40 lines
1.2 KiB
Python
40 lines
1.2 KiB
Python
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# SPDX-FileCopyrightText: 2020 ladyada for Adafruit Industries
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# SPDX-License-Identifier: MIT
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"""
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Used with ble_uart_echo_test.py. Transmits "echo" to the UARTService and receives it back.
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"""
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import time
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from adafruit_ble import BLERadio
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from adafruit_ble.advertising.standard import ProvideServicesAdvertisement
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from adafruit_ble.services.nordic import UARTService
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ble = BLERadio()
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while True:
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while ble.connected and any(
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UARTService in connection for connection in ble.connections
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):
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for connection in ble.connections:
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if UARTService not in connection:
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continue
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print("echo")
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uart = connection[UARTService]
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uart.write(b"echo")
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# Returns b'' if nothing was read.
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one_byte = uart.read(4)
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if one_byte:
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print(one_byte)
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print()
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time.sleep(1)
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print("disconnected, scanning")
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for advertisement in ble.start_scan(ProvideServicesAdvertisement, timeout=1):
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if UARTService not in advertisement.services:
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continue
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ble.connect(advertisement)
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print("connected")
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break
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ble.stop_scan()
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