Firmware & Changelog (LOB-GW-DINRAIL-HYB-MODBUS)

Firmware Downloads

app-hybrid-modbus-TZ2-0.4.0+battery-mcuboot-slot0-boot.hexcurrent version for battery powered variant
current version for externally powered variants
app-hybrid-modbus-TZ2-0.1.3-mcuboot-slot0-boot.hexfirst public release


app-hybrid-modbus – Modbus over various WAN technologies.

This changelog's format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

Planned features

  • Execute Modbus Commands per LTE-Downlink
  • Modbus TCP
  • LAN connection to backend (over ethernet, dinrail only)



  • Increase size usable for config (allow for much bigger config/longer modbus commands).
  • Verify on boot that secure firmware is of sufficient version.



  • DNS and DTLS support for NB-IoT/LTE-M.
  • Revert temporary config (from remote command), if backend cannot be reached.
  • Revert temporary firmware (from remote update), if backend cannot be reached.
  • Add virtual internal modbus device to bridge, that can be addressed to read internal values (current time, internal modem temperature, current voltage) on address 0xfa=250 (configurable).
  • New config parameter InternalAddress.
  • Add Lost Reboot feature for LoRaWAN that resets device if LoRaWAN is network connection is lost.
  • New config parameter LostReboot.
  • (battery only) Add config parameter ExternalAntenna to support use of external antenna.
  • Feedback for power on self test of modbus commands.


  • (battery only) Adjust power-off-setting for new addon to avoid leakage.
  • Config parameter Host now supports optional protocol prefixes coap:// and coaps://.
  • Set default host configuration to coaps://
  • Add voltage and temperature to LoRaWAN status message.

0.2.1 - 2022-02-14


  • Support for LoRaWAN Class C.
  • New Config Parameter OpMode for selecting Class A or Class C operation mode for LoRaWAN.
  • Add Lost-Network feature for LTE.


  • Removed double status message uplink on boot for LoRaWAN.



  • Support for battery powered hardware variant, using mikrobus-rs485-var nrf-addon-rs485-VBat-rev1.
  • (Battery only) Add config parameter PowerOnDelay for letting attached slaves power up.



  • Allow 8E1 in UART config.

0.1.4 - pre-release 2021-11-23


  • Add additional compact LoRaWAN payload formats known from the LoRaWAN Bridge device.
  • Add config parameters PlFmt, PlMax, PlId for controlling the LoRaWAN payload format.


  • A timing issue could lead to the dialog mode not working properly.

0.1.3 - pre-release 2021-11-17


  • Interactive Dialog Mode for testing setups.
  • LED feedback about state of Modbus and WAN connections.
  • Execute Modbus Commands remotely via LoRaWAN Downlink.

0.1.2 - pre-release 2021-11-15

  • This is a pre-release! It is neither complete nor fully tested!


  • Support for NB-IoT, LTE-M, and LoRaWAN.
  • Downlinks for remote config (all WAN technologies) and firmware updates (NB-IoT and LTE-M only)


  • Boot Firmware >=1.7.1
  • Modem Firmware >=1.2.0

0.1.0 - 2021-07-02


  • Start new app for Hybrid NB-IoT/LoRaWAN Modbus Gateway.