Bluetooth UI button send commands

[smiddleton]

Hey guys,
I'm hoping you can help. I'm pretty stuck. I have created a UI that has a button on it. When I press the button I want it to send a character to my arduino device. The example below works perfect when I run it. The problem is, I can't figure out how to put this code, self.peripheral.write_characteristic_value(c, 'H', False), into the def button function I have so that it send the character when the button is pressed, instead of when it connects. Any help is very much appreciated. I have been stuck on this for about 2 days now. Thanks!

import cb

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

    def did_discover_peripheral(self, p):
        if p.name == 'HM-10-BLE' and not self.peripheral:
            print 'Discovered ' + p.name
            self.peripheral = p
            cb.connect_peripheral(self.peripheral)

    def did_connect_peripheral(self, p):
        print 'Connected Peripheral ' + p.name
        print 'Looking for Service FFE0'
        p.discover_services()

    def did_discover_services(self, p, error):
        for s in p.services:
            if s.uuid == 'FFE0':
                print 'Found Service ' + s.uuid
                print 'Looking for Characteristic FFE1'
                p.discover_characteristics(s)

    def did_discover_characteristics(self, s, error):
        for c in s.characteristics:
            if c.uuid == 'FFE1':
                print 'Found Characteristic ' + c.uuid
                print 'Writing H'
                self.peripheral.write_characteristic_value(c, 'H', False)



cb.set_central_delegate( MyCentralManagerDelegate() )
print 'Looking for HM-10-BLE module'
cb.scan_for_peripherals()

# Keep the connection alive until the 'Stop' button is pressed:
try:
    while True: pass
except KeyboardInterrupt:
    # Disconnect everything:
    cb.reset()

[JonB]

@Phuket2 Also, really those two methods should just be part of the blunobeetleview class, which avoids having to use globals.

[Phuket2]

@JonB , yeah i realise that. Like you, I was trying to filter how much to say while still being helpful. It's tricky :)

[smiddleton]

Thanks guys. Everything your saying is helpful! I appreciate you taking the time to try and teach me how to do it.

[smiddleton]

...I'm still stuck...

[JonB]

Did you try the code I posted?
Post a gist of where you are at, and we can work from there...

[smiddleton]

Hi Jon B,
Thanks for the reply. Yes, I still didn't get that working either. Maybe I need to change the name of the button in my.ui...

[JonB]

Post what you are trying... What errors are you getting.

[smiddleton]

It says "object hs no attribute," referencing the button. I created a separate UI and I am trying to work that in too. The error only happens after I press the word that says "button", after it appears on the screen.

[JonB]

Look, we can't help you unless you post the code you are using, along with a full traceback (print traceback).

[JonB]

Btw, in the last code you posted, you don't present your ui until after you press the X... So that may be party of your issue!

[smiddleton]

Hi, sorry about that. Here is a screen shot. Not a lot of time to post code with my kiddos running around so I grab a few minutes here and there when I can.

Print trace back line 38.

    def a(self,sender):
        c=self.characteristic
        ```
Error says,
Traceback (most recent call last):
  File "/private/var/mobile/Containers/Shared/AppGroup/DEE1AA35-7934-4C6D-85F7-C62F8C4760BD/Pythonista3/Documents/ui test.py", line 38, in a
    c=self.characteristic
AttributeError: 'MyCentralManagerDelegateView' object has no attribute 'characteristic'
Traceback (most recent call last):
  File "/private/var/mobile/Containers/Shared/AppGroup/DEE1AA35-7934-4C6D-85F7-C62F8C4760BD/Pythonista3/Documents/ui test.py", line 38, in a
    c=self.characteristic
AttributeError: 'MyCentralManagerDelegateView' object has no attribute 'characteristic'

[JonB]

you need to make sure you have

self.characteristic=c

in did_discover_characteristic.

[smiddleton]

Hmm...I checked and it does say that. What isn't working?

[JonB]

Open the code. Press the share button, then choose share to gist. Then paste the link back here.

[smiddleton]

This is the entire code. Thanks for the help.

import cb
import ui

class MyCentralManagerDelegateView (ui.View):
    def __init__(self):
        self.peripheral = None
        self.charactetistic= None
        self.b=ui.Button(title='button')
        self.add_subview(self.b)
        self.b.action=self.a
        self.frame=(0,0,320,570)
    def did_discover_peripheral(self, p):
        if p.name == 'Bluno' and not self.peripheral:
            print ('Discovered ')+ p.name
            self.peripheral = p
            cb.connect_peripheral(self.peripheral)

    def did_connect_peripheral(self, p):
        print ('Connected Peripheral ') + p.name
        print ('Looking for Service FFE0')
        p.discover_services()

    def did_discover_services(self, p, error):
        for s in p.services:
            if s.uuid == 'DFB0':
                print ('Found Service ') + s.uuid
                print ('Looking for Characteristic FFE1')
                p.discover_characteristics(s)

    def did_discover_characteristics(self, s, error):
        for c in s.characteristics:
            if c.uuid == 'DFB1':
                print ('Found Characteristic') + c.uuid
                self.characteristic=c
                print ('Writing H')
            
    def a(self,sender):
        c=self.characteristic
        self.peripheral.write_characteristic_value(c, 'H', False)

    def close(self):
        cb.reset()

v=MyCentralManagerDelegateView()
cb.set_central_delegate( v)
print ('Looking for HM-10-BLE module')
cb.scan_for_peripherals()
v.present('sheet')```

[LoriNagle]

This post is deleted!