This is the bluetooth part based on https://github.com/ITPNYU/p5.ble.js/tree/master/examples/BluefruitLE this example

*/

​

// Copyright (c) 2018 p5ble

//

// This software is released under the MIT License.

// https://opensource.org/licenses/MIT

​

// The serviceUuid must match the serviceUuid of the device you would like to connect

​

const serviceUuid = "6e400001-b5a3-f393-e0a9-e50e24dcca9e";

const txCharacteristic = "6e400002-b5a3-f393-e0a9-e50e24dcca9e"; // transmit is from the phone's perspective

const rxCharacteristic = "6e400003-b5a3-f393-e0a9-e50e24dcca9e";  // receive is from the phone's perspective

​

let myCharacteristic;

let myBLE;

let receiveText;

function bleSetup(){

  myBLE = new p5ble();

  createElement("br");

​

  // Create a 'Connect and Start Notifications' button

  const connectButton = createButton('Connect')

  connectButton.mousePressed(connectAndStartNotify);

  connectButton.style("width: 100%; height: 100px; fontSize: 30pt;")

  createElement("br");

  // Create a 'Stop Notifications' button

  const stopButton = createButton('Stop')

  stopButton.style("width: 100%; height: 100px; fontSize: 30pt;")

  stopButton.mousePressed(stopNotifications);

    createElement("br");

​

  receiveText = createElement('textarea', '').id("receiveText");

  receiveText.style("width: 100%; height: 100px; ")

}

​

​

​

function connectAndStartNotify() {

  // Connect to a device by passing the service UUID

  myBLE.connect(serviceUuid, gotCharacteristics);

}

​

// A function that will be called once got characteristics

function gotCharacteristics(error, characteristics) {

  if (error) console.log('error: ', error);

  for(let i = 0; i < characteristics.length; i++){

   if(rxCharacteristic ==characteristics[i].uuid){

    myCharacteristic = characteristics[i];

    myBLE.startNotifications(myCharacteristic, handleNotifications,'string');

   } 

  }

  // Start notifications on the first characteristic by passing the characteristic

  // And a callback function to handle notifications

  //myBLE.startNotifications(myCharacteristic, handleNotifications);

  // You can also pass in the dataType

  // Options: 'unit8', 'uint16', 'uint32', 'int8', 'int16', 'int32', 'float32', 'float64', 'string'

  // myBLE.startNotifications(myCharacteristic, handleNotifications, 'string');

}

​

// A function that will be called once got characteristics

function handleNotifications(data) {

  let receiveText = document.getElementById("receiveText");

  receiveText.value += data;

  receiveText.scrollTop = receiveText.scrollHeight;

  if (data === "\n"){

    handleLineBreak(receiveText.value);

    receiveText.value = "";

  }

}

​

// A function to stop notifications

function stopNotifications() {

  myBLE.stopNotifications(myCharacteristic);

}