LoPy: bytes data received in HEX convert to original text

  • To whom it concerns,
    I'm sending LoRa messages from an Adafruit Radio bonnet to a LoPy4 but the message received seems to be in Hex -

    Adafruit Radio bonnet with the following settings:

    # Configure LoRa Radio
    CS = DigitalInOut(board.CE1)
    RESET = DigitalInOut(board.D25)
    spi = busio.SPI(board.SCK, MOSI=board.MOSI, MISO=board.MISO)
    rfm9x = adafruit_rfm9x.RFM9x(spi, CS, RESET, 869.85) # freq = 869.85mHz
    rfm9x.tx_power = 23
    rfm9x.spreading_factor = 12
    rfm9x.signal_bandwidth = 125000
    rfm9x.preamble_length = 8

    when button "A" is pressed "Hello" is transmitted as follows:

    button_a_data = bytes("Hello","utf-8")

    On the LoPy4 set up as follows:

    lora = LoRa(mode=LoRa.LORA, region=LoRa.EU868, sf=12, frequency=869850000, bandwidth=LoRa.BW_125KHZ, public=False, preamble=8, coding_rate=LoRa.CODING_4_5, tx_iq=False, rx_iq=False, power_mode=LoRa.ALWAYS_ON, tx_power=14)
    s = socket.socket(socket.AF_LORA, socket.SOCK_RAW)
    raw_data = s.recv(32)
    if len(raw_data) != 0:
       print('RX: data received')
            data = raw_data.decode("utf-8")

    The LoPy receives the "Hello" from the Adafruit Radio Bonnet as follows:

    RX: data received
    data length: 9
    data type: <class 'bytes'>
    data: b'\xff\xff\x00\x00tO+\xf1\x80'

    In the above code I attempt to convert bytes to string:

    data type: <class 'str'>
    string data: ��tO+�

    RSSI: -126, SNR: -7.0

    How should I interpret the raw data received and convert it back to the original "Hello" transmitted?

    Thank you,


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