Hi Fredrik,
First of all, CHAR_NOTIFY_EVENT works well on FiPy.
Could you tell me which version you are using? I tried my example on different versions and I haven't seen a missing descriptor error.
You can try the examples below. Please let me know about your experiment.
BR,
Meric
Subscribe_Event
def chr1_handler(chr, data):
global battery
global update
events = chr.events()
print("events: ",events)
if events & (Bluetooth.CHAR_READ_EVENT | Bluetooth.CHAR_SUBSCRIBE_EVENT):
chr.value(battery)
print("transmitted :", battery)
if (events & Bluetooth.CHAR_SUBSCRIBE_EVENT):
update = ~update
bluetooth = Bluetooth()
bluetooth.set_advertisement(name='FiPy 45', manufacturer_data="Pycom", service_uuid=0xec00)
bluetooth.callback(trigger=Bluetooth.CLIENT_CONNECTED | Bluetooth.CLIENT_DISCONNECTED, handler=conn_cb)
bluetooth.advertise(True)
srv1 = bluetooth.service(uuid=0xec00, isprimary=True,nbr_chars=1)
chr1 = srv1.characteristic(uuid=0xec0e, value='read_from_here') #client reads from here
chr1.callback(trigger=(Bluetooth.CHAR_READ_EVENT | Bluetooth.CHAR_SUBSCRIBE_EVENT), handler=chr1_handler)
def update_handler(update_alarm):
global battery
global update
battery-=1
if battery == 1:
battery = 100
if update:
chr1.value(battery)
update_alarm = Timer.Alarm(update_handler, 1, periodic=True)
Notify_Event
def char_notify_callback(char, arg):
char_value = (char.value())
print("New value: {}".format(char_value))
bt = Bluetooth()
bt.start_scan(-1)
adv = None
while(True):
adv = bt.get_adv()
if adv:
try:
if bt.resolve_adv_data(adv.data, Bluetooth.ADV_NAME_CMPL)=="FiPy 45":
conn = bt.connect(adv.mac)
try:
services = conn.services()
for service in services:
time.sleep(0.50)
chars = service.characteristics()
for char in chars:
c_uuid = char.uuid()
if c_uuid == 0xec0e:
if (char.properties() & Bluetooth.PROP_NOTIFY):
char.callback(trigger=Bluetooth.CHAR_NOTIFY_EVENT, handler=char_notify_callback)
print(c_uuid)
break
except:
continue
except:
continue
bt.stop_scan()
bt.disconnect_client()
