BLE ATT Wrapper



  • Example of creating BLE GATT services and characteristics.

    https://github.com/cmisztur/pycom-ble-gatt-wrapper

    usage:

    import gc
    import machine
    import utime
    import ubinascii
    import uos
    from machine import Timer
    
    from L99_BLEGATTS import BLEGATTS
    
    hardware_serial = ubinascii.hexlify(machine.unique_id()).decode()
    l99_serial = 'L99-%s' % hardware_serial
    
    def ble_connection_callback(is_connected):
        if is_connected: 
            print("BLE connected")
        else:
            print("BLE disconnected")
    
    ble = BLEGATTS()
    ble.init(advert_name=l99_serial, connect_callback=ble_connection_callback)
    
    ble.addService(service_name='device_info',uuid=6154) \
        .addReadChar (name='l99_serial', uuid=0, static_read=l99_serial) \
        .addReadChar (name='hardware_serial', uuid=1, static_read=hardware_serial) \
        .addReadChar (name='sysname', uuid=2, dynamic_read=lambda cn,id: uos.uname()[0]) \
        .addReadChar (name='nodename', uuid=3, dynamic_read=lambda cn,id: uos.uname()[1]) \
        .addReadChar (name='release', uuid=4, dynamic_read=lambda cn,id: uos.uname()[2]) \
        .addReadChar (name='version_number', uuid=5, dynamic_read=lambda cn,id: uos.uname()[3].split(' on ')[0]) \
        .addReadChar (name='version_date', uuid=6, dynamic_read=lambda cn,id: uos.uname()[3].split(' on ')[1]) \
        .addReadChar (name='machine', uuid=7, dynamic_read=lambda cn,id: uos.uname()[4]) \
        .addReadChar (name='lora_version', uuid=8, dynamic_read=lambda cn,id: uos.uname()[5]) \
        .start()
    
    ble.addService(service_name='char_tests',uuid=0) \
        .addNotifyChar (name='note1', uuid=0, static_read=0) \
        .addReadNotifyChar (name='note2', uuid=1, static_read=0) \
        .addReadChar (name='self', uuid=2, dynamic_read=lambda cn,id: cn+str(id)) \
        .addReadWriteChar (name='r+w', uuid=3,
                            dynamic_read=lambda cn,id: char_rw_test_read(cn,id),
                            dynamic_write=lambda cn,id,val: char_rw_test_write(cn,id,val)) \
        .addReadWriteNotifyChar (name='r+w+n', uuid=4,
                                dynamic_read=lambda cn,id: char_rwn_test_read(cn,id),
                                dynamic_write=lambda cn,id,val: char_rwn_test_write(cn,id,val)) \
        .start()
    
    ble.advertise()
    
    rw_var = 1337
    
    def char_rw_test_read(char_name,char_uuid):
        global rw_var
        return rw_var
    
    def char_rw_test_write(char_name,char_uuid,char_value):
        global rw_var
        rw_var = char_value
    
    def char_rwn_test_read(char_name,char_uuid):
        global rw_var
        return rw_var
    
    def char_rwn_test_write(char_name,char_uuid,char_value):
        global rw_var
        rw_var = char_value
        global ble
        ble.setCharValue('char_tests','r+w+n',rw_var) # ain't gonna notify itself
    
    def char_timer(t):
        global counter
        counter = counter + 1
        ble.setCharValue('char_tests','note1',counter)
        ble.setCharValue('char_tests','note2',counter) # i can only get one or the other to notify, but not both
    
    counter = 1
    timer = Timer.Alarm(handler=char_timer, ms=2000, periodic=True)
    

 

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