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Hi,

i am trying to write a chat client with a arduino controller. For now i am connecting to JDY-08 and sending the command on\n in hex. This works and the Arduino answer with "LED_on" but how can i recieve this string in Python???

import cb
import struct
from pprint import pprint

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

    def did_discover_peripheral(self, p):
        print('+++ Discovered peripheral: %s (%s)' % (p.name, p.uuid))
        if p.name and 'JDY-08' in p.name and not self.peripheral:
            # Keep a reference to the peripheral, so it doesn't get garbage-collected:
            self.peripheral = p
            cb.connect_peripheral(self.peripheral)

    def did_connect_peripheral(self, p):
        print('*** Connected: %s' % p.name)
        print('Discovering services...')
        p.discover_services()

    def did_fail_to_connect_peripheral(self, p, error):
        print('Failed to connect')

    def did_disconnect_peripheral(self, p, error):
        print('Disconnected, error: %s' % (error,))
        self.peripheral = None

    def did_discover_services(self, p, error):
        for s in p.services:
            print s.uuid
            if 'FE96' in s.uuid:
                print('+++ Different Service found')
                p.discover_characteristics(s)
            elif 'FFE0' in s.uuid:
                print('+++ Arduino found')
                p.discover_characteristics(s)

    def did_discover_characteristics(self, s, error):

        if 'FFE0' in s.uuid:
            pprint(s)
            for c in s.characteristics:
                pprint(c)
                if 'FFE1' in c.uuid:
                    print('Enabling Arduino Cmd1...')
                    self.peripheral.write_characteristic_value(c, chr(0x6F), False)
                    self.peripheral.write_characteristic_value(c, chr(0x6E), False)
                    self.peripheral.write_characteristic_value(c, chr(0x0a), True)

                elif 'AA01' in c.uuid:

                    print('Enabling temperature sensor notifications...')
                    self.peripheral.set_notify_value(c, True)
        elif 'FFE3' in s.uuid:
            print('Enabling notifications for Simple Key Service...')

    def did_write_value(self, c, error):

        print('Did enable Arduino 1')

    def did_update_value(self, c, error):
        print('update:')
        pprint(c.value.encode('hex'))
        if 'FFE1' == c.uuid:

            print('Get value: %s' % c.value.encode('hex'))

        else:

            print('Nothing')


delegate = MyCentralManagerDelegate()
print('Scanning for peripherals...')
cb.set_central_delegate(delegate)
cb.scan_for_peripherals()

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

Thanks a lot.

Cu kami

Hi,

anyone here how can help me with the recieving problem? Thanks a lot.

Cu kami

I‘m not sure, but maybe you first need a

Peripheral.read_characteristic_value(characteristic)

„When the value has been read, your central delegate will receive a did_update_value callback, at which point you can access the value with the characteristics’s value attribute. “