BLE Notification example: Python/Raspberry Pi read notification from ESP32 BLE server to display Analog Input

It's a Python example run on Raspberry Pi, using libraries bluepy/matplotlib, connect to ESP32 BLE Server (run on ESP32-DevKitC V4), handle notification, and plot the value graphically. It's modified from last exercise of Python/Raspberry Pi handle Notification from ESP32 BLE_notify example.

pyBLE_test_waitNotification_AIN.py

# Python3 example on Raspberry Pi to handle notification from
# ESP32 BLE_notify example.
#
# To install bluepy for Python3:
# $ sudo pip3 install bluepy

from bluepy import btle
import matplotlib.pyplot as plt

value = [0]*30

plt.ylim([0, 256])
plt.plot(value)
plt.draw()
plt.pause(0.01)

class MyDelegate(btle.DefaultDelegate):
    def __init__(self):
        btle.DefaultDelegate.__init__(self)
        # ... initialise here

    def handleNotification(self, cHandle, data):
        # ... perhaps check cHandle
        # ... process 'data'
        #print(type(data))
        #print(dir(data))
        print(data)
        print(data[0])
        
        value.pop(0)
        value.append(data[0])
        plt.clf()
        plt.ylim([0, 256])
        plt.plot(value)
        plt.draw()
        plt.pause(0.01)
        
# Initialisation  -------
address = "24:0a:c4:e8:0f:9a"
service_uuid = "4fafc201-1fb5-459e-8fcc-c5c9c331914b"
char_uuid = "beb5483e-36e1-4688-b7f5-ea07361b26a8"

p = btle.Peripheral(address)
p.setDelegate(MyDelegate())

# Setup to turn notifications on, e.g.
svc = p.getServiceByUUID(service_uuid)
ch = svc.getCharacteristics(char_uuid)[0]

"""
setup_data for bluepy noification-
"""
setup_data = b"\x01\x00"
#ch.write(setup_data)
p.writeCharacteristic(ch.valHandle + 1, setup_data)

ch_data = p.readCharacteristic(ch.valHandle + 1)
print(type(ch_data))
print(ch_data)

print("=== Main Loop ===")

while True:
    if p.waitForNotifications(1.0):
        # handleNotification() was called
        continue

    #print("Waiting...")
    # Perhaps do something else here