This is an Android Studio project for a starter Flutter/Dart app to get an Adafruit Clue and a mobile device performing bidirectional communication via BLE.
It uses the flutter_blue plugin. I have an Android device so did not set up permissions for iOS, directions on how to do that are on the pub.dev page.
The UART Serivce, documented by Adafruit, is used to pass strings between the devices. The app home screen has three buttons: Connect, Disconnect and Send Text. When the devices are connected the Send Text button will send the string "Goodnight Moon" to the Clue. A CircuitPython program running on the Clue echos the message to the mobile device along with the count of how many messages it has received since the last connection.
When I plugged in my Clue it advertised as CIRCUITPYbc57. Not sure if they are all the same but the advertising name is defined at the top of main.dart and can be changed if necessary.
Load the following CircuitPython program on the Clue and you should be able to communicate with this app.
from adafruit_ble import BLERadio
from adafruit_ble.advertising.standard import ProvideServicesAdvertisement
from adafruit_ble.services.nordic import UARTService
from adafruit_clue import clue
# turn on BLE
ble = BLERadio()
uart = UARTService()
while True:
# start advertising
advertisement = ProvideServicesAdvertisement(uart)
ble.start_advertising(advertisement)
print("Clue starting advertisement ...");
# wait to be connected
while not ble.connected:
pass
print("Clue connected.");
msg_count = 0; # of messages recieved
while ble.connected:
# get # of bytes in buffer
in_cnt = uart.in_waiting
# if UART has bytes waiting
if in_cnt:
# read message
rxbuf = uart.read(in_cnt)
# print it to serial port
print(rxbuf)
# increment count
msg_count += 1
# send massage and count to central
uart.write("{msg} ({count})".format(msg=rxbuf.decode(),count = msg_count))
print("Clue disconnected")
```
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