adding BLE airlift example for template page

Author: BlitzCityDIY

CircuitPython_Templates/airlift_ble_example/code.py

@@ -0,0 +1,74 @@
+# SPDX-FileCopyrightText: 2020 Dan Halbert, written for Adafruit Industries
+#
+# SPDX-License-Identifier: Unlicense
+
+# pylint: disable=unused-import
+import board
+import busio
+from digitalio import DigitalInOut
+from adafruit_ble import BLERadio
+from adafruit_ble.advertising.standard import ProvideServicesAdvertisement
+from adafruit_ble.services.nordic import UARTService
+from adafruit_esp32spi import adafruit_esp32spi
+from adafruit_airlift.esp32 import ESP32
+
+# If you are using a Metro M4 Airlift Lite, PyPortal,
+# or MatrixPortal, you can use the default pin settings.
+# Leave this DEFAULT line uncommented.
+# If you are using a board with pre-defined ESP32 Pins:
+esp32 = ESP32()
+
+# If you are using a Metro M7 **OR**
+# if you are using CircuitPython 6.0.0 or earlier,
+# on PyPortal and PyPortal Titano only, use the pin settings
+# below. Comment out the DEFAULT line above and uncomment
+# the line below. For CircuitPython 6.1.0, the pin names
+# have changed for these boards, and the DEFAULT line
+# above is correct.
+# esp32 = ESP32(tx=board.TX, rx=board.RX)
+
+# If you are using an AirLift FeatherWing or AirLift Bitsy Add-On,
+# use the pin settings below. Comment out the DEFAULT line above
+# and uncomment the lines below.
+# If you are using an AirLift Breakout, check that these
+# choices match the wiring to your microcontroller board,
+# or change them as appropriate.
+# esp32 = ESP32(
+#     reset=board.D12,
+#     gpio0=board.D10,
+#     busy=board.D11,
+#     chip_select=board.D13,
+#     tx=board.TX,
+#     rx=board.RX,
+# )
+
+# If you are using an AirLift Shield,
+# use the pin settings below. Comment out the DEFAULT line above
+# and uncomment the lines below.
+# esp32 = ESP32(
+#     reset=board.D5,
+#     gpio0=board.D6,
+#     busy=board.D7,
+#     chip_select=board.D10,
+#     tx=board.TX,
+#     rx=board.RX,
+# )
+
+adapter = esp32.start_bluetooth()
+
+ble = BLERadio(adapter)
+uart = UARTService()
+advertisement = ProvideServicesAdvertisement(uart)
+
+while True:
+    ble.start_advertising(advertisement)
+    print("waiting to connect")
+    while not ble.connected:
+        pass
+    print("connected: trying to read input")
+    while ble.connected:
+        # Returns b'' if nothing was read.
+        one_byte = uart.read(1)
+        if one_byte:
+            print(one_byte)
+            uart.write(one_byte)