{"id":608,"date":"2024-03-23T16:01:00","date_gmt":"2024-03-23T16:01:00","guid":{"rendered":"https:\/\/www.bleuio.com\/blog\/?p=608"},"modified":"2024-03-24T16:14:00","modified_gmt":"2024-03-24T16:14:00","slug":"interfacing-bleuio-with-node-js-using-serial-communication","status":"publish","type":"post","link":"https:\/\/www.bleuio.com\/blog\/interfacing-bleuio-with-node-js-using-serial-communication\/","title":{"rendered":"Interfacing BleuIO with Node.js Using Serial Communication"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">In this tutorial, we&#8217;ll explore how to utilize BleuIO, a Bluetooth Low Energy (BLE) USB dongle, with Node.js for BLE application development. We&#8217;ll use the <code>serialport<\/code> library to communicate with BleuIO, enabling us to send AT commands and interact with BLE devices.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Prerequisites<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Before we begin, ensure you have the following:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.bleuio.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">BleuIO Bluetooth Low Energy USB dongle.<\/a><\/li>\n\n\n\n<li>Node.js installed on your system.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Setting Up the Project<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Project Structure<\/strong>: Create a new directory for your project. Inside this directory, create the following files:\n<ul class=\"wp-block-list\">\n<li><code>index.html<\/code>: HTML file for the frontend (optional).<\/li>\n\n\n\n<li><code>server.js<\/code>: Node.js backend server.<\/li>\n\n\n\n<li><code>package.json<\/code>: Node.js package configuration file.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Initialize Node.js Project<\/strong>: Initialize a new Node.js project and install necessary dependencies.<\/li>\n<\/ol>\n\n\n\n<pre class=\"wp-block-code\"><code>mkdir bleuio-node-serial\ncd bleuio-node-serial\nnpm init -y\nnpm install express serialport\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Writing the Code<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Let&#8217;s write the code for each component:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Node.js Backend (<code>server.js<\/code>)<\/strong>: This file sets up an Express server to serve the HTML file and handles BLE interactions using BleuIO and <code>serialport<\/code>.<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ server.js\nconst express = require('express');\nconst { SerialPort } = require('serialport');\n\nconst app = express();\nconst port = 3000;\n\n\/\/ Serve the HTML file (optional)\napp.get('\/', (req, res) => {\n  res.sendFile(__dirname + '\/index.html');\n});\n\n\/\/ Endpoint to scan for BLE devices using BleuIO\napp.get('\/scanbledevice', (req, res) => {\n  \/\/ Replace the following code with your BLE scanning logic\n  const bleDevices = &#91;'Device 1', 'Device 2', 'Device 3'];\n  res.json(bleDevices);\n});\n\n\/\/ Start the server\napp.listen(port, () => {\n  console.log(`Server is running on http:\/\/localhost:${port}`);\n});\n<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>BLE Scanning Logic<\/strong>: Implement BLE scanning logic using BleuIO and <code>serialport<\/code> in the server file (<code>server.js<\/code>). This module contains the function to scan for BLE devices using BleuIO.<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ scanble.js\nconst { SerialPort } = require('serialport');\n\nfunction scanBLE() {\n  return new Promise((resolve, reject) => {\n    \/\/ Use SerialPort to list available ports\n    SerialPort.list()\n      .then((ports) => {\n        \/\/ Filter ports to find BleuIO device\n        const blePorts = ports.filter((port) =>\n          port.manufacturer.includes('Smart Sensor Devices')\n        );\n\n        if (blePorts.length === 0) {\n          reject(new Error('BleuIO device not found'));\n        }\n\n        \/\/ Connect to the first found BleuIO device\n        const blePort = new SerialPort({\n          path: blePorts&#91;0].path,\n          baudRate: 115200\n        });\n\n        \/\/ Perform BLE scan\n        blePort.write('AT+CENTRAL\\r', (err) => {\n          if (err) {\n            reject(new Error('Error setting central role: ' + err.message));\n          } else {\n            blePort.write('AT+GAPSCAN=3\\r', (err) => {\n              if (err) {\n                reject(new Error('Error initiating scan: ' + err.message));\n              } else {\n                setTimeout(() => {\n                  \/\/ Read and parse scan results\n                  const scanResults = blePort.read();\n                  resolve(scanResults.split('\\n'));\n                }, 3500);\n              }\n            });\n          }\n        });\n      })\n      .catch((err) => {\n        reject(new Error('Error listing serial ports: ' + err.message));\n      });\n  });\n}\n\nmodule.exports = { scanBLE };\n<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>HTML Frontend (<code>index.html<\/code>)<\/strong>: This file provides a user interface (UI) to trigger BLE device scanning and display the results.<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- index.html -->\n&lt;!DOCTYPE html>\n&lt;html lang=\"en\">\n  &lt;head>\n    &lt;!-- Include necessary meta tags and stylesheets -->\n    &lt;title>Scan BLE Device&lt;\/title>\n  &lt;\/head>\n  &lt;body>\n    &lt;div class=\"container\">\n      &lt;br \/>\n      &lt;br \/>\n      &lt;button class=\"btn btn-success\" id=\"scanBtn\">Scan for Devices&lt;\/button>\n      &lt;div id=\"listScan\">&lt;\/div>\n    &lt;\/div>\n\n    &lt;!-- Include JavaScript for button click event -->\n    &lt;script>\n      \/\/ JavaScript to handle button click event\n    &lt;\/script>\n  &lt;\/body>\n&lt;\/html>\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Running the Application<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ensure your BleuIO dongle is connected to your computer.<\/li>\n\n\n\n<li>Run the Node.js server<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>npm start<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Open your web browser and navigate to <code>http:\/\/localhost:3000<\/code>.<\/li>\n\n\n\n<li>Click the &#8220;Scan for Devices&#8221; button.<\/li>\n\n\n\n<li>The list of nearby BLE devices will be displayed on the web page.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Output<\/h3>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"784\" src=\"https:\/\/www.bleuio.com\/blog\/wp-content\/uploads\/2024\/03\/image-1024x784.png\" alt=\"\" class=\"wp-image-609\" srcset=\"https:\/\/www.bleuio.com\/blog\/wp-content\/uploads\/2024\/03\/image-1024x784.png 1024w, https:\/\/www.bleuio.com\/blog\/wp-content\/uploads\/2024\/03\/image-300x230.png 300w, https:\/\/www.bleuio.com\/blog\/wp-content\/uploads\/2024\/03\/image-768x588.png 768w, https:\/\/www.bleuio.com\/blog\/wp-content\/uploads\/2024\/03\/image.png 1184w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">In this tutorial, we&#8217;ve explored how to use BleuIO with Node.js via serial communication using the <code>serialport<\/code> library. You can extend this project by integrating more BLE functionalities and building a robust BLE application.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Feel free to customize and expand upon this project according to your requirements and explore the vast possibilities of BLE application development with Node.js and BleuIO!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In this tutorial, we&#8217;ll explore how to utilize BleuIO, a Bluetooth Low Energy (BLE) USB dongle, with Node.js for BLE application development. We&#8217;ll use the serialport library to communicate with BleuIO, enabling us to send AT commands and interact with BLE devices. Prerequisites Before we begin, ensure you have the following: Setting Up the Project [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":610,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,2],"tags":[],"class_list":["post-608","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bleuio","category-bleuio-tutorial"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Interfacing BleuIO with Node.js Using Serial Communication - BleuIO - Create Bluetooth Low Energy application<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.bleuio.com\/blog\/interfacing-bleuio-with-node-js-using-serial-communication\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Interfacing BleuIO with Node.js Using Serial Communication - BleuIO - Create Bluetooth Low Energy application\" \/>\n<meta property=\"og:description\" content=\"In this tutorial, we&#8217;ll explore how to utilize BleuIO, a Bluetooth Low Energy (BLE) USB dongle, with Node.js for BLE application development. 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