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Adding an example of how to watch a serial port using Event Emitters and So… #4044

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18 changes: 18 additions & 0 deletions examples/serial-port/client.ts
Original file line number Diff line number Diff line change
@@ -0,0 +1,18 @@
import { io } from "socket.io-client";

const socket = io("ws://localhost:8080/", {});

socket.on("connect", () => {
console.log(`connect ${socket.id}`);
});

socket.on("disconnect", () => {
console.log(`disconnect`);
});

socket.on("onDeviceDisconnected", () => {
console.log(`onDeviceDisconnected`);
});
socket.on("onDeviceConnected", () => {
console.log(`onDeviceConnected`);
});
20 changes: 20 additions & 0 deletions examples/serial-port/package.json
Original file line number Diff line number Diff line change
@@ -0,0 +1,20 @@
{
"name": "typescript-example",
"version": "1.0.0",
"description": "An example with TypeScript",
"private": true,
"scripts": {
"build": "tsc",
"start:server": "ts-node server.ts",
"start:client": "ts-node client.ts"
},
"author": "Damien Arrachequesne",
"license": "MIT",
"dependencies": {
"serialport": "^9.2.0",
"socket.io": "^4.0.0",
"socket.io-client": "^4.0.0",
"ts-node": "^9.0.0",
"typescript": "^4.0.5"
}
}
87 changes: 87 additions & 0 deletions examples/serial-port/server.ts
Original file line number Diff line number Diff line change
@@ -0,0 +1,87 @@
import { Server } from "socket.io";
const SerialPort = require("serialport");
const Readline = require("@serialport/parser-readline");
const emitter = require("events").EventEmitter;

const em = new emitter();
const deviceName = "/dev/tty.usbserial-0001";

const io = new Server(8080);

let found = false;

function findDevice() {
console.log("findDevice");
SerialPort.list()
.then(function (ports) {
// // iterate through ports
for (var i = 0; i < ports.length; i += 1) {
console.log("list", ports[i]);
if (ports[i].path === deviceName) {
console.log("device founded");
found = true;
em.emit("connected");
startDevice();
return;
}
}
if (!found) {
setTimeout(findDevice, 1000);
}
})
.catch(function (error) {
console.log("error on read port", error);
});
}

function startDevice() {
try {
const port = new SerialPort(deviceName, { baudRate: 9600 });
const parser = port.pipe(new Readline({ delimiter: "\n" })); // Read the port data

port.on("open", () => {
console.log("serial port open");
});

parser.on("data", (data) => {
console.log("got word from arduino:", data);
em.emit("onDataReceived", data);
});

port.on("close", function (err) {
console.log("Port closed."), err;
found = false;
em.emit("disconnect");
setTimeout(findDevice, 1000);
});
} catch (e) {
console.log("device not found ");
}
}

io.on("connect", (socket) => {
console.log(`connect ${socket.id}`);

if (found) {
socket.emit("onDeviceConnected");
} else {
socket.emit("onDeviceDisconnected");
}

em.on("disconnect", function (data) {
socket.emit("onDeviceDisconnected");
});
em.on("connected", function (data) {
socket.emit("onDeviceConnected");
});
em.on("onDataReceived", function (data) {
socket.emit("onDataReceived", data);
});

socket.on("disconnect", () => {
console.log(`disconnect ${socket.id}`);
});
});

console.log("start program");
findDevice();
9 changes: 9 additions & 0 deletions examples/serial-port/tsconfig.json
Original file line number Diff line number Diff line change
@@ -0,0 +1,9 @@
{
"compilerOptions": {
"module": "commonjs",
"target": "es5"
},
"exclude": [
"node_modules"
]
}