pygatt: Unable to execute device.subscribe()

Question

I am trying to subscribe to a GATT characteristic.

I have set the \"Indicate\", \"Notify\" and \"Read\" attributes for the GATT characteristic in my BLE device.

Answer 1

After revisiting this issue, i found that after adding some delays, i was able to subscribe to the characteristic:

Following is the code:-

import pygatt
import time
from binascii import hexlify

adapter = pygatt.BGAPIBackend()

def handle_data(handle, value):
    """
    handle -- integer, characteristic read handle the data was received on
    value -- bytearray, the data returned in the notification
    """
    print("Received data: %s" % hexlify(value))

try:
    time.sleep(5)
    adapter.start()
    time.sleep(5)
    device = adapter.connect('xx:xx:xx:xx:xx:xx')
    time.sleep(5)

    device.subscribe("845ce63c-d003-423c-8922-818676d34255",
                     callback=handle_data)
    time.sleep(5)
    while 1:
        pass
finally:
    print("Adapter Stopped")
    adapter.stop()