array, Uint8Array>();
+    this._toDevice = toDeviceTransform.writable;
+
+    // The readable end of the transform is then piped to the Node.js socket.
+    // A similar assertion is needed here because `Writable.toWeb` also returns
+    // a generically typed stream (`WritableStream<any>`).
+    toDeviceTransform.readable.pipeTo(
+      Writable.toWeb(connection) as WritableStream<Uint8Array>,
+    )
+      .catch((err) => {
+        console.error("Error piping data to socket:", err);
+        connection.destroy(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;
+  }
+}