Install bluepy on Raspberry Pi, for Python3, and examples.

bluepy is a Python interface to Bluetooth LE on Linux.

To install bluepy on Raspberry Pi for Python3, enter the command:

$ sudo apt-get install python3-pip libglib2.0-dev
$ sudo pip3 install bluepy

ref:

~ bluepy documentation

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bluepy examples:

There are two examples in bluepy, scanner and notification. Here how I modify it for Python3 working on Raspberry Pi, work with ESP32 BLE_uart example.

scanner.py

from bluepy.btle import Scanner, DefaultDelegate

class ScanDelegate(DefaultDelegate):
    def __init__(self):
        DefaultDelegate.__init__(self)

    def handleDiscovery(self, dev, isNewDev, isNewData):
        if isNewDev:
            print("Discovered device", dev.addr)
        elif isNewData:
            print("Received new data from", dev.addr)

scanner = Scanner().withDelegate(ScanDelegate())
devices = scanner.scan(10.0)

for dev in devices:
    print("Device %s (%s), RSSI=%d dB" % (dev.addr, dev.addrType, dev.rssi))
    for (adtype, desc, value) in dev.getScanData():
        print("  %s = %s" % (desc, value))

notification.py

from bluepy import btle

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

    def handleNotification(self, cHandle, data):
        print("\n- handleNotification -\n")
        print(data)
        # ... perhaps check cHandle
        # ... process 'data'


# Initialisation  -------

p = btle.Peripheral("3c:71:bf:0d:dd:6a")
p.setDelegate( MyDelegate() )

# Setup to turn notifications on, e.g.
svc = p.getServiceByUUID("6E400001-B5A3-F393-E0A9-E50E24DCCA9E")
ch = svc.getCharacteristics("6E400003-B5A3-F393-E0A9-E50E24DCCA9E")[0]
#   ch.write( setup_data )

setup_data = b"\x01\00"
p.writeCharacteristic(ch.valHandle+1, setup_data)

# Main loop --------

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

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

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Next:

~ Bi-direction BLE communication between Raspberry Pi/Python (with PyQt5 GUI) and ESP32