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# This example demonstrates a simple temperature sensor peripheral.

# The sensor's local value updates every second, and it will notify

# any connected central every 10 seconds.

# Work-in-progress demo of implementing bonding and passkey auth.

# This example demonstrates the low-level bluetooth module. For most

# applications, we recommend using the higher-level aioble library, which

# includes an implementation of the secret store. See

# https://github.com/micropython/micropython-lib/tree/master/micropython/bluetooth/aioble

import bluetooth

import random

import struct

import time

import json

import binascii

from ble_advertising import advertising_payload

from micropython import const

_IRQ_CENTRAL_CONNECT = const(1)

_IRQ_CENTRAL_DISCONNECT = const(2)

_IRQ_GATTS_INDICATE_DONE = const(20)

_IRQ_ENCRYPTION_UPDATE = const(28)

_IRQ_PASSKEY_ACTION = const(31)

_IRQ_GET_SECRET = const(29)

_IRQ_SET_SECRET = const(30)

_FLAG_READ = const(0x0002)

_FLAG_NOTIFY = const(0x0010)

_FLAG_INDICATE = const(0x0020)

_FLAG_READ_ENCRYPTED = const(0x0200)

# org.bluetooth.service.environmental_sensing

_ENV_SENSE_UUID = bluetooth.UUID(0x181A)

# org.bluetooth.characteristic.temperature

_TEMP_CHAR = (

bluetooth.UUID(0x2A6E),

_FLAG_READ | _FLAG_NOTIFY | _FLAG_INDICATE | _FLAG_READ_ENCRYPTED,

)

_ENV_SENSE_SERVICE = (

_ENV_SENSE_UUID,

(_TEMP_CHAR,),

)

# org.bluetooth.characteristic.gap.appearance.xml

_ADV_APPEARANCE_GENERIC_THERMOMETER = const(768)

_IO_CAPABILITY_DISPLAY_ONLY = const(0)

_IO_CAPABILITY_DISPLAY_YESNO = const(1)

_IO_CAPABILITY_KEYBOARD_ONLY = const(2)

_IO_CAPABILITY_NO_INPUT_OUTPUT = const(3)

_IO_CAPABILITY_KEYBOARD_DISPLAY = const(4)

_PASSKEY_ACTION_INPUT = const(2)

_PASSKEY_ACTION_DISP = const(3)

_PASSKEY_ACTION_NUMCMP = const(4)

class BLETemperature:

def __init__(self, ble, name="mpy-temp"):

self._ble = ble

self._load_secrets()

self._ble.irq(self._irq)

self._ble.config(bond=True)

self._ble.config(le_secure=True)

self._ble.config(mitm=True)

self._ble.config(io=_IO_CAPABILITY_DISPLAY_YESNO)

self._ble.active(True)

self._ble.config(addr_mode=2)

((self._handle,),) = self._ble.gatts_register_services((_ENV_SENSE_SERVICE,))

self._connections = set()

self._payload = advertising_payload(

name=name, services=[_ENV_SENSE_UUID], appearance=_ADV_APPEARANCE_GENERIC_THERMOMETER

)

self._advertise()

def _irq(self, event, data):

# Track connections so we can send notifications.

if event == _IRQ_CENTRAL_CONNECT:

conn_handle, _, _ = data

self._connections.add(conn_handle)

elif event == _IRQ_CENTRAL_DISCONNECT:

conn_handle, _, _ = data

self._connections.remove(conn_handle)

self._save_secrets()

# Start advertising again to allow a new connection.

self._advertise()

elif event == _IRQ_ENCRYPTION_UPDATE:

conn_handle, encrypted, authenticated, bonded, key_size = data

print("encryption update", conn_handle, encrypted, authenticated, bonded, key_size)

elif event == _IRQ_PASSKEY_ACTION:

conn_handle, action, passkey = data

print("passkey action", conn_handle, action, passkey)

if action == _PASSKEY_ACTION_NUMCMP:

accept = int(input("accept? "))

self._ble.gap_passkey(conn_handle, action, accept)

elif action == _PASSKEY_ACTION_DISP:

print("displaying 123456")

self._ble.gap_passkey(conn_handle, action, 123456)

elif action == _PASSKEY_ACTION_INPUT:

print("prompting for passkey")

passkey = int(input("passkey? "))

self._ble.gap_passkey(conn_handle, action, passkey)

else:

print("unknown action")

elif event == _IRQ_GATTS_INDICATE_DONE:

conn_handle, value_handle, status = data

elif event == _IRQ_SET_SECRET:

sec_type, key, value = data

key = sec_type, bytes(key)

value = bytes(value) if value else None

print("set secret:", key, value)

if value is None:

if key in self._secrets:

del self._secrets[key]

return True

else:

return False

else:

self._secrets[key] = value

return True

elif event == _IRQ_GET_SECRET:

sec_type, index, key = data

print("get secret:", sec_type, index, bytes(key) if key else None)

if key is None:

i = 0

for (t, _key), value in self._secrets.items():

if t == sec_type:

if i == index:

return value

i += 1

return None

else:

key = sec_type, bytes(key)

return self._secrets.get(key, None)

def set_temperature(self, temp_deg_c, notify=False, indicate=False):

# Data is sint16 in degrees Celsius with a resolution of 0.01 degrees Celsius.

# Write the local value, ready for a central to read.

self._ble.gatts_write(self._handle, struct.pack("<h", int(temp_deg_c * 100)))

if notify or indicate:

for conn_handle in self._connections:

if notify:

# Notify connected centrals.

self._ble.gatts_notify(conn_handle, self._handle)

if indicate:

# Indicate connected centrals.

self._ble.gatts_indicate(conn_handle, self._handle)

def _advertise(self, interval_us=500000):

self._ble.config(addr_mode=2)

self._ble.gap_advertise(interval_us, adv_data=self._payload)

def _load_secrets(self):

self._secrets = {}

try:

with open("secrets.json", "r") as f:

entries = json.load(f)

for sec_type, key, value in entries:

self._secrets[sec_type, binascii.a2b_base64(key)] = binascii.a2b_base64(value)

except:

print("no secrets available")

def _save_secrets(self):

try:

with open("secrets.json", "w") as f:

json_secrets = [

(sec_type, binascii.b2a_base64(key), binascii.b2a_base64(value))

for (sec_type, key), value in self._secrets.items()

]

json.dump(json_secrets, f)

except:

print("failed to save secrets")

def demo():

ble = bluetooth.BLE()

temp = BLETemperature(ble)

t = 25

i = 0

while True:

# Write every second, notify every 10 seconds.

i = (i + 1) % 10

temp.set_temperature(t, notify=i == 0, indicate=False)

# Random walk the temperature.

t += random.uniform(-0.5, 0.5)

time.sleep_ms(1000)

if __name__ == "__main__":

demo()

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