example BLE micropython
example BLE micropython
Hello,
I am looking for sample program to send and received data over BLE in MicroPython for ESP32.
Thanks to help.
Regards.
julien
I am looking for sample program to send and received data over BLE in MicroPython for ESP32.
Thanks to help.
Regards.
julien
Re: example BLE micropython
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.
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")
Re: example BLE micropython
@HexVitor thnx for sharing, your code worked well for me!
One typo I found in the IRQ and share here for anyone to come by:
should be:
And I cannot figure out why is not recognizing the litteral string. If I add an else-statement, the latter is triggered.
Did you (or anybody else) find out about that?
Thnx again!
One typo I found in the IRQ and share here for anyone to come by:
Code: Select all
elif event == 4:
Code: Select all
elif event == 3:
Code: Select all
if received == 'blue_led':
Did you (or anybody else) find out about that?
Thnx again!
- pythoncoder
- Posts: 5956
- Joined: Fri Jul 18, 2014 8:01 am
- Location: UK
- Contact:
Re: example BLE micropython
The variable received is not set anywhere. The code
should throw an exception. Should it read
?
Code: Select all
if received == 'blue_led':
Code: Select all
if message == 'blue_led':
Peter Hinch
Index to my micropython libraries.
Index to my micropython libraries.
Re: example BLE micropython
Good and simple sample, @HexVitor. Easy to follow!
There are 3 bugs, however.
The last string compare put me off a little, until I realized the [:-1] stripping did not remove '\r' (aka carriage return). .strip() is a better way of removing blanks...
... should be ...
In addition, `led.value()` should be used in place of `blue_led.value()`
There are 3 bugs, however.
The last string compare put me off a little, until I realized the [:-1] stripping did not remove '\r' (aka carriage return). .strip() is a better way of removing blanks...
Code: Select all
elif event == 4:
...
if received == 'blue_led':
...
message = buffer.decode('UTF-8')[:-1]
Code: Select all
elif event == 3:
...
if message == 'blue_led':
...
message = buffer.decode('UTF-8').strip()
Re: example BLE micropython
thanks for the code, I do some modification here: https://github.com/2black0/MicroPython-ESP32-BLE
Re: example BLE micropython . what about passkey?
Is there any possibility to include a passkey to the BLE? I didn't find any hint to this point...
Sorry about my english - I'mnot used to write in this language..
best greetings, stepfl
Sorry about my english - I'mnot used to write in this language..
best greetings, stepfl
Re: example BLE micropython
Hi,
I need the same BLE Micropython code to send and receive data, but on a RP2040 Connect board with Mycropython installed..
Can anyone with the knowledge please help?
thx
I need the same BLE Micropython code to send and receive data, but on a RP2040 Connect board with Mycropython installed..
Can anyone with the knowledge please help?
thx
Re: example BLE micropython
Take a look at aioble. There are some examples there in the readme as well as in the examples directory. Feel free to ask more questions.
https://github.com/micropython/micropyt ... oth/aioble