Web BLE detect

nRF52 bluefruit adafruit BLE

Pre-requisites

Can I Use Web BLE?

Connect to a BLE device with a given device name and display some device info in the Chrome browser console.

Ensure the browser side of the code is also implemented with web-ble-detect.html.

<form>
  <button>Connect with BLE device</button>
</form>

<script>
  var deviceName = 'Palm'

  function isWebBluetoothEnabled() {
    if (!navigator.bluetooth) {
      console.log('Web Bluetooth API is not available in this browser!')
      return false
    }

    return true
  }

  function getDeviceInfo() {
    let options = {
      // acceptAllDevices: true // Option to accept all devices
      "filters": [
        { "name": deviceName }
      ]
    }

    console.log('Requesting Bluetooth Device...')
    navigator.bluetooth.requestDevice(options).then(device => {
      console.log('> Name: ' + device.name)
    }).catch(error => {
      console.log('Argh! ' + error)
    })
  }

  document.querySelector('form').addEventListener('submit', function(event) {
    event.stopPropagation()
    event.preventDefault()

    if (isWebBluetoothEnabled()) {
      getDeviceInfo()
    }
  })
</script>

Code

Download code

#include <bluefruit.h>

void setup() {
  Serial.begin(115200);
  delay(500);
  Serial.println("Start!");

  Bluefruit.begin();
  Bluefruit.setName("Palm");

  startAdv();
}

void loop() { }

void startAdv(void) {
  Bluefruit.Advertising.addFlags(BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE);
  Bluefruit.Advertising.addTxPower();
  Bluefruit.Advertising.addName();
  Bluefruit.Advertising.restartOnDisconnect(true);
  Bluefruit.Advertising.setInterval(32, 244);
  Bluefruit.Advertising.setFastTimeout(30);
  Bluefruit.Advertising.start(0);
}

Makefile

BOARD?=adafruit:nrf52:feather52832
PORT?=/dev/tty.SLAB_USBtoUART

.PHONY: default lint all flash clean

default: lint all flash clean

lint:
	cpplint --extensions=ino --filter=-legal/copyright *.ino

all:
	arduino-cli compile --fqbn $(BOARD) ./

flash:
	adafruit-nrfutil dfu genpkg --dev-type 0x0052 --application ./.*.hex dfu-package.zip
	adafruit-nrfutil dfu serial --package dfu-package.zip -p $(PORT) -b 115200

clean:
	rm -f .*.elf
	rm -f .*.hex
	rm -f *.zip

serve:
	echo "Open Chrome browser at http://localhost:8000/web-ble-detect.html"
	python -m SimpleHTTPServer 8000

Browser console

Open the browser developer console.

Serial console

Serial output from the firmware.