Advertising data from 1 lopy, trying to read from another one

[Morthen]

High,

I want to communicate using bluetooth from one LoPy to another, one LoPy is the GATT server and the other one is the Central device. Problem is I can't connect my Central Device to my Gatt server.

• list item
  Here is the GATT server code :

And here is the Central device code :

And here is the Central device console :

I don't know why but the creation of the GATT service object isn't working.

Any suggestion?

[Morthen]

High,

Can I have some news about my issue?
I don't know how to solve it !

[Morthen]

This is a classic example of GATT server code and central device code

/******************************************/
Here is the GATT server code fro the first lopy :

from network import Bluetooth

bluetooth = Bluetooth()
bluetooth.set_advertisement(name='LoPy', service_uuid=b'1234567890123456')

def conn_cb (bt_o):
    events = bt_o.events()
    if  events & Bluetooth.CLIENT_CONNECTED:
	print("Client connected")
    elif events & Bluetooth.CLIENT_DISCONNECTED:
	print("Client disconnected")

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)

def char1_cb(chr):
    print("Write request with value = {}".format(chr.value()))

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

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

chr2 = srv2.characteristic(uuid=4567)

/********************************************/

/********************************************/

This is the code of the central device on the second LoPy :

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) == 'Glucose':
      try:
          print('1')
	  conn = bt.connect(adv.mac)
	  print('2')
	  services = conn.services()
          print('3')
	  for service in services:
	      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)

/**************************************/

/*************************************/

This is what I've acquired on the Central device consol after executing the two codes:

1
2
Error while connecting or reading from the BLE device 

/****************************************************/

I don't know why but the connection is always closed, I can't connect my Central device to my Gatt server

[jmarcelino]

Can you post your code as text please? It's really difficult to test and check as PNGs.

You can put it between a

```
Your code here
```

block to keep the formatting.