I-NUCLEO-LRWAN1

Arduino library to support I-NUCLEO-LRWAN1 LoRa® expansion board based on USI® LoRaWAN™ technology module.

API

This library provides an Arduino API to manage the I-NUCLEO-LRWAN1 expansion board as a LoRaWAN™ node.

• You will be able to choose the ABP or OTAA mode and set the corresponding keys.
• Send and receive some data.
• Select the EU or US band.
• Enable or disable the duty cycle (must be enabled in EU band).
• Enable the adaptative data rate and configure the data rate.
• Put the device in sleep mode.

This library provides also an API to manage the I-NUCLEO-LRWAN1 expansion board as a simple LoRa® radio module.

• Configure the radio parameters (frequency, tx power, spreading factor, band width, ...)
• Send/receive data
• LoRaWAN stack disabled

Known limitations

• The module supports only class A.
• Sleep mode is not supported in OTAA mode with the version 2.6 of the firmware.

• Important note for Nucleo64:

  By default, D0/D1 of CN9 board connector are respectively not connected to PA3 and PA2 (SB62 and SB63 opened). Those pins are connected to STLink USART thanks to SB13, SB14.

  To use the shield:

  • Connect shield D0(Tx) to a free U(S)ARTn Rx pin
  • Connect shield D1(Rx) to a free U(S)ARTn Tx pin

  Where 'n' are the same U(S)ART number.

  • Update the Serial instance definition used for LoRa using the chosen Rx/Tx

  or

  • Close SB62 and SB63 to connect D0/D1 of CN9 connector to PA3 and PA2
  • Open SB13 and SB14 to disconnect PA3 and PA2 from STLink UART

  but in this case, you will have to wire STLink Rx/Tx of CN3 connector to another pins and update Serial instance before call Serial.begin(115200); using:

  Serial.setRx(Rx pin);
  Serial.setTx(Tx pin);

  See UM1724, §6.8 section for more information.

Examples

• getInfo: display several info about LoRa shield (Firmware version, device EUI,...)
• LoRaWANABP: send/receive data in ABP mode.
• LoRaWANOTAA: send/receive data in OTAA mode.
• LoRaPingPong: P2P exchange in LoRa®.
• BridgeSerial: Send/Receive AT command from/to PC terminal to/from shield (console mode).

Advice

LoRaWAN default configuration:

• Join accept delay is set to 5000 ms (LoRaWAN default value).
• The network type is public by default. Use setPublicNwkMode() to set the network type in private.
• RX1 window delay is 1000 ms by default. Use setRx1Delay() to set a new value.

In case of high latency between the gateway and the network server, it is recommended to increase the delay time of the RX1 window.

Version

This library is based on the STM32CubeExpansion_LRWAN_V1.1.2 driver. This library has been validated with the version 2.6 and 3.6 of the firmware.

Documentation

You can find the source files at
https://github.com/stm32duino/I-NUCLEO-LRWAN1

The I-NUCLEO-LRWAN1 module datasheet is available at
https://github.com/USILoRaModule/USI_I-NUCLEO-LRWAN1

LoRaWAN standard
https://www.lora-alliance.org