Noob question: how to send data through bluetooth

[Francesco Pasculli]

Hi everyone, I would like to transmit light intensity measurement through bluetooth but I cannot understand how to do this since I'm a pycom noob and it is not very clear to me the mechanism, I think I lack some basics concepts.
After some attemps I was able to connect to my phone and discover my Fipy using BLE Scanner app but I don't know how to continue.

This is my code at the moment

from network import Bluetooth
import ubinascii
import time
import pycom
from pycoproc_2 import Pycoproc
import machine
from LTR329ALS01 import LTR329ALS01


pycom.heartbeat(False)
pycom.rgbled(0x0A0A08) # white

py = Pycoproc()

pybytes_enabled = False
if 'pybytes' in globals():
    if(pybytes.isconnected()):
        print('Pybytes is connected, sending signals to Pybytes')
        pybytes_enabled = True

lt = LTR329ALS01(py)

bt = Bluetooth()
bt.set_advertisement(name='FraccaPy', service_uuid=b'1234567890123456')
bt.advertise(True)

if not bt.isscanning():
    bt.start_scan(-1)    # start scanning with no timeout


print('Trying to establish connection with Nord')
connection = bt.connect('ac5fea133f19')

if (connection.isconnected()):
    print ('Successfully connected to Nord')

# while True:
#     time.sleep(1)
#     # print read data on screen
#     print("Light [channel Blue lux, channel Red lux]: " + str(lt.light()))
#     # switch on led graduated in relation to external light
#     red = lt.light()[1]*0.5
#     blue = lt.light()[0]*0.5
#     led = round (red + blue)
#     pycom.rgbled(led << 8)
#     # transmit data via Wi-Fi
#     if(pybytes_enabled):
#         pybytes.send_signal(1, lt.light())

Any help would be greatly appreciated, thanks in advance.

[Francesco Pasculli]

@Gijs actually I solved my problem before seeing this , anyway it is very interesting.
In particular, my problem was solved by removing

if not bt.isscanning():
    bt.start_scan(-1)    # start scanning with no timeout


print('Trying to establish connection with Nord')
connection = bt.connect('ac5fea133f19')

I found out these commands were not needed and they broke my code.

[Gijs]

We recently provided an example for this here: https://docs.pycom.io/tutorials/networks/ble/callback/
Let me know if that works for you