Hi, I am developing a code and it is like that at the moment. To use it, just have a serial communication application via BLE on the smartphone (I use the Serial Bluetooth Terminal).
Serial Bluetooth Terminal:
https://play.google.com/store/apps/deta ... l&hl=pt_BR
Settings (App):
1. Terminal: Font size(14), Font style(Normal), Charset(UTF-8), Display mode(Text), Auto scroll(on),
Show connection messages(on), Show timestamps(on), Timestamp(I left default), Buffer size(10 kB).
2. Receive:
Newline(LF).
3. Send:
Newline(LF), Edit mode(Text), Line delay(0 ms), Character delay(0 ms), Local echo(on), Clear input(on).
4. Misc(I left default).
MCU: ESP-WROOM-32 (ESP32D0WDQ6)
Firmware: MicroPython v1.12 (for ESP32 with IDF4, 2019.12.20)
https://micropython.org/resources/firmw ... -v1.12.bin
IDE: Thonny Python IDE
SO: Windows 10 Home Single Language 2004
Use
ble.send ("<message>") to send messages to the smartphone.
Messages sent to ESP32 are displayed on the terminal.
Blinking blue LED indicates that BLE communication is available.
Code: Select all
from machine import Pin, Timer
from time import sleep_ms
import ubluetooth
from esp32 import raw_temperature
class BLE():
def __init__(self, name):
self.name = name
self.ble = ubluetooth.BLE()
self.ble.active(True)
self.led = Pin(2, Pin.OUT)
self.timer1 = Timer(0)
self.timer2 = Timer(1)
self.disconnected()
self.ble.irq(self.ble_irq)
self.register()
self.advertiser()
def connected(self):
self.timer1.deinit()
self.timer2.deinit()
def disconnected(self):
self.timer1.init(period=1000, mode=Timer.PERIODIC, callback=lambda t: self.led(1))
sleep_ms(200)
self.timer2.init(period=1000, mode=Timer.PERIODIC, callback=lambda t: self.led(0))
def ble_irq(self, event, data):
if event == 1:
'''Central disconnected'''
self.connected()
self.led(1)
elif event == 2:
'''Central disconnected'''
self.advertiser()
self.disconnected()
elif event == 4:
'''New message received'''
buffer = self.ble.gatts_read(self.rx)
message = buffer.decode('UTF-8')[:-1]
print(message)
if received == 'blue_led':
blue_led.value(not blue_led.value())
def register(self):
# Nordic UART Service (NUS)
NUS_UUID = '6E400001-B5A3-F393-E0A9-E50E24DCCA9E'
RX_UUID = '6E400002-B5A3-F393-E0A9-E50E24DCCA9E'
TX_UUID = '6E400003-B5A3-F393-E0A9-E50E24DCCA9E'
BLE_NUS = ubluetooth.UUID(NUS_UUID)
BLE_RX = (ubluetooth.UUID(RX_UUID), ubluetooth.FLAG_WRITE)
BLE_TX = (ubluetooth.UUID(TX_UUID), ubluetooth.FLAG_NOTIFY)
BLE_UART = (BLE_NUS, (BLE_TX, BLE_RX,))
SERVICES = (BLE_UART, )
((self.tx, self.rx,), ) = self.ble.gatts_register_services(SERVICES)
def send(self, data):
self.ble.gatts_notify(0, self.tx, data + '\n')
def advertiser(self):
name = bytes(self.name, 'UTF-8')
self.ble.gap_advertise(100, bytearray('\x02\x01\x02') + bytearray((len(name) + 1, 0x09)) + name)
# test
blue_led = Pin(2, Pin.OUT)
ble = BLE("ESP32")