BLE Data Transfer Question

[mitchlau]

HI i have a project need to send data from pycom to IOS.
I success send data from peripheral(pycom) to central(IOS)

However the problem is, the data is too big to send
after i do research i find out every single send can only 20 bits

so my idea is cut all data to 20 bits and send data as below
Pycom -------send first 20 bits----------> IOS
Pycom <------response whatever------- IOS
Pycom -------send other 20 bits----------> IOS
Pycom <------response whatever------- IOS
Pycom -------send other 20 bits----------> IOS

is anyone can tell me how to send data in BLE for 300 word of string???

Below is part of my code

# See https://docs.pycom.io for more information regarding library specifics

bluetooth = Bluetooth()
bluetooth.set_advertisement(name='LoPy', service_uuid=b'12312390123456')

def conn_cb (bt_o):
    events = bt_o.events()
    if  events & Bluetooth.CLIENT_CONNECTED:
        print("Client connected")
    elif events & Bluetooth.CLIENT_DISCONNECTED:
        print("Client disconnected")

bluetooth.callback(trigger=Bluetooth.CLIENT_CONNECTED | Bluetooth.CLIENT_DISCONNECTED, handler=conn_cb)

bluetooth.advertise(True)

srv1 = bluetooth.service(uuid=b'1223190123456', isprimary=True)
chr1 = srv1.characteristic(uuid=b'ab3451230123456', value=5)
while True:
    print("Send Data")
    chr1.value("here is the data need to be send  it should be a very very long string")
    time.sleep(3.050)

[Wolli01]

Cool, I need it the other way around.
I would like to send login data from my mobile phone to my Wipy/Lopy.
Can you help me with how to proceed?