Browsing All posts tagged under »internet of things«

My Maker Faire Rome 2016

October 30, 2016

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Two weeks ago I visited the 2016 edition of the European Maker Faire in Rome. The Rome fair can be reached easily with the train that goes between Rome center (mostly Tiburtina station) and the airport of Fiumicino. The whole fair has ten pavilions, and the Maker Faire managed to fill six of them with all […]

Simple time synchronization for the Internet of Things

February 18, 2016

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While adding HTTPS capabilities to my STM32 Nucleo board, I needed to solve the problem of current time. This is because TLS needs to check certificate expiration date, so we need a sufficiently accurate estimation of time. So I tried to understand what could I do to ask a network server about the time. I […]

HTTPS client on STM32 Nucleo-F411RE

February 4, 2016

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One of my goal of the past months was to use an STM32 Nucleo board to get a webpage through HTTPS, using an Ethernet shield for TCP/IP stack. I was close last time, but I discovered that my Nucleo-F103RB did not have enough RAM. Now I have my hands on a Nucleo-F411RE that has 128KiB of RAM […]

STM32 NUCLEO-F103RB has low resources for TLS 1.2

January 10, 2016

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It’s been months since I started playing with a STM32 Nucleo + Ethernet shield. One of the objectives that I chase is to build a device for the Internet of Things that implement reasonably secure communications. In an effort to avoid reinventing the wheel (or at least to not reinvent too many wheels) I wanted to see if […]

Update on POSIX socket library for W5100: client and server for TCP or UDP

November 22, 2015

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I am writing a library that implements POSIX sockets, also called Berkeley sockets, for my ST Nucleo+Ethernet shield setup. The functionality that is currently in place, as for the source code on GitHub, allows for TCP client/server connections and UDP client/server communication using Wiznet W5100 chip resources. The interface is not complete, but what’s in place is taken as literally as I […]

Work in progress: POSIX socket library for W5100

October 28, 2015

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In a previous post I connected a Nucleo board with an Ethernet shield, with the SPI wired between the STM32 and the Wiznet W5100 chip. I am now in the process of writing some C tests for it on a GitHub repository, and in particular a socket library that tries to conform to POSIX specifications. At this […]

Sticky Bits » Security and Connected Devices

September 14, 2015

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A clickbait headline for this article would be something like: “The 10 secrets to save your next IoT product from cyber attacks” The author makes valid points, enumerates powerful real-life examples when things actually went wrong, and shows the mindset to apply when thinking about security in general. With the Internet of Things, we are seeing more and more […]