10 things you can’t ignore when writing a Firmware

When you write an IoT firmware, there are different things you may never forget to think about… The coming 10 things you can’t ignore are coming from my experience of smart object creation and the associated field experience.

The field experience is unfortunately the real step where you will improve your firmware and discover all you have forgotten when you have written the firmware and tested it in your laboratory. In laboratory everything is perfect.

The following 10 things you can’t ignore when writing a Firmware is a non exhaustive checklist of points to verify before pushing your code to the field. It is also a list of  test conditions you can execute to validate a Firmware / device made by a third party.

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RN2483 – LoRa – upgrade firmware

Microchip RN2483 Lora

Microchip RN2483 Lora

The microchip device is in most of the case delivered with a 0.9.5 a version 1 seems to be available even if not downloadable from microchip product webpage.

This link contains a version 1.0 and a java tool that helps to configure the chip with a graphical interface. It is really usefull.

Main problem I found with the tool: it is not possible on a MAC to open the firmware file to load. Other functions are accessible. On W7 it is possible to flash the device :


  • Connect the device with bootloader mode check activated
  • Select the firmware hex file
  • Select 19200 bps as for speed
  • Clic … sometime it is short (and not working) sometime it is longer and working
  • At end, execute a hard reset and search for the module it should appear.

Actually on May 1st 2016 the current firmware version is 1.0.1 you can get it following this link. This version is the one validated for network operators like Objenious.

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Use cflash tool to upgrade Telecom Design Firmware

In the Telecom Design SDK, you have a cflash tool you can use to reflash your firmware from a serial port. This can be usefull to reflash a TD chip from another chip of from an embedded platform like a RaspberryPI.

This peace of code is not really nicely documented, so to avoid spending to many tries, here is the result of my investigations

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