Adding connect, read and write

.gitignore

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+.DS_Store
+node_modules

package.json

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+{
+  "name": "p5.ble",
+  "version": "0.0.1",
+  "description": "A p5.js library that enables communication between BLE devices and a p5 sketch.",
+  "main": "src/index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/yining1023/p5.ble.js.git"
+  },
+  "keywords": [
+    "p5js",
+    "ble"
+  ],
+  "author": "Yining Shi <[email protected]> (https://1023.io/)",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/yining1023/p5.ble.js/issues"
+  },
+  "homepage": "https://github.com/yining1023/p5.ble.js#readme"
+}

src/index.js

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+const connect = (serviceUuid, callback) => {
+  const options = {
+    filters: [{
+      services: [serviceUuid]
+    }]
+  };
+
+  console.log('Requesting Bluetooth Device...');
+
+  return navigator.bluetooth.requestDevice(options)
+  .then(device => {
+    console.log(`Got device ${device.name}`);
+    return device.gatt.connect();
+  })
+  .then(server => {
+    console.log('Getting Service...');
+    return server.getPrimaryService(serviceUuid);
+  })
+  .then(service => {
+    console.log('Getting Characteristics...');
+    return service.getCharacteristics();
+  })
+  .then(characteristics => {
+    console.log('Got Characteristic');
+    callback(null, characteristics);
+  })
+  .catch(error => {
+    console.log(`Error: ${error}`);
+    callback(error);
+  });
+}
+
+const read = async (characteristic, callback) => {
+  const value = await characteristic.readValue();
+  return callback(null, value.getUint8(0));
+}
+
+const write = (characteristic, inputValue) => {
+  let bufferToSend = Uint8Array.of(inputValue);
+  characteristic.writeValue(bufferToSend);
+  console.log(`Writing ${inputValue} to Characteristic...`);
+}
+
+module.exports = {
+  connect,
+  read,
+  write
+}