Problems calling a function from a class

[robertiii]

When I try to use the sendData function, I get an error stating that nonObject has write_characteristic_value.

class bellRinger (object):
	def __init__(self):
		self.peripheral = None
		self.characteristic = None

	def did_discover_peripheral(self, p):
		if p.name and 'School Bell' in p.name and not self.peripheral:  #Change Name Here
			self.peripheral = p
			peripheral = p
			cb.connect_peripheral(p)

	def did_connect_peripheral(self, p):
		p.discover_services()

	def did_fail_to_connect_peripheral(self, p, error):
		print('Failed to Connect')
		
	def did_disconnect_peripheral(self, p, error):
		self.peripheral = None

	def did_discover_services(self, p, error):
		for s in p.services:
			if s.uuid == 'FFE0':
				p.discover_characteristics(s)

	def did_discover_characteristics(self, s, error):
		for c in s.characteristics:
			if c.uuid == 'FFE1':
				self.characteristic = c
				characteristic = c
				self.peripheral.set_notify_value(c, True)

	def did_update_value(self, c, error):
		print('Got Something',c.value)
	
	def sendData():
		c = self.characteristic
		self.peripheral.write_characteristic_value(c, 'ring/', True)

mngr = bellRinger()
cb.set_central_delegate(mngr)
cb.scan_for_peripherals()
mngr.sendData()

[robertiii]

Strangely enough it does work if called from a button action....

[JonB]

not strange at all -- you are calling sendData before the characteristic has been discovered.

You may want to have

while mngr.characteristic is None:
    time.sleep(1)
mngr.sendData()

[robertiii]

Thank you!!!!!!!