Update BLE code for CircuitPython 8 compatibility

Author: rdagger

BLE_Client_Server/client/code.py

@@ -2,16 +2,18 @@
 #
 # SPDX-License-Identifier: MIT
 
-from time import sleep
-from adafruit_ble.uart_client import UARTClient
-from adafruit_ble.scanner import Scanner
+from adafruit_ble import BLERadio
+from adafruit_ble.advertising.standard import ProvideServicesAdvertisement
+from adafruit_ble.services.nordic import UARTService
 from adafruit_bluefruit_connect.packet import Packet
 from adafruit_bluefruit_connect.button_packet import ButtonPacket
 from adafruit_bluefruit_connect.color_packet import ColorPacket
 from neopixel import NeoPixel
+from binascii import unhexlify
 from board import NEOPIXEL, SWITCH
 from adafruit_debouncer import Debouncer
 from digitalio import DigitalInOut, Direction, Pull
+from time import sleep
 import adafruit_fancyled.adafruit_fancyled as fancy
 
 pin = DigitalInOut(SWITCH)  # Set up built-in pushbutton switch
@@ -21,11 +23,11 @@
 
 pixels = NeoPixel(NEOPIXEL, 1)  # Set up built-in NeoPixel
 
-AQUA = 0x00FFFF    # (0, 255, 255)
-GREEN = 0x00FF00   # (0, 255, 0)
-ORANGE = 0xFF8000  # (255, 128, 0)
-RED = 0xFF0000     # (255, 0, 0)
-BLUE = 0x0000FF    # (0, 0, 255)
+AQUA = const(0x00FFFF)    # (0, 255, 255)
+GREEN = const(0x00FF00)   # (0, 255, 0)
+ORANGE = const(0xFF8000)  # (255, 128, 0)
+RED = const(0xFF0000)     # (255, 0, 0)
+BLUE = const(0x0000FF)    # (0, 0, 255)
 
 gradients = {'Off': [(0.0, RED), (0.75, ORANGE)],
              'On':  [(0.0, GREEN), (1.0, AQUA)]}
@@ -35,51 +37,62 @@
 color_index = 1
 fade_direction = 1
 
-TARGET = 'a0:b4:c2:d0:e7:f2'  # CHANGE TO YOUR BLE ADDRESS
+TARGET = 'f0:74:72:60:87:d2'  # CHANGE TO YOUR BLE ADDRESS
+target_address = TARGET.split(":")  # Convert address string to list of bytes
+target_address.reverse()  # Reverse bytes to match Address class little-endian
+target_address = unhexlify(''.join(target_address))  # Convert list to bytes
 
 button_packet = ButtonPacket("1", True)  # Transmits pressed button 1
 
-scanner = Scanner()  # BLE Scanner
-uart_client = UARTClient()  # BLE Client
+ble = BLERadio()
+uart_client = None
 
 while True:
     uart_addresses = []
     pixels[0] = BLUE  # Blue LED indicates disconnected status
     pixels.show()
 
-    # Keep trying to find target UART peripheral
-    while not uart_addresses:
-        uart_addresses = uart_client.scan(scanner)
-        for address in uart_addresses:
-            if TARGET in str(address):
-                uart_client.connect(address, 5)  # Connect to target
+    if not uart_client:
+        print("Trying to connect to BLE server...")
+        # Keep trying to find target UART peripheral
+        for adv in ble.start_scan(ProvideServicesAdvertisement):
+            print(adv.address.address_bytes)  # Print detected addresses
+            if adv.address.address_bytes == target_address:
+                uart_client = ble.connect(adv)
+                print("Connected")
+                break
+        ble.stop_scan()
 
-    while uart_client.connected:  # Connected
-        switch.update()
-        if switch.fell:  # Check for button press
-            try:
-                uart_client.write(button_packet.to_bytes())  # Transmit press
-            except OSError:
-                pass
-        # Check for LED status receipt
-        if uart_client.in_waiting:
-            packet = Packet.from_stream(uart_client)
-            if isinstance(packet, ColorPacket):
-                if fancy.CRGB(*packet.color).pack() == GREEN:  # Color match
-                    # Green indicates on state
-                    palette = fancy.expand_gradient(gradients['On'], 30)
-                else:
-                    # Otherwise red indicates off
-                    palette = fancy.expand_gradient(gradients['Off'], 30)
+    if uart_client and uart_client.connected:
+        uart_service = uart_client[UARTService]
+        while uart_client and uart_client.connected:  # Connected
+            switch.update()
+            if switch.fell:  # Check for button press
+                try:
+                    # Transmit press
+                    uart_service.write(button_packet.to_bytes())
+                except OSError:
+                    pass
+            # Check for LED status receipt
+            if uart_service.in_waiting:
+                packet = Packet.from_stream(uart_service)
+                if isinstance(packet, ColorPacket):
+                    # Color match
+                    if fancy.CRGB(*packet.color).pack() == GREEN:
+                        # Green indicates on state
+                        palette = fancy.expand_gradient(gradients['On'], 30)
+                    else:
+                        # Otherwise red indicates off
+                        palette = fancy.expand_gradient(gradients['Off'], 30)
 
-        # NeoPixel color fading routing
-        color = fancy.palette_lookup(palette, color_index / 29)
-        color = fancy.gamma_adjust(color, brightness=gamma_levels)
-        c = color.pack()
-        pixels[0] = c
-        pixels.show()
-        if color_index in (0, 28):
-            fade_direction *= -1  # Change direction
-        color_index += fade_direction
+            # NeoPixel color fading routing
+            color = fancy.palette_lookup(palette, color_index / 29)
+            color = fancy.gamma_adjust(color, brightness=gamma_levels)
+            c = color.pack()
+            pixels[0] = c
+            pixels.show()
+            if color_index == 0 or color_index == 28:
+                fade_direction *= -1  # Change direction
+            color_index += fade_direction
 
-        sleep(0.02)
+            sleep(0.02)