Send data from WiPy to LoPy with BLE

[amartinez]

Hi,

I' m trying to send data (I just need to send a temperature value) via BLE from WiPy to LoPy with the example posted on the offical documentation.

The boards connects properly, but when the Client tries to get the services list (services = conn.services()) it doesn't succeed.

LoPy (Client):

from network import Bluetooth
import time
bt = Bluetooth()
bt.start_scan(-1)

while True:
  adv = bt.get_adv()
  if adv and bt.resolve_adv_data(adv.data, Bluetooth.ADV_NAME_CMPL) == 'WiPy':
      try:
          conn = bt.connect(adv.mac)
          services = conn.services()
          print(services)
          for service in services:
              print(service.uuid())
              time.sleep(0.050)
              if type(service.uuid()) == bytes:
                  print('Reading chars from service = {}'.format(service.uuid()))
              else:
                  print('Reading chars from service = %x' % service.uuid())
              chars = service.characteristics()
              for char in chars:
                  if (char.properties() & Bluetooth.PROP_READ):
                      print('char {} value = {}'.format(char.uuid(), char.read()))
          conn.disconnect()
          break
      except:
          print("Error while connecting or reading from the BLE device")
          break
  else:
      time.sleep(0.050)

WiPy (Server):

from network import Bluetooth
import pycom

pycom.heartbeat(False)
bluetooth = Bluetooth()
bluetooth.set_advertisement(name='WiPy', service_uuid=b'1234567890123456')

def conn_cb (bt_o):
    events = bt_o.events()
    if  events & Bluetooth.CLIENT_CONNECTED:
        print("Client connected")
        pycom.rgbled(0x007f00) # green
    elif events & Bluetooth.CLIENT_DISCONNECTED:
        print("Client disconnected")
        pycom.rgbled(0x7f0000) # red

bluetooth.callback(trigger=Bluetooth.CLIENT_CONNECTED | Bluetooth.CLIENT_DISCONNECTED, handler=conn_cb)

bluetooth.advertise(True)

srv1 = bluetooth.service(uuid=b'1234567890123456', isprimary=True)

chr1 = srv1.characteristic(uuid=b'ab34567890123456', value=5)

char1_read_counter = 0
def char1_cb_handler(chr):
    global char1_read_counter
    char1_read_counter += 1

    events = chr.events()
    if  events & Bluetooth.CHAR_WRITE_EVENT:
        print("Write request with value = {}".format(chr.value()))
    else:
        if char1_read_counter < 3:
            print('Read request on char 1')
        else:
            return 'ABC DEF'

char1_cb = chr1.callback(trigger=Bluetooth.CHAR_WRITE_EVENT | Bluetooth.CHAR_READ_EVENT, handler=char1_cb_handler)

srv2 = bluetooth.service(uuid=1234, isprimary=True)

chr2 = srv2.characteristic(uuid=4567, value=0x1234)
char2_read_counter = 0xF0
def char2_cb_handler(chr):
    global char2_read_counter
    char2_read_counter += 1
    if char2_read_counter > 0xF1:
        return char2_read_counter

char2_cb = chr2.callback(trigger=Bluetooth.CHAR_READ_EVENT, handler=char2_cb_handler)

[livius]

@amartinez
Will be better if you post textual data not images
to post code you can surround it by triple ```
link to other possible formatting
http://commonmark.org/help/

[amartinez]

@livius done, sorry.

[amartinez]

I've updated the WiPy (Server) code with Alex's help, but it still not working.

from network import Bluetooth
import pycom

pycom.heartbeat(False)
bluetooth = Bluetooth()
bluetooth.set_advertisement(name='WiPy', service_uuid=b'1234567890123456')
pycom.rgbled(0x00007f)  # Blue

def conn_cb(bt_o):
    events = bt_o.events()
    if  events & Bluetooth.CLIENT_CONNECTED:
        print("Client connected")
        pycom.rgbled(0x007f00) # green
    elif events & Bluetooth.CLIENT_DISCONNECTED:
        print("Client disconnected")
        pycom.rgbled(0x7f0000) # red

bluetooth.callback(trigger=Bluetooth.CLIENT_CONNECTED | Bluetooth.CLIENT_DISCONNECTED, handler=conn_cb)

bluetooth.advertise(True)

srv1 = bluetooth.service(uuid=b'1234567890123456', isprimary=True)
char1 = srv1.characteristic(uuid=b'ab34567890123456', value=25)

temperature = 27   #Temperature value
char1.value(temperature)

srv1.start()

[bucknall]

Hi @amartinez,

I've been testing this out this morning and it appears to be a bug in the connecting device code - I've just been speaking with Daniel and he's going to debug it today. I'll keep you in the loop and you can see the github issue here - https://github.com/pycom/pycom-micropython-sigfox/issues/15.

[amartinez]

@bucknall Thank you so much! I' m a bit desesperated with this!

[Nagarjuna Reddy]

@amartinez
hi
i have same problem like
services=conn.services() is not started how to solve if you get a answer.

[st3ty]

@nagarjuna-reddy same here