eeprom-abp.py

#!/bin/python
# Python code for writing eeprom data to a 25AA128

data = bytearray([

  # Set ABP Byte (1-byte)
  0x01,

  # TTN Device Address, 4 Bytes, MSB
  0xCB, 0x4B, 0xCC, 0x18, # devaddr

  # TTN Network Key, 16 Bytes, MSB
  0xB8, 0xA8, 0x2B, 0xB4, 0xB9, 0x73, 0xDF, 0x26, 0x21, 0x6E, 0x20, 0x35, 0x88, 0x17, 0xF0, 0x3F, # nwkey

  # TTN Application Key, 16 Bytes, MSB
  0x3A, 0x89, 0x5B, 0x87, 0xF1, 0x00, 0x7F, 0xA5, 0x5C, 0x8A, 0x85, 0x5D, 0xBD, 0x61, 0xEC, 0x63, # appkey
  ])

with open("lorawan-eeprom.bin", "wb") as out_file:
  out_file.write(data)

eeprom-otaa.py

#!/bin/python
# Python code for writing eeprom data to a 25AA128

data = bytearray([
  # Set OTAA Byte (1-byte)
  0x02,

  # TTN DevID (MSB, 8-bytes)
  0x00, 0x4A, 0x47, 0xA6, 0x46, 0x75, 0x2A, 0xAA, # DevID

  # TTN AppEUI (MSB, 8-bytes)
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, # AppEUI

  # TTN AppKey (MSB, 16-bytes)
  0xAA, 0x00, 0xDD, 0xB2, 0xA8, 0xD7, 0xD6, 0x83, 0xC6, 0x07, 0x22, 0x82, 0xEE, 0xD9, 0xC5, 0xCF,  # AppKey
  ])

with open("lorawan-eeprom.bin", "wb") as out_file:
  out_file.write(data)

example-circuitpython.py

# Create library object using our bus i2c port for si7021
i2c = busio.I2C(board.SCL, board.SDA)

# EEPROM Memory
import adafruit_24lc32
eeprom = adafruit_24lc32.EEPROM_I2C(i2c)

type = eeprom[0]
if type == b'\x01':
    print("LoRaWAN Type: ABP")
    devaddr = eeprom[1:5]
    nwkey = eeprom[5:21]
    app = eeprom[21:37]
else:
    print("LoRaWAN Type: Failed!!!")

ttn_config = TTN(devaddr, nwkey, app, country="US")
lora = TinyLoRa(spi, cs, irq, rst, ttn_config, channel=None)